OSCL-LXR linux-6.0.1/​drivers/​net/​phy/​phy_device.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0+
 /* Framework for finding and configuring PHYs.
  * Also contains generic PHY driver
  *
  * Author: Andy Fleming
  *
  * Copyright (c) 2004 Freescale Semiconductor, Inc.
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/acpi.h>
 #include <linux/bitmap.h>
 #include <linux/delay.h>
 #include <linux/errno.h>
 #include <linux/etherdevice.h>
 #include <linux/ethtool.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/mdio.h>
 #include <linux/mii.h>
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/netdevice.h>
 #include <linux/phy.h>
 #include <linux/phy_led_triggers.h>
 #include <linux/property.h>
 #include <linux/sfp.h>
 #include <linux/skbuff.h>
 #include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/uaccess.h>
 #include <linux/unistd.h>
 
 MODULE_DESCRIPTION("PHY library");
 MODULE_AUTHOR("Andy Fleming");
 MODULE_LICENSE("GPL");
 
 __ETHTOOL_DECLARE_LINK_MODE_MASK(phy_basic_features) __ro_after_init;
 EXPORT_SYMBOL_GPL(phy_basic_features);
 
 __ETHTOOL_DECLARE_LINK_MODE_MASK(phy_basic_t1_features) __ro_after_init;
 EXPORT_SYMBOL_GPL(phy_basic_t1_features);
 
 __ETHTOOL_DECLARE_LINK_MODE_MASK(phy_gbit_features) __ro_after_init;
 EXPORT_SYMBOL_GPL(phy_gbit_features);
 
 __ETHTOOL_DECLARE_LINK_MODE_MASK(phy_gbit_fibre_features) __ro_after_init;
 EXPORT_SYMBOL_GPL(phy_gbit_fibre_features);
 
 __ETHTOOL_DECLARE_LINK_MODE_MASK(phy_gbit_all_ports_features) __ro_after_init;
 EXPORT_SYMBOL_GPL(phy_gbit_all_ports_features);
 
 __ETHTOOL_DECLARE_LINK_MODE_MASK(phy_10gbit_features) __ro_after_init;
 EXPORT_SYMBOL_GPL(phy_10gbit_features);
 
 __ETHTOOL_DECLARE_LINK_MODE_MASK(phy_10gbit_fec_features) __ro_after_init;
 EXPORT_SYMBOL_GPL(phy_10gbit_fec_features);
 
 const int phy_basic_ports_array[3] = {
     ETHTOOL_LINK_MODE_Autoneg_BIT,
     ETHTOOL_LINK_MODE_TP_BIT,
     ETHTOOL_LINK_MODE_MII_BIT,
 };
 EXPORT_SYMBOL_GPL(phy_basic_ports_array);
 
 const int phy_fibre_port_array[1] = {
     ETHTOOL_LINK_MODE_FIBRE_BIT,
 };
 EXPORT_SYMBOL_GPL(phy_fibre_port_array);
 
 const int phy_all_ports_features_array[7] = {
     ETHTOOL_LINK_MODE_Autoneg_BIT,
     ETHTOOL_LINK_MODE_TP_BIT,
     ETHTOOL_LINK_MODE_MII_BIT,
     ETHTOOL_LINK_MODE_FIBRE_BIT,
     ETHTOOL_LINK_MODE_AUI_BIT,
     ETHTOOL_LINK_MODE_BNC_BIT,
     ETHTOOL_LINK_MODE_Backplane_BIT,
 };
 EXPORT_SYMBOL_GPL(phy_all_ports_features_array);
 
 const int phy_10_100_features_array[4] = {
     ETHTOOL_LINK_MODE_10baseT_Half_BIT,
     ETHTOOL_LINK_MODE_10baseT_Full_BIT,
     ETHTOOL_LINK_MODE_100baseT_Half_BIT,
     ETHTOOL_LINK_MODE_100baseT_Full_BIT,
 };
 EXPORT_SYMBOL_GPL(phy_10_100_features_array);
 
 const int phy_basic_t1_features_array[3] = {
     ETHTOOL_LINK_MODE_TP_BIT,
     ETHTOOL_LINK_MODE_10baseT1L_Full_BIT,
     ETHTOOL_LINK_MODE_100baseT1_Full_BIT,
 };
 EXPORT_SYMBOL_GPL(phy_basic_t1_features_array);
 
 const int phy_gbit_features_array[2] = {
     ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
     ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
 };
 EXPORT_SYMBOL_GPL(phy_gbit_features_array);
 
 const int phy_10gbit_features_array[1] = {
     ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
 };
 EXPORT_SYMBOL_GPL(phy_10gbit_features_array);
 
 static const int phy_10gbit_fec_features_array[1] = {
     ETHTOOL_LINK_MODE_10000baseR_FEC_BIT,
 };
 
 __ETHTOOL_DECLARE_LINK_MODE_MASK(phy_10gbit_full_features) __ro_after_init;
 EXPORT_SYMBOL_GPL(phy_10gbit_full_features);
 
 static const int phy_10gbit_full_features_array[] = {
     ETHTOOL_LINK_MODE_10baseT_Full_BIT,
     ETHTOOL_LINK_MODE_100baseT_Full_BIT,
     ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
     ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
 };
 
 static void features_init(void)
 {
     /* 10/100 half/full*/
     linkmode_set_bit_array(phy_basic_ports_array,
                    ARRAY_SIZE(phy_basic_ports_array),
                    phy_basic_features);
     linkmode_set_bit_array(phy_10_100_features_array,
                    ARRAY_SIZE(phy_10_100_features_array),
                    phy_basic_features);
 
     /* 100 full, TP */
     linkmode_set_bit_array(phy_basic_t1_features_array,
                    ARRAY_SIZE(phy_basic_t1_features_array),
                    phy_basic_t1_features);
 
     /* 10/100 half/full + 1000 half/full */
     linkmode_set_bit_array(phy_basic_ports_array,
                    ARRAY_SIZE(phy_basic_ports_array),
                    phy_gbit_features);
     linkmode_set_bit_array(phy_10_100_features_array,
                    ARRAY_SIZE(phy_10_100_features_array),
                    phy_gbit_features);
     linkmode_set_bit_array(phy_gbit_features_array,
                    ARRAY_SIZE(phy_gbit_features_array),
                    phy_gbit_features);
 
     /* 10/100 half/full + 1000 half/full + fibre*/
     linkmode_set_bit_array(phy_basic_ports_array,
                    ARRAY_SIZE(phy_basic_ports_array),
                    phy_gbit_fibre_features);
     linkmode_set_bit_array(phy_10_100_features_array,
                    ARRAY_SIZE(phy_10_100_features_array),
                    phy_gbit_fibre_features);
     linkmode_set_bit_array(phy_gbit_features_array,
                    ARRAY_SIZE(phy_gbit_features_array),
                    phy_gbit_fibre_features);
     linkmode_set_bit_array(phy_fibre_port_array,
                    ARRAY_SIZE(phy_fibre_port_array),
                    phy_gbit_fibre_features);
 
     /* 10/100 half/full + 1000 half/full + TP/MII/FIBRE/AUI/BNC/Backplane*/
     linkmode_set_bit_array(phy_all_ports_features_array,
                    ARRAY_SIZE(phy_all_ports_features_array),
                    phy_gbit_all_ports_features);
     linkmode_set_bit_array(phy_10_100_features_array,
                    ARRAY_SIZE(phy_10_100_features_array),
                    phy_gbit_all_ports_features);
     linkmode_set_bit_array(phy_gbit_features_array,
                    ARRAY_SIZE(phy_gbit_features_array),
                    phy_gbit_all_ports_features);
 
     /* 10/100 half/full + 1000 half/full + 10G full*/
     linkmode_set_bit_array(phy_all_ports_features_array,
                    ARRAY_SIZE(phy_all_ports_features_array),
                    phy_10gbit_features);
     linkmode_set_bit_array(phy_10_100_features_array,
                    ARRAY_SIZE(phy_10_100_features_array),
                    phy_10gbit_features);
     linkmode_set_bit_array(phy_gbit_features_array,
                    ARRAY_SIZE(phy_gbit_features_array),
                    phy_10gbit_features);
     linkmode_set_bit_array(phy_10gbit_features_array,
                    ARRAY_SIZE(phy_10gbit_features_array),
                    phy_10gbit_features);
 
     /* 10/100/1000/10G full */
     linkmode_set_bit_array(phy_all_ports_features_array,
                    ARRAY_SIZE(phy_all_ports_features_array),
                    phy_10gbit_full_features);
     linkmode_set_bit_array(phy_10gbit_full_features_array,
                    ARRAY_SIZE(phy_10gbit_full_features_array),
                    phy_10gbit_full_features);
     /* 10G FEC only */
     linkmode_set_bit_array(phy_10gbit_fec_features_array,
                    ARRAY_SIZE(phy_10gbit_fec_features_array),
                    phy_10gbit_fec_features);
 }
 
 void phy_device_free(struct phy_device *phydev)
 {
     put_device(&phydev->mdio.dev);
 }
 EXPORT_SYMBOL(phy_device_free);
 
 static void phy_mdio_device_free(struct mdio_device *mdiodev)
 {
     struct phy_device *phydev;
 
     phydev = container_of(mdiodev, struct phy_device, mdio);
     phy_device_free(phydev);
 }
 
 static void phy_device_release(struct device *dev)
 {
     kfree(to_phy_device(dev));
 }
 
 static void phy_mdio_device_remove(struct mdio_device *mdiodev)
 {
     struct phy_device *phydev;
 
     phydev = container_of(mdiodev, struct phy_device, mdio);
     phy_device_remove(phydev);
 }
 
 static struct phy_driver genphy_driver;
 
 static LIST_HEAD(phy_fixup_list);
 static DEFINE_MUTEX(phy_fixup_lock);
 
 static bool mdio_bus_phy_may_suspend(struct phy_device *phydev)
 {
     struct device_driver *drv = phydev->mdio.dev.driver;
     struct phy_driver *phydrv = to_phy_driver(drv);
     struct net_device *netdev = phydev->attached_dev;
 
     if (!drv || !phydrv->suspend)
         return false;
 
     /* PHY not attached? May suspend if the PHY has not already been
      * suspended as part of a prior call to phy_disconnect() ->
      * phy_detach() -> phy_suspend() because the parent netdev might be the
      * MDIO bus driver and clock gated at this point.
      */
     if (!netdev)
         goto out;
 
     if (netdev->wol_enabled)
         return false;
 
     /* As long as not all affected network drivers support the
      * wol_enabled flag, let's check for hints that WoL is enabled.
      * Don't suspend PHY if the attached netdev parent may wake up.
      * The parent may point to a PCI device, as in tg3 driver.
      */
     if (netdev->dev.parent && device_may_wakeup(netdev->dev.parent))
         return false;
 
     /* Also don't suspend PHY if the netdev itself may wakeup. This
      * is the case for devices w/o underlaying pwr. mgmt. aware bus,
      * e.g. SoC devices.
      */
     if (device_may_wakeup(&netdev->dev))
         return false;
 
 out:
     return !phydev->suspended;
 }
 
 static __maybe_unused int mdio_bus_phy_suspend(struct device *dev)
 {
     struct phy_device *phydev = to_phy_device(dev);
 
     if (phydev->mac_managed_pm)
         return 0;
 
     /* Wakeup interrupts may occur during the system sleep transition when
      * the PHY is inaccessible. Set flag to postpone handling until the PHY
      * has resumed. Wait for concurrent interrupt handler to complete.
      */
     if (phy_interrupt_is_valid(phydev)) {
         phydev->irq_suspended = 1;
         synchronize_irq(phydev->irq);
     }
 
     /* We must stop the state machine manually, otherwise it stops out of
      * control, possibly with the phydev->lock held. Upon resume, netdev
      * may call phy routines that try to grab the same lock, and that may
      * lead to a deadlock.
      */
     if (phydev->attached_dev && phydev->adjust_link)
         phy_stop_machine(phydev);
 
     if (!mdio_bus_phy_may_suspend(phydev))
         return 0;
 
     phydev->suspended_by_mdio_bus = 1;
 
     return phy_suspend(phydev);
 }
 
 static __maybe_unused int mdio_bus_phy_resume(struct device *dev)
 {
     struct phy_device *phydev = to_phy_device(dev);
     int ret;
 
     if (phydev->mac_managed_pm)
         return 0;
 
     if (!phydev->suspended_by_mdio_bus)
         goto no_resume;
 
     phydev->suspended_by_mdio_bus = 0;
 
     /* If we managed to get here with the PHY state machine in a state
      * neither PHY_HALTED, PHY_READY nor PHY_UP, this is an indication
      * that something went wrong and we should most likely be using
      * MAC managed PM, but we are not.
      */
     WARN_ON(phydev->state != PHY_HALTED && phydev->state != PHY_READY &&
         phydev->state != PHY_UP);
 
     ret = phy_init_hw(phydev);
     if (ret < 0)
         return ret;
 
     ret = phy_resume(phydev);
     if (ret < 0)
         return ret;
 no_resume:
     if (phy_interrupt_is_valid(phydev)) {
         phydev->irq_suspended = 0;
         synchronize_irq(phydev->irq);
 
         /* Rerun interrupts which were postponed by phy_interrupt()
          * because they occurred during the system sleep transition.
          */
         if (phydev->irq_rerun) {
             phydev->irq_rerun = 0;
             enable_irq(phydev->irq);
             irq_wake_thread(phydev->irq, phydev);
         }
     }
 
     if (phydev->attached_dev && phydev->adjust_link)
         phy_start_machine(phydev);
 
     return 0;
 }
 
 static SIMPLE_DEV_PM_OPS(mdio_bus_phy_pm_ops, mdio_bus_phy_suspend,
              mdio_bus_phy_resume);
 
 /**
  * phy_register_fixup - creates a new phy_fixup and adds it to the list
  * @bus_id: A string which matches phydev->mdio.dev.bus_id (or PHY_ANY_ID)
  * @phy_uid: Used to match against phydev->phy_id (the UID of the PHY)
  *  It can also be PHY_ANY_UID
  * @phy_uid_mask: Applied to phydev->phy_id and fixup->phy_uid before
  *  comparison
  * @run: The actual code to be run when a matching PHY is found
  */
 int phy_register_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask,
                int (*run)(struct phy_device *))
 {
     struct phy_fixup *fixup = kzalloc(sizeof(*fixup), GFP_KERNEL);
 
     if (!fixup)
         return -ENOMEM;
 
     strlcpy(fixup->bus_id, bus_id, sizeof(fixup->bus_id));
     fixup->phy_uid = phy_uid;
     fixup->phy_uid_mask = phy_uid_mask;
     fixup->run = run;
 
     mutex_lock(&phy_fixup_lock);
     list_add_tail(&fixup->list, &phy_fixup_list);
     mutex_unlock(&phy_fixup_lock);
 
     return 0;
 }
 EXPORT_SYMBOL(phy_register_fixup);
 
 /* Registers a fixup to be run on any PHY with the UID in phy_uid */
 int phy_register_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask,
                    int (*run)(struct phy_device *))
 {
     return phy_register_fixup(PHY_ANY_ID, phy_uid, phy_uid_mask, run);
 }
 EXPORT_SYMBOL(phy_register_fixup_for_uid);
 
 /* Registers a fixup to be run on the PHY with id string bus_id */
 int phy_register_fixup_for_id(const char *bus_id,
                   int (*run)(struct phy_device *))
 {
     return phy_register_fixup(bus_id, PHY_ANY_UID, 0xffffffff, run);
 }
 EXPORT_SYMBOL(phy_register_fixup_for_id);
 
 /**
  * phy_unregister_fixup - remove a phy_fixup from the list
  * @bus_id: A string matches fixup->bus_id (or PHY_ANY_ID) in phy_fixup_list
  * @phy_uid: A phy id matches fixup->phy_id (or PHY_ANY_UID) in phy_fixup_list
  * @phy_uid_mask: Applied to phy_uid and fixup->phy_uid before comparison
  */
 int phy_unregister_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask)
 {
     struct list_head *pos, *n;
     struct phy_fixup *fixup;
     int ret;
 
     ret = -ENODEV;
 
     mutex_lock(&phy_fixup_lock);
     list_for_each_safe(pos, n, &phy_fixup_list) {
         fixup = list_entry(pos, struct phy_fixup, list);
 
         if ((!strcmp(fixup->bus_id, bus_id)) &&
             ((fixup->phy_uid & phy_uid_mask) ==
              (phy_uid & phy_uid_mask))) {
             list_del(&fixup->list);
             kfree(fixup);
             ret = 0;
             break;
         }
     }
     mutex_unlock(&phy_fixup_lock);
 
     return ret;
 }
 EXPORT_SYMBOL(phy_unregister_fixup);
 
 /* Unregisters a fixup of any PHY with the UID in phy_uid */
 int phy_unregister_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask)
 {
     return phy_unregister_fixup(PHY_ANY_ID, phy_uid, phy_uid_mask);
 }
 EXPORT_SYMBOL(phy_unregister_fixup_for_uid);
 
 /* Unregisters a fixup of the PHY with id string bus_id */
 int phy_unregister_fixup_for_id(const char *bus_id)
 {
     return phy_unregister_fixup(bus_id, PHY_ANY_UID, 0xffffffff);
 }
 EXPORT_SYMBOL(phy_unregister_fixup_for_id);
 
 /* Returns 1 if fixup matches phydev in bus_id and phy_uid.
  * Fixups can be set to match any in one or more fields.
  */
 static int phy_needs_fixup(struct phy_device *phydev, struct phy_fixup *fixup)
 {
     if (strcmp(fixup->bus_id, phydev_name(phydev)) != 0)
         if (strcmp(fixup->bus_id, PHY_ANY_ID) != 0)
             return 0;
 
     if ((fixup->phy_uid & fixup->phy_uid_mask) !=
         (phydev->phy_id & fixup->phy_uid_mask))
         if (fixup->phy_uid != PHY_ANY_UID)
             return 0;
 
     return 1;
 }
 
 /* Runs any matching fixups for this phydev */
 static int phy_scan_fixups(struct phy_device *phydev)
 {
     struct phy_fixup *fixup;
 
     mutex_lock(&phy_fixup_lock);
     list_for_each_entry(fixup, &phy_fixup_list, list) {
         if (phy_needs_fixup(phydev, fixup)) {
             int err = fixup->run(phydev);
 
             if (err < 0) {
                 mutex_unlock(&phy_fixup_lock);
                 return err;
             }
             phydev->has_fixups = true;
         }
     }
     mutex_unlock(&phy_fixup_lock);
 
     return 0;
 }
 
 static int phy_bus_match(struct device *dev, struct device_driver *drv)
 {
     struct phy_device *phydev = to_phy_device(dev);
     struct phy_driver *phydrv = to_phy_driver(drv);
     const int num_ids = ARRAY_SIZE(phydev->c45_ids.device_ids);
     int i;
 
     if (!(phydrv->mdiodrv.flags & MDIO_DEVICE_IS_PHY))
         return 0;
 
     if (phydrv->match_phy_device)
         return phydrv->match_phy_device(phydev);
 
     if (phydev->is_c45) {
         for (i = 1; i < num_ids; i++) {
             if (phydev->c45_ids.device_ids[i] == 0xffffffff)
                 continue;
 
             if ((phydrv->phy_id & phydrv->phy_id_mask) ==
                 (phydev->c45_ids.device_ids[i] &
                  phydrv->phy_id_mask))
                 return 1;
         }
         return 0;
     } else {
         return (phydrv->phy_id & phydrv->phy_id_mask) ==
             (phydev->phy_id & phydrv->phy_id_mask);
     }
 }
 
 static ssize_t
 phy_id_show(struct device *dev, struct device_attribute *attr, char *buf)
 {
     struct phy_device *phydev = to_phy_device(dev);
 
     return sprintf(buf, "0x%.8lx\n", (unsigned long)phydev->phy_id);
 }
 static DEVICE_ATTR_RO(phy_id);
 
 static ssize_t
 phy_interface_show(struct device *dev, struct device_attribute *attr, char *buf)
 {
     struct phy_device *phydev = to_phy_device(dev);
     const char *mode = NULL;
 
     if (phy_is_internal(phydev))
         mode = "internal";
     else
         mode = phy_modes(phydev->interface);
 
     return sprintf(buf, "%s\n", mode);
 }
 static DEVICE_ATTR_RO(phy_interface);
 
 static ssize_t
 phy_has_fixups_show(struct device *dev, struct device_attribute *attr,
             char *buf)
 {
     struct phy_device *phydev = to_phy_device(dev);
 
     return sprintf(buf, "%d\n", phydev->has_fixups);
 }
 static DEVICE_ATTR_RO(phy_has_fixups);
 
 static ssize_t phy_dev_flags_show(struct device *dev,
                   struct device_attribute *attr,
                   char *buf)
 {
     struct phy_device *phydev = to_phy_device(dev);
 
     return sprintf(buf, "0x%08x\n", phydev->dev_flags);
 }
 static DEVICE_ATTR_RO(phy_dev_flags);
 
 static struct attribute *phy_dev_attrs[] = {
     &dev_attr_phy_id.attr,
     &dev_attr_phy_interface.attr,
     &dev_attr_phy_has_fixups.attr,
     &dev_attr_phy_dev_flags.attr,
     NULL,
 };
 ATTRIBUTE_GROUPS(phy_dev);
 
 static const struct device_type mdio_bus_phy_type = {
     .name = "PHY",
     .groups = phy_dev_groups,
     .release = phy_device_release,
     .pm = pm_ptr(&mdio_bus_phy_pm_ops),
 };
 
 static int phy_request_driver_module(struct phy_device *dev, u32 phy_id)
 {
     int ret;
 
     ret = request_module(MDIO_MODULE_PREFIX MDIO_ID_FMT,
                  MDIO_ID_ARGS(phy_id));
     /* We only check for failures in executing the usermode binary,
      * not whether a PHY driver module exists for the PHY ID.
      * Accept -ENOENT because this may occur in case no initramfs exists,
      * then modprobe isn't available.
      */
     if (IS_ENABLED(CONFIG_MODULES) && ret < 0 && ret != -ENOENT) {
         phydev_err(dev, "error %d loading PHY driver module for ID 0x%08lx\n",
                ret, (unsigned long)phy_id);
         return ret;
     }
 
     return 0;
 }
 
 struct phy_device *phy_device_create(struct mii_bus *bus, int addr, u32 phy_id,
                      bool is_c45,
                      struct phy_c45_device_ids *c45_ids)
 {
     struct phy_device *dev;
     struct mdio_device *mdiodev;
     int ret = 0;
 
     /* We allocate the device, and initialize the default values */
     dev = kzalloc(sizeof(*dev), GFP_KERNEL);
     if (!dev)
         return ERR_PTR(-ENOMEM);
 
     mdiodev = &dev->mdio;
     mdiodev->dev.parent = &bus->dev;
     mdiodev->dev.bus = &mdio_bus_type;
     mdiodev->dev.type = &mdio_bus_phy_type;
     mdiodev->bus = bus;
     mdiodev->bus_match = phy_bus_match;
     mdiodev->addr = addr;
     mdiodev->flags = MDIO_DEVICE_FLAG_PHY;
     mdiodev->device_free = phy_mdio_device_free;
     mdiodev->device_remove = phy_mdio_device_remove;
 
     dev->speed = SPEED_UNKNOWN;
     dev->duplex = DUPLEX_UNKNOWN;
     dev->pause = 0;
     dev->asym_pause = 0;
     dev->link = 0;
     dev->port = PORT_TP;
     dev->interface = PHY_INTERFACE_MODE_GMII;
 
     dev->autoneg = AUTONEG_ENABLE;
 
     dev->pma_extable = -ENODATA;
     dev->is_c45 = is_c45;
     dev->phy_id = phy_id;
     if (c45_ids)
         dev->c45_ids = *c45_ids;
     dev->irq = bus->irq[addr];
 
     dev_set_name(&mdiodev->dev, PHY_ID_FMT, bus->id, addr);
     device_initialize(&mdiodev->dev);
 
     dev->state = PHY_DOWN;
 
     mutex_init(&dev->lock);
     INIT_DELAYED_WORK(&dev->state_queue, phy_state_machine);
 
     /* Request the appropriate module unconditionally; don't
      * bother trying to do so only if it isn't already loaded,
      * because that gets complicated. A hotplug event would have
      * done an unconditional modprobe anyway.
      * We don't do normal hotplug because it won't work for MDIO
      * -- because it relies on the device staying around for long
      * enough for the driver to get loaded. With MDIO, the NIC
      * driver will get bored and give up as soon as it finds that
      * there's no driver _already_ loaded.
      */
     if (is_c45 && c45_ids) {
         const int num_ids = ARRAY_SIZE(c45_ids->device_ids);
         int i;
 
         for (i = 1; i < num_ids; i++) {
             if (c45_ids->device_ids[i] == 0xffffffff)
                 continue;
 
             ret = phy_request_driver_module(dev,
                         c45_ids->device_ids[i]);
             if (ret)
                 break;
         }
     } else {
         ret = phy_request_driver_module(dev, phy_id);
     }
 
     if (ret) {
         put_device(&mdiodev->dev);
         dev = ERR_PTR(ret);
     }
 
     return dev;
 }
 EXPORT_SYMBOL(phy_device_create);
 
 /* phy_c45_probe_present - checks to see if a MMD is present in the package
  * @bus: the target MII bus
  * @prtad: PHY package address on the MII bus
  * @devad: PHY device (MMD) address
  *
  * Read the MDIO_STAT2 register, and check whether a device is responding
  * at this address.
  *
  * Returns: negative error number on bus access error, zero if no device
  * is responding, or positive if a device is present.
  */
 static int phy_c45_probe_present(struct mii_bus *bus, int prtad, int devad)
 {
     int stat2;
 
     stat2 = mdiobus_c45_read(bus, prtad, devad, MDIO_STAT2);
     if (stat2 < 0)
         return stat2;
 
     return (stat2 & MDIO_STAT2_DEVPRST) == MDIO_STAT2_DEVPRST_VAL;
 }
 
 /* get_phy_c45_devs_in_pkg - reads a MMD's devices in package registers.
  * @bus: the target MII bus
  * @addr: PHY address on the MII bus
  * @dev_addr: MMD address in the PHY.
  * @devices_in_package: where to store the devices in package information.
  *
  * Description: reads devices in package registers of a MMD at @dev_addr
  * from PHY at @addr on @bus.
  *
  * Returns: 0 on success, -EIO on failure.
  */
 static int get_phy_c45_devs_in_pkg(struct mii_bus *bus, int addr, int dev_addr,
                    u32 *devices_in_package)
 {
     int phy_reg;
 
     phy_reg = mdiobus_c45_read(bus, addr, dev_addr, MDIO_DEVS2);
     if (phy_reg < 0)
         return -EIO;
     *devices_in_package = phy_reg << 16;
 
     phy_reg = mdiobus_c45_read(bus, addr, dev_addr, MDIO_DEVS1);
     if (phy_reg < 0)
         return -EIO;
     *devices_in_package |= phy_reg;
 
     return 0;
 }
 
 /**
  * get_phy_c45_ids - reads the specified addr for its 802.3-c45 IDs.
  * @bus: the target MII bus
  * @addr: PHY address on the MII bus
  * @c45_ids: where to store the c45 ID information.
  *
  * Read the PHY "devices in package". If this appears to be valid, read
  * the PHY identifiers for each device. Return the "devices in package"
  * and identifiers in @c45_ids.
  *
  * Returns zero on success, %-EIO on bus access error, or %-ENODEV if
  * the "devices in package" is invalid.
  */
 static int get_phy_c45_ids(struct mii_bus *bus, int addr,
                struct phy_c45_device_ids *c45_ids)
 {
     const int num_ids = ARRAY_SIZE(c45_ids->device_ids);
     u32 devs_in_pkg = 0;
     int i, ret, phy_reg;
 
     /* Find first non-zero Devices In package. Device zero is reserved
      * for 802.3 c45 complied PHYs, so don't probe it at first.
      */
     for (i = 1; i < MDIO_MMD_NUM && (devs_in_pkg == 0 ||
          (devs_in_pkg & 0x1fffffff) == 0x1fffffff); i++) {
         if (i == MDIO_MMD_VEND1 || i == MDIO_MMD_VEND2) {
             /* Check that there is a device present at this
              * address before reading the devices-in-package
              * register to avoid reading garbage from the PHY.
              * Some PHYs (88x3310) vendor space is not IEEE802.3
              * compliant.
              */
             ret = phy_c45_probe_present(bus, addr, i);
             if (ret < 0)
                 return -EIO;
 
             if (!ret)
                 continue;
         }
         phy_reg = get_phy_c45_devs_in_pkg(bus, addr, i, &devs_in_pkg);
         if (phy_reg < 0)
             return -EIO;
     }
 
     if ((devs_in_pkg & 0x1fffffff) == 0x1fffffff) {
         /* If mostly Fs, there is no device there, then let's probe
          * MMD 0, as some 10G PHYs have zero Devices In package,
          * e.g. Cortina CS4315/CS4340 PHY.
          */
         phy_reg = get_phy_c45_devs_in_pkg(bus, addr, 0, &devs_in_pkg);
         if (phy_reg < 0)
             return -EIO;
 
         /* no device there, let's get out of here */
         if ((devs_in_pkg & 0x1fffffff) == 0x1fffffff)
             return -ENODEV;
     }
 
     /* Now probe Device Identifiers for each device present. */
     for (i = 1; i < num_ids; i++) {
         if (!(devs_in_pkg & (1 << i)))
             continue;
 
         if (i == MDIO_MMD_VEND1 || i == MDIO_MMD_VEND2) {
             /* Probe the "Device Present" bits for the vendor MMDs
              * to ignore these if they do not contain IEEE 802.3
              * registers.
              */
             ret = phy_c45_probe_present(bus, addr, i);
             if (ret < 0)
                 return ret;
 
             if (!ret)
                 continue;
         }
 
         phy_reg = mdiobus_c45_read(bus, addr, i, MII_PHYSID1);
         if (phy_reg < 0)
             return -EIO;
         c45_ids->device_ids[i] = phy_reg << 16;
 
         phy_reg = mdiobus_c45_read(bus, addr, i, MII_PHYSID2);
         if (phy_reg < 0)
             return -EIO;
         c45_ids->device_ids[i] |= phy_reg;
     }
 
     c45_ids->devices_in_package = devs_in_pkg;
     /* Bit 0 doesn't represent a device, it indicates c22 regs presence */
     c45_ids->mmds_present = devs_in_pkg & ~BIT(0);
 
     return 0;
 }
 
 /**
  * get_phy_c22_id - reads the specified addr for its clause 22 ID.
  * @bus: the target MII bus
  * @addr: PHY address on the MII bus
  * @phy_id: where to store the ID retrieved.
  *
  * Read the 802.3 clause 22 PHY ID from the PHY at @addr on the @bus,
  * placing it in @phy_id. Return zero on successful read and the ID is
  * valid, %-EIO on bus access error, or %-ENODEV if no device responds
  * or invalid ID.
  */
 static int get_phy_c22_id(struct mii_bus *bus, int addr, u32 *phy_id)
 {
     int phy_reg;
 
     /* Grab the bits from PHYIR1, and put them in the upper half */
     phy_reg = mdiobus_read(bus, addr, MII_PHYSID1);
     if (phy_reg < 0) {
         /* returning -ENODEV doesn't stop bus scanning */
         return (phy_reg == -EIO || phy_reg == -ENODEV) ? -ENODEV : -EIO;
     }
 
     *phy_id = phy_reg << 16;
 
     /* Grab the bits from PHYIR2, and put them in the lower half */
     phy_reg = mdiobus_read(bus, addr, MII_PHYSID2);
     if (phy_reg < 0) {
         /* returning -ENODEV doesn't stop bus scanning */
         return (phy_reg == -EIO || phy_reg == -ENODEV) ? -ENODEV : -EIO;
     }
 
     *phy_id |= phy_reg;
 
     /* If the phy_id is mostly Fs, there is no device there */
     if ((*phy_id & 0x1fffffff) == 0x1fffffff)
         return -ENODEV;
 
     return 0;
 }
 
 /* Extract the phy ID from the compatible string of the form
  * ethernet-phy-idAAAA.BBBB.
  */
 int fwnode_get_phy_id(struct fwnode_handle *fwnode, u32 *phy_id)
 {
     unsigned int upper, lower;
     const char *cp;
     int ret;
 
     ret = fwnode_property_read_string(fwnode, "compatible", &cp);
     if (ret)
         return ret;
 
     if (sscanf(cp, "ethernet-phy-id%4x.%4x", &upper, &lower) != 2)
         return -EINVAL;
 
     *phy_id = ((upper & GENMASK(15, 0)) << 16) | (lower & GENMASK(15, 0));
     return 0;
 }
 EXPORT_SYMBOL(fwnode_get_phy_id);
 
 /**
  * get_phy_device - reads the specified PHY device and returns its @phy_device
  *          struct
  * @bus: the target MII bus
  * @addr: PHY address on the MII bus
  * @is_c45: If true the PHY uses the 802.3 clause 45 protocol
  *
  * Probe for a PHY at @addr on @bus.
  *
  * When probing for a clause 22 PHY, then read the ID registers. If we find
  * a valid ID, allocate and return a &struct phy_device.
  *
  * When probing for a clause 45 PHY, read the "devices in package" registers.
  * If the "devices in package" appears valid, read the ID registers for each
  * MMD, allocate and return a &struct phy_device.
  *
  * Returns an allocated &struct phy_device on success, %-ENODEV if there is
  * no PHY present, or %-EIO on bus access error.
  */
 struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45)
 {
     struct phy_c45_device_ids c45_ids;
     u32 phy_id = 0;
     int r;
 
     c45_ids.devices_in_package = 0;
     c45_ids.mmds_present = 0;
     memset(c45_ids.device_ids, 0xff, sizeof(c45_ids.device_ids));
 
     if (is_c45)
         r = get_phy_c45_ids(bus, addr, &c45_ids);
     else
         r = get_phy_c22_id(bus, addr, &phy_id);
 
     if (r)
         return ERR_PTR(r);
 
     /* PHY device such as the Marvell Alaska 88E2110 will return a PHY ID
      * of 0 when probed using get_phy_c22_id() with no error. Proceed to
      * probe with C45 to see if we're able to get a valid PHY ID in the C45
      * space, if successful, create the C45 PHY device.
      */
     if (!is_c45 && phy_id == 0 && bus->probe_capabilities >= MDIOBUS_C45) {
         r = get_phy_c45_ids(bus, addr, &c45_ids);
         if (!r)
             return phy_device_create(bus, addr, phy_id,
                          true, &c45_ids);
     }
 
     return phy_device_create(bus, addr, phy_id, is_c45, &c45_ids);
 }
 EXPORT_SYMBOL(get_phy_device);
 
 /**
  * phy_device_register - Register the phy device on the MDIO bus
  * @phydev: phy_device structure to be added to the MDIO bus
  */
 int phy_device_register(struct phy_device *phydev)
 {
     int err;
 
     err = mdiobus_register_device(&phydev->mdio);
     if (err)
         return err;
 
     /* Deassert the reset signal */
     phy_device_reset(phydev, 0);
 
     /* Run all of the fixups for this PHY */
     err = phy_scan_fixups(phydev);
     if (err) {
         phydev_err(phydev, "failed to initialize\n");
         goto out;
     }
 
     err = device_add(&phydev->mdio.dev);
     if (err) {
         phydev_err(phydev, "failed to add\n");
         goto out;
     }
 
     return 0;
 
  out:
     /* Assert the reset signal */
     phy_device_reset(phydev, 1);
 
     mdiobus_unregister_device(&phydev->mdio);
     return err;
 }
 EXPORT_SYMBOL(phy_device_register);
 
 /**
  * phy_device_remove - Remove a previously registered phy device from the MDIO bus
  * @phydev: phy_device structure to remove
  *
  * This doesn't free the phy_device itself, it merely reverses the effects
  * of phy_device_register(). Use phy_device_free() to free the device
  * after calling this function.
  */
 void phy_device_remove(struct phy_device *phydev)
 {
     unregister_mii_timestamper(phydev->mii_ts);
 
     device_del(&phydev->mdio.dev);
 
     /* Assert the reset signal */
     phy_device_reset(phydev, 1);
 
     mdiobus_unregister_device(&phydev->mdio);
 }
 EXPORT_SYMBOL(phy_device_remove);
 
 /**
  * phy_get_c45_ids - Read 802.3-c45 IDs for phy device.
  * @phydev: phy_device structure to read 802.3-c45 IDs
  *
  * Returns zero on success, %-EIO on bus access error, or %-ENODEV if
  * the "devices in package" is invalid.
  */
 int phy_get_c45_ids(struct phy_device *phydev)
 {
     return get_phy_c45_ids(phydev->mdio.bus, phydev->mdio.addr,
                    &phydev->c45_ids);
 }
 EXPORT_SYMBOL(phy_get_c45_ids);
 
 /**
  * phy_find_first - finds the first PHY device on the bus
  * @bus: the target MII bus
  */
 struct phy_device *phy_find_first(struct mii_bus *bus)
 {
     struct phy_device *phydev;
     int addr;
 
     for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
         phydev = mdiobus_get_phy(bus, addr);
         if (phydev)
             return phydev;
     }
     return NULL;
 }
 EXPORT_SYMBOL(phy_find_first);
 
 static void phy_link_change(struct phy_device *phydev, bool up)
 {
     struct net_device *netdev = phydev->attached_dev;
 
     if (up)
         netif_carrier_on(netdev);
     else
         netif_carrier_off(netdev);
     phydev->adjust_link(netdev);
     if (phydev->mii_ts && phydev->mii_ts->link_state)
         phydev->mii_ts->link_state(phydev->mii_ts, phydev);
 }
 
 /**
  * phy_prepare_link - prepares the PHY layer to monitor link status
  * @phydev: target phy_device struct
  * @handler: callback function for link status change notifications
  *
  * Description: Tells the PHY infrastructure to handle the
  *   gory details on monitoring link status (whether through
  *   polling or an interrupt), and to call back to the
  *   connected device driver when the link status changes.
  *   If you want to monitor your own link state, don't call
  *   this function.
  */
 static void phy_prepare_link(struct phy_device *phydev,
                  void (*handler)(struct net_device *))
 {
     phydev->adjust_link = handler;
 }
 
 /**
  * phy_connect_direct - connect an ethernet device to a specific phy_device
  * @dev: the network device to connect
  * @phydev: the pointer to the phy device
  * @handler: callback function for state change notifications
  * @interface: PHY device's interface
  */
 int phy_connect_direct(struct net_device *dev, struct phy_device *phydev,
                void (*handler)(struct net_device *),
                phy_interface_t interface)
 {
     int rc;
 
     if (!dev)
         return -EINVAL;
 
     rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface);
     if (rc)
         return rc;
 
     phy_prepare_link(phydev, handler);
     if (phy_interrupt_is_valid(phydev))
         phy_request_interrupt(phydev);
 
     return 0;
 }
 EXPORT_SYMBOL(phy_connect_direct);
 
 /**
  * phy_connect - connect an ethernet device to a PHY device
  * @dev: the network device to connect
  * @bus_id: the id string of the PHY device to connect
  * @handler: callback function for state change notifications
  * @interface: PHY device's interface
  *
  * Description: Convenience function for connecting ethernet
  *   devices to PHY devices.  The default behavior is for
  *   the PHY infrastructure to handle everything, and only notify
  *   the connected driver when the link status changes.  If you
  *   don't want, or can't use the provided functionality, you may
  *   choose to call only the subset of functions which provide
  *   the desired functionality.
  */
 struct phy_device *phy_connect(struct net_device *dev, const char *bus_id,
                    void (*handler)(struct net_device *),
                    phy_interface_t interface)
 {
     struct phy_device *phydev;
     struct device *d;
     int rc;
 
     /* Search the list of PHY devices on the mdio bus for the
      * PHY with the requested name
      */
     d = bus_find_device_by_name(&mdio_bus_type, NULL, bus_id);
     if (!d) {
         pr_err("PHY %s not found\n", bus_id);
         return ERR_PTR(-ENODEV);
     }
     phydev = to_phy_device(d);
 
     rc = phy_connect_direct(dev, phydev, handler, interface);
     put_device(d);
     if (rc)
         return ERR_PTR(rc);
 
     return phydev;
 }
 EXPORT_SYMBOL(phy_connect);
 
 /**
  * phy_disconnect - disable interrupts, stop state machine, and detach a PHY
  *          device
  * @phydev: target phy_device struct
  */
 void phy_disconnect(struct phy_device *phydev)
 {
     if (phy_is_started(phydev))
         phy_stop(phydev);
 
     if (phy_interrupt_is_valid(phydev))
         phy_free_interrupt(phydev);
 
     phydev->adjust_link = NULL;
 
     phy_detach(phydev);
 }
 EXPORT_SYMBOL(phy_disconnect);
 
 /**
  * phy_poll_reset - Safely wait until a PHY reset has properly completed
  * @phydev: The PHY device to poll
  *
  * Description: According to IEEE 802.3, Section 2, Subsection 22.2.4.1.1, as
  *   published in 2008, a PHY reset may take up to 0.5 seconds.  The MII BMCR
  *   register must be polled until the BMCR_RESET bit clears.
  *
  *   Furthermore, any attempts to write to PHY registers may have no effect
  *   or even generate MDIO bus errors until this is complete.
  *
  *   Some PHYs (such as the Marvell 88E1111) don't entirely conform to the
  *   standard and do not fully reset after the BMCR_RESET bit is set, and may
  *   even *REQUIRE* a soft-reset to properly restart autonegotiation.  In an
  *   effort to support such broken PHYs, this function is separate from the
  *   standard phy_init_hw() which will zero all the other bits in the BMCR
  *   and reapply all driver-specific and board-specific fixups.
  */
 static int phy_poll_reset(struct phy_device *phydev)
 {
     /* Poll until the reset bit clears (50ms per retry == 0.6 sec) */
     int ret, val;
 
     ret = phy_read_poll_timeout(phydev, MII_BMCR, val, !(val & BMCR_RESET),
                     50000, 600000, true);
     if (ret)
         return ret;
     /* Some chips (smsc911x) may still need up to another 1ms after the
      * BMCR_RESET bit is cleared before they are usable.
      */
     msleep(1);
     return 0;
 }
 
 int phy_init_hw(struct phy_device *phydev)
 {
     int ret = 0;
 
     /* Deassert the reset signal */
     phy_device_reset(phydev, 0);
 
     if (!phydev->drv)
         return 0;
 
     if (phydev->drv->soft_reset) {
         ret = phydev->drv->soft_reset(phydev);
         /* see comment in genphy_soft_reset for an explanation */
         if (!ret)
             phydev->suspended = 0;
     }
 
     if (ret < 0)
         return ret;
 
     ret = phy_scan_fixups(phydev);
     if (ret < 0)
         return ret;
 
     if (phydev->drv->config_init) {
         ret = phydev->drv->config_init(phydev);
         if (ret < 0)
             return ret;
     }
 
     if (phydev->drv->config_intr) {
         ret = phydev->drv->config_intr(phydev);
         if (ret < 0)
             return ret;
     }
 
     return 0;
 }
 EXPORT_SYMBOL(phy_init_hw);
 
 void phy_attached_info(struct phy_device *phydev)
 {
     phy_attached_print(phydev, NULL);
 }
 EXPORT_SYMBOL(phy_attached_info);
 
 #define ATTACHED_FMT "attached PHY driver %s(mii_bus:phy_addr=%s, irq=%s)"
 char *phy_attached_info_irq(struct phy_device *phydev)
 {
     char *irq_str;
     char irq_num[8];
 
     switch(phydev->irq) {
     case PHY_POLL:
         irq_str = "POLL";
         break;
     case PHY_MAC_INTERRUPT:
         irq_str = "MAC";
         break;
     default:
         snprintf(irq_num, sizeof(irq_num), "%d", phydev->irq);
         irq_str = irq_num;
         break;
     }
 
     return kasprintf(GFP_KERNEL, "%s", irq_str);
 }
 EXPORT_SYMBOL(phy_attached_info_irq);
 
 void phy_attached_print(struct phy_device *phydev, const char *fmt, ...)
 {
     const char *unbound = phydev->drv ? "" : "[unbound] ";
     char *irq_str = phy_attached_info_irq(phydev);
 
     if (!fmt) {
         phydev_info(phydev, ATTACHED_FMT "\n", unbound,
                 phydev_name(phydev), irq_str);
     } else {
         va_list ap;
 
         phydev_info(phydev, ATTACHED_FMT, unbound,
                 phydev_name(phydev), irq_str);
 
         va_start(ap, fmt);
         vprintk(fmt, ap);
         va_end(ap);
     }
     kfree(irq_str);
 }
 EXPORT_SYMBOL(phy_attached_print);
 
 static void phy_sysfs_create_links(struct phy_device *phydev)
 {
     struct net_device *dev = phydev->attached_dev;
     int err;
 
     if (!dev)
         return;
 
     err = sysfs_create_link(&phydev->mdio.dev.kobj, &dev->dev.kobj,
                 "attached_dev");
     if (err)
         return;
 
     err = sysfs_create_link_nowarn(&dev->dev.kobj,
                        &phydev->mdio.dev.kobj,
                        "phydev");
     if (err) {
         dev_err(&dev->dev, "could not add device link to %s err %d\n",
             kobject_name(&phydev->mdio.dev.kobj),
             err);
         /* non-fatal - some net drivers can use one netdevice
          * with more then one phy
          */
     }
 
     phydev->sysfs_links = true;
 }
 
 static ssize_t
 phy_standalone_show(struct device *dev, struct device_attribute *attr,
             char *buf)
 {
     struct phy_device *phydev = to_phy_device(dev);
 
     return sprintf(buf, "%d\n", !phydev->attached_dev);
 }
 static DEVICE_ATTR_RO(phy_standalone);
 
 /**
  * phy_sfp_attach - attach the SFP bus to the PHY upstream network device
  * @upstream: pointer to the phy device
  * @bus: sfp bus representing cage being attached
  *
  * This is used to fill in the sfp_upstream_ops .attach member.
  */
 void phy_sfp_attach(void *upstream, struct sfp_bus *bus)
 {
     struct phy_device *phydev = upstream;
 
     if (phydev->attached_dev)
         phydev->attached_dev->sfp_bus = bus;
     phydev->sfp_bus_attached = true;
 }
 EXPORT_SYMBOL(phy_sfp_attach);
 
 /**
  * phy_sfp_detach - detach the SFP bus from the PHY upstream network device
  * @upstream: pointer to the phy device
  * @bus: sfp bus representing cage being attached
  *
  * This is used to fill in the sfp_upstream_ops .detach member.
  */
 void phy_sfp_detach(void *upstream, struct sfp_bus *bus)
 {
     struct phy_device *phydev = upstream;
 
     if (phydev->attached_dev)
         phydev->attached_dev->sfp_bus = NULL;
     phydev->sfp_bus_attached = false;
 }
 EXPORT_SYMBOL(phy_sfp_detach);
 
 /**
  * phy_sfp_probe - probe for a SFP cage attached to this PHY device
  * @phydev: Pointer to phy_device
  * @ops: SFP's upstream operations
  */
 int phy_sfp_probe(struct phy_device *phydev,
           const struct sfp_upstream_ops *ops)
 {
     struct sfp_bus *bus;
     int ret = 0;
 
     if (phydev->mdio.dev.fwnode) {
         bus = sfp_bus_find_fwnode(phydev->mdio.dev.fwnode);
         if (IS_ERR(bus))
             return PTR_ERR(bus);
 
         phydev->sfp_bus = bus;
 
         ret = sfp_bus_add_upstream(bus, phydev, ops);
         sfp_bus_put(bus);
     }
     return ret;
 }
 EXPORT_SYMBOL(phy_sfp_probe);
 
 /**
  * phy_attach_direct - attach a network device to a given PHY device pointer
  * @dev: network device to attach
  * @phydev: Pointer to phy_device to attach
  * @flags: PHY device's dev_flags
  * @interface: PHY device's interface
  *
  * Description: Called by drivers to attach to a particular PHY
  *     device. The phy_device is found, and properly hooked up
  *     to the phy_driver.  If no driver is attached, then a
  *     generic driver is used.  The phy_device is given a ptr to
  *     the attaching device, and given a callback for link status
  *     change.  The phy_device is returned to the attaching driver.
  *     This function takes a reference on the phy device.
  */
 int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,
               u32 flags, phy_interface_t interface)
 {
     struct mii_bus *bus = phydev->mdio.bus;
     struct device *d = &phydev->mdio.dev;
     struct module *ndev_owner = NULL;
     bool using_genphy = false;
     int err;
 
     /* For Ethernet device drivers that register their own MDIO bus, we
      * will have bus->owner match ndev_mod, so we do not want to increment
      * our own module->refcnt here, otherwise we would not be able to
      * unload later on.
      */
     if (dev)
         ndev_owner = dev->dev.parent->driver->owner;
     if (ndev_owner != bus->owner && !try_module_get(bus->owner)) {
         phydev_err(phydev, "failed to get the bus module\n");
         return -EIO;
     }
 
     get_device(d);
 
     /* Assume that if there is no driver, that it doesn't
      * exist, and we should use the genphy driver.
      */
     if (!d->driver) {
         if (phydev->is_c45)
             d->driver = &genphy_c45_driver.mdiodrv.driver;
         else
             d->driver = &genphy_driver.mdiodrv.driver;
 
         using_genphy = true;
     }
 
     if (!try_module_get(d->driver->owner)) {
         phydev_err(phydev, "failed to get the device driver module\n");
         err = -EIO;
         goto error_put_device;
     }
 
     if (using_genphy) {
         err = d->driver->probe(d);
         if (err >= 0)
             err = device_bind_driver(d);
 
         if (err)
             goto error_module_put;
     }
 
     if (phydev->attached_dev) {
         dev_err(&dev->dev, "PHY already attached\n");
         err = -EBUSY;
         goto error;
     }
 
     phydev->phy_link_change = phy_link_change;
     if (dev) {
         phydev->attached_dev = dev;
         dev->phydev = phydev;
 
         if (phydev->sfp_bus_attached)
             dev->sfp_bus = phydev->sfp_bus;
         else if (dev->sfp_bus)
             phydev->is_on_sfp_module = true;
     }
 
     /* Some Ethernet drivers try to connect to a PHY device before
      * calling register_netdevice() -> netdev_register_kobject() and
      * does the dev->dev.kobj initialization. Here we only check for
      * success which indicates that the network device kobject is
      * ready. Once we do that we still need to keep track of whether
      * links were successfully set up or not for phy_detach() to
      * remove them accordingly.
      */
     phydev->sysfs_links = false;
 
     phy_sysfs_create_links(phydev);
 
     if (!phydev->attached_dev) {
         err = sysfs_create_file(&phydev->mdio.dev.kobj,
                     &dev_attr_phy_standalone.attr);
         if (err)
             phydev_err(phydev, "error creating 'phy_standalone' sysfs entry\n");
     }
 
     phydev->dev_flags |= flags;
 
     phydev->interface = interface;
 
     phydev->state = PHY_READY;
 
     phydev->interrupts = PHY_INTERRUPT_DISABLED;
 
     /* Port is set to PORT_TP by default and the actual PHY driver will set
      * it to different value depending on the PHY configuration. If we have
      * the generic PHY driver we can't figure it out, thus set the old
      * legacy PORT_MII value.
      */
     if (using_genphy)
         phydev->port = PORT_MII;
 
     /* Initial carrier state is off as the phy is about to be
      * (re)initialized.
      */
     if (dev)
         netif_carrier_off(phydev->attached_dev);
 
     /* Do initial configuration here, now that
      * we have certain key parameters
      * (dev_flags and interface)
      */
     err = phy_init_hw(phydev);
     if (err)
         goto error;
 
     phy_resume(phydev);
     phy_led_triggers_register(phydev);
 
     return err;
 
 error:
     /* phy_detach() does all of the cleanup below */
     phy_detach(phydev);
     return err;
 
 error_module_put:
     module_put(d->driver->owner);
 error_put_device:
     put_device(d);
     if (ndev_owner != bus->owner)
         module_put(bus->owner);
     return err;
 }
 EXPORT_SYMBOL(phy_attach_direct);
 
 /**
  * phy_attach - attach a network device to a particular PHY device
  * @dev: network device to attach
  * @bus_id: Bus ID of PHY device to attach
  * @interface: PHY device's interface
  *
  * Description: Same as phy_attach_direct() except that a PHY bus_id
  *     string is passed instead of a pointer to a struct phy_device.
  */
 struct phy_device *phy_attach(struct net_device *dev, const char *bus_id,
                   phy_interface_t interface)
 {
     struct bus_type *bus = &mdio_bus_type;
     struct phy_device *phydev;
     struct device *d;
     int rc;
 
     if (!dev)
         return ERR_PTR(-EINVAL);
 
     /* Search the list of PHY devices on the mdio bus for the
      * PHY with the requested name
      */
     d = bus_find_device_by_name(bus, NULL, bus_id);
     if (!d) {
         pr_err("PHY %s not found\n", bus_id);
         return ERR_PTR(-ENODEV);
     }
     phydev = to_phy_device(d);
 
     rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface);
     put_device(d);
     if (rc)
         return ERR_PTR(rc);
 
     return phydev;
 }
 EXPORT_SYMBOL(phy_attach);
 
 static bool phy_driver_is_genphy_kind(struct phy_device *phydev,
                       struct device_driver *driver)
 {
     struct device *d = &phydev->mdio.dev;
     bool ret = false;
 
     if (!phydev->drv)
         return ret;
 
     get_device(d);
     ret = d->driver == driver;
     put_device(d);
 
     return ret;
 }
 
 bool phy_driver_is_genphy(struct phy_device *phydev)
 {
     return phy_driver_is_genphy_kind(phydev,
                      &genphy_driver.mdiodrv.driver);
 }
 EXPORT_SYMBOL_GPL(phy_driver_is_genphy);
 
 bool phy_driver_is_genphy_10g(struct phy_device *phydev)
 {
     return phy_driver_is_genphy_kind(phydev,
                      &genphy_c45_driver.mdiodrv.driver);
 }
 EXPORT_SYMBOL_GPL(phy_driver_is_genphy_10g);
 
 /**
  * phy_package_join - join a common PHY group
  * @phydev: target phy_device struct
  * @addr: cookie and PHY address for global register access
  * @priv_size: if non-zero allocate this amount of bytes for private data
  *
  * This joins a PHY group and provides a shared storage for all phydevs in
  * this group. This is intended to be used for packages which contain
  * more than one PHY, for example a quad PHY transceiver.
  *
  * The addr parameter serves as a cookie which has to have the same value
  * for all members of one group and as a PHY address to access generic
  * registers of a PHY package. Usually, one of the PHY addresses of the
  * different PHYs in the package provides access to these global registers.
  * The address which is given here, will be used in the phy_package_read()
  * and phy_package_write() convenience functions. If your PHY doesn't have
  * global registers you can just pick any of the PHY addresses.
  *
  * This will set the shared pointer of the phydev to the shared storage.
  * If this is the first call for a this cookie the shared storage will be
  * allocated. If priv_size is non-zero, the given amount of bytes are
  * allocated for the priv member.
  *
  * Returns < 1 on error, 0 on success. Esp. calling phy_package_join()
  * with the same cookie but a different priv_size is an error.
  */
 int phy_package_join(struct phy_device *phydev, int addr, size_t priv_size)
 {
     struct mii_bus *bus = phydev->mdio.bus;
     struct phy_package_shared *shared;
     int ret;
 
     if (addr < 0 || addr >= PHY_MAX_ADDR)
         return -EINVAL;
 
     mutex_lock(&bus->shared_lock);
     shared = bus->shared[addr];
     if (!shared) {
         ret = -ENOMEM;
         shared = kzalloc(sizeof(*shared), GFP_KERNEL);
         if (!shared)
             goto err_unlock;
         if (priv_size) {
             shared->priv = kzalloc(priv_size, GFP_KERNEL);
             if (!shared->priv)
                 goto err_free;
             shared->priv_size = priv_size;
         }
         shared->addr = addr;
         refcount_set(&shared->refcnt, 1);
         bus->shared[addr] = shared;
     } else {
         ret = -EINVAL;
         if (priv_size && priv_size != shared->priv_size)
             goto err_unlock;
         refcount_inc(&shared->refcnt);
     }
     mutex_unlock(&bus->shared_lock);
 
     phydev->shared = shared;
 
     return 0;
 
 err_free:
     kfree(shared);
 err_unlock:
     mutex_unlock(&bus->shared_lock);
     return ret;
 }
 EXPORT_SYMBOL_GPL(phy_package_join);
 
 /**
  * phy_package_leave - leave a common PHY group
  * @phydev: target phy_device struct
  *
  * This leaves a PHY group created by phy_package_join(). If this phydev
  * was the last user of the shared data between the group, this data is
  * freed. Resets the phydev->shared pointer to NULL.
  */
 void phy_package_leave(struct phy_device *phydev)
 {
     struct phy_package_shared *shared = phydev->shared;
     struct mii_bus *bus = phydev->mdio.bus;
 
     if (!shared)
         return;
 
     if (refcount_dec_and_mutex_lock(&shared->refcnt, &bus->shared_lock)) {
         bus->shared[shared->addr] = NULL;
         mutex_unlock(&bus->shared_lock);
         kfree(shared->priv);
         kfree(shared);
     }
 
     phydev->shared = NULL;
 }
 EXPORT_SYMBOL_GPL(phy_package_leave);
 
 static void devm_phy_package_leave(struct device *dev, void *res)
 {
     phy_package_leave(*(struct phy_device **)res);
 }
 
 /**
  * devm_phy_package_join - resource managed phy_package_join()
  * @dev: device that is registering this PHY package
  * @phydev: target phy_device struct
  * @addr: cookie and PHY address for global register access
  * @priv_size: if non-zero allocate this amount of bytes for private data
  *
  * Managed phy_package_join(). Shared storage fetched by this function,
  * phy_package_leave() is automatically called on driver detach. See
  * phy_package_join() for more information.
  */
 int devm_phy_package_join(struct device *dev, struct phy_device *phydev,
               int addr, size_t priv_size)
 {
     struct phy_device **ptr;
     int ret;
 
     ptr = devres_alloc(devm_phy_package_leave, sizeof(*ptr),
                GFP_KERNEL);
     if (!ptr)
         return -ENOMEM;
 
     ret = phy_package_join(phydev, addr, priv_size);
 
     if (!ret) {
         *ptr = phydev;
         devres_add(dev, ptr);
     } else {
         devres_free(ptr);
     }
 
     return ret;
 }
 EXPORT_SYMBOL_GPL(devm_phy_package_join);
 
 /**
  * phy_detach - detach a PHY device from its network device
  * @phydev: target phy_device struct
  *
  * This detaches the phy device from its network device and the phy
  * driver, and drops the reference count taken in phy_attach_direct().
  */
 void phy_detach(struct phy_device *phydev)
 {
     struct net_device *dev = phydev->attached_dev;
     struct module *ndev_owner = NULL;
     struct mii_bus *bus;
 
     if (phydev->sysfs_links) {
         if (dev)
             sysfs_remove_link(&dev->dev.kobj, "phydev");
         sysfs_remove_link(&phydev->mdio.dev.kobj, "attached_dev");
     }
 
     if (!phydev->attached_dev)
         sysfs_remove_file(&phydev->mdio.dev.kobj,
                   &dev_attr_phy_standalone.attr);
 
     phy_suspend(phydev);
     if (dev) {
         phydev->attached_dev->phydev = NULL;
         phydev->attached_dev = NULL;
     }
     phydev->phylink = NULL;
 
     phy_led_triggers_unregister(phydev);
 
     if (phydev->mdio.dev.driver)
         module_put(phydev->mdio.dev.driver->owner);
 
     /* If the device had no specific driver before (i.e. - it
      * was using the generic driver), we unbind the device
      * from the generic driver so that there's a chance a
      * real driver could be loaded
      */
     if (phy_driver_is_genphy(phydev) ||
         phy_driver_is_genphy_10g(phydev))
         device_release_driver(&phydev->mdio.dev);
 
     /* Assert the reset signal */
     phy_device_reset(phydev, 1);
 
     /*
      * The phydev might go away on the put_device() below, so avoid
      * a use-after-free bug by reading the underlying bus first.
      */
     bus = phydev->mdio.bus;
 
     put_device(&phydev->mdio.dev);
     if (dev)
         ndev_owner = dev->dev.parent->driver->owner;
     if (ndev_owner != bus->owner)
         module_put(bus->owner);
 }
 EXPORT_SYMBOL(phy_detach);
 
 int phy_suspend(struct phy_device *phydev)
 {
     struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL };
     struct net_device *netdev = phydev->attached_dev;
     struct phy_driver *phydrv = phydev->drv;
     int ret;
 
     if (phydev->suspended)
         return 0;
 
     /* If the device has WOL enabled, we cannot suspend the PHY */
     phy_ethtool_get_wol(phydev, &wol);
     if (wol.wolopts || (netdev && netdev->wol_enabled))
         return -EBUSY;
 
     if (!phydrv || !phydrv->suspend)
         return 0;
 
     ret = phydrv->suspend(phydev);
     if (!ret)
         phydev->suspended = true;
 
     return ret;
 }
 EXPORT_SYMBOL(phy_suspend);
 
 int __phy_resume(struct phy_device *phydev)
 {
     struct phy_driver *phydrv = phydev->drv;
     int ret;
 
     lockdep_assert_held(&phydev->lock);
 
     if (!phydrv || !phydrv->resume)
         return 0;
 
     ret = phydrv->resume(phydev);
     if (!ret)
         phydev->suspended = false;
 
     return ret;
 }
 EXPORT_SYMBOL(__phy_resume);
 
 int phy_resume(struct phy_device *phydev)
 {
     int ret;
 
     mutex_lock(&phydev->lock);
     ret = __phy_resume(phydev);
     mutex_unlock(&phydev->lock);
 
     return ret;
 }
 EXPORT_SYMBOL(phy_resume);
 
 int phy_loopback(struct phy_device *phydev, bool enable)
 {
     int ret = 0;
 
     if (!phydev->drv)
         return -EIO;
 
     mutex_lock(&phydev->lock);
 
     if (enable && phydev->loopback_enabled) {
         ret = -EBUSY;
         goto out;
     }
 
     if (!enable && !phydev->loopback_enabled) {
         ret = -EINVAL;
         goto out;
     }
 
     if (phydev->drv->set_loopback)
         ret = phydev->drv->set_loopback(phydev, enable);
     else
         ret = genphy_loopback(phydev, enable);
 
     if (ret)
         goto out;
 
     phydev->loopback_enabled = enable;
 
 out:
     mutex_unlock(&phydev->lock);
     return ret;
 }
 EXPORT_SYMBOL(phy_loopback);
 
 /**
  * phy_reset_after_clk_enable - perform a PHY reset if needed
  * @phydev: target phy_device struct
  *
  * Description: Some PHYs are known to need a reset after their refclk was
  *   enabled. This function evaluates the flags and perform the reset if it's
  *   needed. Returns < 0 on error, 0 if the phy wasn't reset and 1 if the phy
  *   was reset.
  */
 int phy_reset_after_clk_enable(struct phy_device *phydev)
 {
     if (!phydev || !phydev->drv)
         return -ENODEV;
 
     if (phydev->drv->flags & PHY_RST_AFTER_CLK_EN) {
         phy_device_reset(phydev, 1);
         phy_device_reset(phydev, 0);
         return 1;
     }
 
     return 0;
 }
 EXPORT_SYMBOL(phy_reset_after_clk_enable);
 
 /* Generic PHY support and helper functions */
 
 /**
  * genphy_config_advert - sanitize and advertise auto-negotiation parameters
  * @phydev: target phy_device struct
  *
  * Description: Writes MII_ADVERTISE with the appropriate values,
  *   after sanitizing the values to make sure we only advertise
  *   what is supported.  Returns < 0 on error, 0 if the PHY's advertisement
  *   hasn't changed, and > 0 if it has changed.
  */
 static int genphy_config_advert(struct phy_device *phydev)
 {
     int err, bmsr, changed = 0;
     u32 adv;
 
     /* Only allow advertising what this PHY supports */
     linkmode_and(phydev->advertising, phydev->advertising,
              phydev->supported);
 
     adv = linkmode_adv_to_mii_adv_t(phydev->advertising);
 
     /* Setup standard advertisement */
     err = phy_modify_changed(phydev, MII_ADVERTISE,
                  ADVERTISE_ALL | ADVERTISE_100BASE4 |
                  ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM,
                  adv);
     if (err < 0)
         return err;
     if (err > 0)
         changed = 1;
 
     bmsr = phy_read(phydev, MII_BMSR);
     if (bmsr < 0)
         return bmsr;
 
     /* Per 802.3-2008, Section 22.2.4.2.16 Extended status all
      * 1000Mbits/sec capable PHYs shall have the BMSR_ESTATEN bit set to a
      * logical 1.
      */
     if (!(bmsr & BMSR_ESTATEN))
         return changed;
 
     adv = linkmode_adv_to_mii_ctrl1000_t(phydev->advertising);
 
     err = phy_modify_changed(phydev, MII_CTRL1000,
                  ADVERTISE_1000FULL | ADVERTISE_1000HALF,
                  adv);
     if (err < 0)
         return err;
     if (err > 0)
         changed = 1;
 
     return changed;
 }
 
 /**
  * genphy_c37_config_advert - sanitize and advertise auto-negotiation parameters
  * @phydev: target phy_device struct
  *
  * Description: Writes MII_ADVERTISE with the appropriate values,
  *   after sanitizing the values to make sure we only advertise
  *   what is supported.  Returns < 0 on error, 0 if the PHY's advertisement
  *   hasn't changed, and > 0 if it has changed. This function is intended
  *   for Clause 37 1000Base-X mode.
  */
 static int genphy_c37_config_advert(struct phy_device *phydev)
 {
     u16 adv = 0;
 
     /* Only allow advertising what this PHY supports */
     linkmode_and(phydev->advertising, phydev->advertising,
              phydev->supported);
 
     if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
                   phydev->advertising))
         adv |= ADVERTISE_1000XFULL;
     if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
                   phydev->advertising))
         adv |= ADVERTISE_1000XPAUSE;
     if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
                   phydev->advertising))
         adv |= ADVERTISE_1000XPSE_ASYM;
 
     return phy_modify_changed(phydev, MII_ADVERTISE,
                   ADVERTISE_1000XFULL | ADVERTISE_1000XPAUSE |
                   ADVERTISE_1000XHALF | ADVERTISE_1000XPSE_ASYM,
                   adv);
 }
 
 /**
  * genphy_config_eee_advert - disable unwanted eee mode advertisement
  * @phydev: target phy_device struct
  *
  * Description: Writes MDIO_AN_EEE_ADV after disabling unsupported energy
  *   efficent ethernet modes. Returns 0 if the PHY's advertisement hasn't
  *   changed, and 1 if it has changed.
  */
 int genphy_config_eee_advert(struct phy_device *phydev)
 {
     int err;
 
     /* Nothing to disable */
     if (!phydev->eee_broken_modes)
         return 0;
 
     err = phy_modify_mmd_changed(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV,
                      phydev->eee_broken_modes, 0);
     /* If the call failed, we assume that EEE is not supported */
     return err < 0 ? 0 : err;
 }
 EXPORT_SYMBOL(genphy_config_eee_advert);
 
 /**
  * genphy_setup_forced - configures/forces speed/duplex from @phydev
  * @phydev: target phy_device struct
  *
  * Description: Configures MII_BMCR to force speed/duplex
  *   to the values in phydev. Assumes that the values are valid.
  *   Please see phy_sanitize_settings().
  */
 int genphy_setup_forced(struct phy_device *phydev)
 {
     u16 ctl;
 
     phydev->pause = 0;
     phydev->asym_pause = 0;
 
     ctl = mii_bmcr_encode_fixed(phydev->speed, phydev->duplex);
 
     return phy_modify(phydev, MII_BMCR,
               ~(BMCR_LOOPBACK | BMCR_ISOLATE | BMCR_PDOWN), ctl);
 }
 EXPORT_SYMBOL(genphy_setup_forced);
 
 static int genphy_setup_master_slave(struct phy_device *phydev)
 {
     u16 ctl = 0;
 
     if (!phydev->is_gigabit_capable)
         return 0;
 
     switch (phydev->master_slave_set) {
     case MASTER_SLAVE_CFG_MASTER_PREFERRED:
         ctl |= CTL1000_PREFER_MASTER;
         break;
     case MASTER_SLAVE_CFG_SLAVE_PREFERRED:
         break;
     case MASTER_SLAVE_CFG_MASTER_FORCE:
         ctl |= CTL1000_AS_MASTER;
         fallthrough;
     case MASTER_SLAVE_CFG_SLAVE_FORCE:
         ctl |= CTL1000_ENABLE_MASTER;
         break;
     case MASTER_SLAVE_CFG_UNKNOWN:
     case MASTER_SLAVE_CFG_UNSUPPORTED:
         return 0;
     default:
         phydev_warn(phydev, "Unsupported Master/Slave mode\n");
         return -EOPNOTSUPP;
     }
 
     return phy_modify_changed(phydev, MII_CTRL1000,
                   (CTL1000_ENABLE_MASTER | CTL1000_AS_MASTER |
                    CTL1000_PREFER_MASTER), ctl);
 }
 
 int genphy_read_master_slave(struct phy_device *phydev)
 {
     int cfg, state;
     int val;
 
     phydev->master_slave_get = MASTER_SLAVE_CFG_UNKNOWN;
     phydev->master_slave_state = MASTER_SLAVE_STATE_UNKNOWN;
 
     val = phy_read(phydev, MII_CTRL1000);
     if (val < 0)
         return val;
 
     if (val & CTL1000_ENABLE_MASTER) {
         if (val & CTL1000_AS_MASTER)
             cfg = MASTER_SLAVE_CFG_MASTER_FORCE;
         else
             cfg = MASTER_SLAVE_CFG_SLAVE_FORCE;
     } else {
         if (val & CTL1000_PREFER_MASTER)
             cfg = MASTER_SLAVE_CFG_MASTER_PREFERRED;
         else
             cfg = MASTER_SLAVE_CFG_SLAVE_PREFERRED;
     }
 
     val = phy_read(phydev, MII_STAT1000);
     if (val < 0)
         return val;
 
     if (val & LPA_1000MSFAIL) {
         state = MASTER_SLAVE_STATE_ERR;
     } else if (phydev->link) {
         /* this bits are valid only for active link */
         if (val & LPA_1000MSRES)
             state = MASTER_SLAVE_STATE_MASTER;
         else
             state = MASTER_SLAVE_STATE_SLAVE;
     } else {
         state = MASTER_SLAVE_STATE_UNKNOWN;
     }
 
     phydev->master_slave_get = cfg;
     phydev->master_slave_state = state;
 
     return 0;
 }
 EXPORT_SYMBOL(genphy_read_master_slave);
 
 /**
  * genphy_restart_aneg - Enable and Restart Autonegotiation
  * @phydev: target phy_device struct
  */
 int genphy_restart_aneg(struct phy_device *phydev)
 {
     /* Don't isolate the PHY if we're negotiating */
     return phy_modify(phydev, MII_BMCR, BMCR_ISOLATE,
               BMCR_ANENABLE | BMCR_ANRESTART);
 }
 EXPORT_SYMBOL(genphy_restart_aneg);
 
 /**
  * genphy_check_and_restart_aneg - Enable and restart auto-negotiation
  * @phydev: target phy_device struct
  * @restart: whether aneg restart is requested
  *
  * Check, and restart auto-negotiation if needed.
  */
 int genphy_check_and_restart_aneg(struct phy_device *phydev, bool restart)
 {
     int ret;
 
     if (!restart) {
         /* Advertisement hasn't changed, but maybe aneg was never on to
          * begin with?  Or maybe phy was isolated?
          */
         ret = phy_read(phydev, MII_BMCR);
         if (ret < 0)
             return ret;
 
         if (!(ret & BMCR_ANENABLE) || (ret & BMCR_ISOLATE))
             restart = true;
     }
 
     if (restart)
         return genphy_restart_aneg(phydev);
 
     return 0;
 }
 EXPORT_SYMBOL(genphy_check_and_restart_aneg);
 
 /**
  * __genphy_config_aneg - restart auto-negotiation or write BMCR
  * @phydev: target phy_device struct
  * @changed: whether autoneg is requested
  *
  * Description: If auto-negotiation is enabled, we configure the
  *   advertising, and then restart auto-negotiation.  If it is not
  *   enabled, then we write the BMCR.
  */
 int __genphy_config_aneg(struct phy_device *phydev, bool changed)
 {
     int err;
 
     if (genphy_config_eee_advert(phydev))
         changed = true;
 
     err = genphy_setup_master_slave(phydev);
     if (err < 0)
         return err;
     else if (err)
         changed = true;
 
     if (AUTONEG_ENABLE != phydev->autoneg)
         return genphy_setup_forced(phydev);
 
     err = genphy_config_advert(phydev);
     if (err < 0) /* error */
         return err;
     else if (err)
         changed = true;
 
     return genphy_check_and_restart_aneg(phydev, changed);
 }
 EXPORT_SYMBOL(__genphy_config_aneg);
 
 /**
  * genphy_c37_config_aneg - restart auto-negotiation or write BMCR
  * @phydev: target phy_device struct
  *
  * Description: If auto-negotiation is enabled, we configure the
  *   advertising, and then restart auto-negotiation.  If it is not
  *   enabled, then we write the BMCR. This function is intended
  *   for use with Clause 37 1000Base-X mode.
  */
 int genphy_c37_config_aneg(struct phy_device *phydev)
 {
     int err, changed;
 
     if (phydev->autoneg != AUTONEG_ENABLE)
         return genphy_setup_forced(phydev);
 
     err = phy_modify(phydev, MII_BMCR, BMCR_SPEED1000 | BMCR_SPEED100,
              BMCR_SPEED1000);
     if (err)
         return err;
 
     changed = genphy_c37_config_advert(phydev);
     if (changed < 0) /* error */
         return changed;
 
     if (!changed) {
         /* Advertisement hasn't changed, but maybe aneg was never on to
          * begin with?  Or maybe phy was isolated?
          */
         int ctl = phy_read(phydev, MII_BMCR);
 
         if (ctl < 0)
             return ctl;
 
         if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))
             changed = 1; /* do restart aneg */
     }
 
     /* Only restart aneg if we are advertising something different
      * than we were before.
      */
     if (changed > 0)
         return genphy_restart_aneg(phydev);
 
     return 0;
 }
 EXPORT_SYMBOL(genphy_c37_config_aneg);
 
 /**
  * genphy_aneg_done - return auto-negotiation status
  * @phydev: target phy_device struct
  *
  * Description: Reads the status register and returns 0 either if
  *   auto-negotiation is incomplete, or if there was an error.
  *   Returns BMSR_ANEGCOMPLETE if auto-negotiation is done.
  */
 int genphy_aneg_done(struct phy_device *phydev)
 {
     int retval = phy_read(phydev, MII_BMSR);
 
     return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
 }
 EXPORT_SYMBOL(genphy_aneg_done);
 
 /**
  * genphy_update_link - update link status in @phydev
  * @phydev: target phy_device struct
  *
  * Description: Update the value in phydev->link to reflect the
  *   current link value.  In order to do this, we need to read
  *   the status register twice, keeping the second value.
  */
 int genphy_update_link(struct phy_device *phydev)
 {
     int status = 0, bmcr;
 
     bmcr = phy_read(phydev, MII_BMCR);
     if (bmcr < 0)
         return bmcr;
 
     /* Autoneg is being started, therefore disregard BMSR value and
      * report link as down.
      */
     if (bmcr & BMCR_ANRESTART)
         goto done;
 
     /* The link state is latched low so that momentary link
      * drops can be detected. Do not double-read the status
      * in polling mode to detect such short link drops except
      * the link was already down.
      */
     if (!phy_polling_mode(phydev) || !phydev->link) {
         status = phy_read(phydev, MII_BMSR);
         if (status < 0)
             return status;
         else if (status & BMSR_LSTATUS)
             goto done;
     }
 
     /* Read link and autonegotiation status */
     status = phy_read(phydev, MII_BMSR);
     if (status < 0)
         return status;
 done:
     phydev->link = status & BMSR_LSTATUS ? 1 : 0;
     phydev->autoneg_complete = status & BMSR_ANEGCOMPLETE ? 1 : 0;
 
     /* Consider the case that autoneg was started and "aneg complete"
      * bit has been reset, but "link up" bit not yet.
      */
     if (phydev->autoneg == AUTONEG_ENABLE && !phydev->autoneg_complete)
         phydev->link = 0;
 
     return 0;
 }
 EXPORT_SYMBOL(genphy_update_link);
 
 int genphy_read_lpa(struct phy_device *phydev)
 {
     int lpa, lpagb;
 
     if (phydev->autoneg == AUTONEG_ENABLE) {
         if (!phydev->autoneg_complete) {
             mii_stat1000_mod_linkmode_lpa_t(phydev->lp_advertising,
                             0);
             mii_lpa_mod_linkmode_lpa_t(phydev->lp_advertising, 0);
             return 0;
         }
 
         if (phydev->is_gigabit_capable) {
             lpagb = phy_read(phydev, MII_STAT1000);
             if (lpagb < 0)
                 return lpagb;
 
             if (lpagb & LPA_1000MSFAIL) {
                 int adv = phy_read(phydev, MII_CTRL1000);
 
                 if (adv < 0)
                     return adv;
 
                 if (adv & CTL1000_ENABLE_MASTER)
                     phydev_err(phydev, "Master/Slave resolution failed, maybe conflicting manual settings?\n");
                 else
                     phydev_err(phydev, "Master/Slave resolution failed\n");
                 return -ENOLINK;
             }
 
             mii_stat1000_mod_linkmode_lpa_t(phydev->lp_advertising,
                             lpagb);
         }
 
         lpa = phy_read(phydev, MII_LPA);
         if (lpa < 0)
             return lpa;
 
         mii_lpa_mod_linkmode_lpa_t(phydev->lp_advertising, lpa);
     } else {
         linkmode_zero(phydev->lp_advertising);
     }
 
     return 0;
 }
 EXPORT_SYMBOL(genphy_read_lpa);
 
 /**
  * genphy_read_status_fixed - read the link parameters for !aneg mode
  * @phydev: target phy_device struct
  *
  * Read the current duplex and speed state for a PHY operating with
  * autonegotiation disabled.
  */
 int genphy_read_status_fixed(struct phy_device *phydev)
 {
     int bmcr = phy_read(phydev, MII_BMCR);
 
     if (bmcr < 0)
         return bmcr;
 
     if (bmcr & BMCR_FULLDPLX)
         phydev->duplex = DUPLEX_FULL;
     else
         phydev->duplex = DUPLEX_HALF;
 
     if (bmcr & BMCR_SPEED1000)
         phydev->speed = SPEED_1000;
     else if (bmcr & BMCR_SPEED100)
         phydev->speed = SPEED_100;
     else
         phydev->speed = SPEED_10;
 
     return 0;
 }
 EXPORT_SYMBOL(genphy_read_status_fixed);
 
 /**
  * genphy_read_status - check the link status and update current link state
  * @phydev: target phy_device struct
  *
  * Description: Check the link, then figure out the current state
  *   by comparing what we advertise with what the link partner
  *   advertises.  Start by checking the gigabit possibilities,
  *   then move on to 10/100.
  */
 int genphy_read_status(struct phy_device *phydev)
 {
     int err, old_link = phydev->link;
 
     /* Update the link, but return if there was an error */
     err = genphy_update_link(phydev);
     if (err)
         return err;
 
     /* why bother the PHY if nothing can have changed */
     if (phydev->autoneg == AUTONEG_ENABLE && old_link && phydev->link)
         return 0;
 
     phydev->master_slave_get = MASTER_SLAVE_CFG_UNSUPPORTED;
     phydev->master_slave_state = MASTER_SLAVE_STATE_UNSUPPORTED;
     phydev->speed = SPEED_UNKNOWN;
     phydev->duplex = DUPLEX_UNKNOWN;
     phydev->pause = 0;
     phydev->asym_pause = 0;
 
     if (phydev->is_gigabit_capable) {
         err = genphy_read_master_slave(phydev);
         if (err < 0)
             return err;
     }
 
     err = genphy_read_lpa(phydev);
     if (err < 0)
         return err;
 
     if (phydev->autoneg == AUTONEG_ENABLE && phydev->autoneg_complete) {
         phy_resolve_aneg_linkmode(phydev);
     } else if (phydev->autoneg == AUTONEG_DISABLE) {
         err = genphy_read_status_fixed(phydev);
         if (err < 0)
             return err;
     }
 
     return 0;
 }
 EXPORT_SYMBOL(genphy_read_status);
 
 /**
  * genphy_c37_read_status - check the link status and update current link state
  * @phydev: target phy_device struct
  *
  * Description: Check the link, then figure out the current state
  *   by comparing what we advertise with what the link partner
  *   advertises. This function is for Clause 37 1000Base-X mode.
  */
 int genphy_c37_read_status(struct phy_device *phydev)
 {
     int lpa, err, old_link = phydev->link;
 
     /* Update the link, but return if there was an error */
     err = genphy_update_link(phydev);
     if (err)
         return err;
 
     /* why bother the PHY if nothing can have changed */
     if (phydev->autoneg == AUTONEG_ENABLE && old_link && phydev->link)
         return 0;
 
     phydev->duplex = DUPLEX_UNKNOWN;
     phydev->pause = 0;
     phydev->asym_pause = 0;
 
     if (phydev->autoneg == AUTONEG_ENABLE && phydev->autoneg_complete) {
         lpa = phy_read(phydev, MII_LPA);
         if (lpa < 0)
             return lpa;
 
         linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
                  phydev->lp_advertising, lpa & LPA_LPACK);
         linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
                  phydev->lp_advertising, lpa & LPA_1000XFULL);
         linkmode_mod_bit(ETHTOOL_LINK_MODE_Pause_BIT,
                  phydev->lp_advertising, lpa & LPA_1000XPAUSE);
         linkmode_mod_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
                  phydev->lp_advertising,
                  lpa & LPA_1000XPAUSE_ASYM);
 
         phy_resolve_aneg_linkmode(phydev);
     } else if (phydev->autoneg == AUTONEG_DISABLE) {
         int bmcr = phy_read(phydev, MII_BMCR);
 
         if (bmcr < 0)
             return bmcr;
 
         if (bmcr & BMCR_FULLDPLX)
             phydev->duplex = DUPLEX_FULL;
         else
             phydev->duplex = DUPLEX_HALF;
     }
 
     return 0;
 }
 EXPORT_SYMBOL(genphy_c37_read_status);
 
 /**
  * genphy_soft_reset - software reset the PHY via BMCR_RESET bit
  * @phydev: target phy_device struct
  *
  * Description: Perform a software PHY reset using the standard
  * BMCR_RESET bit and poll for the reset bit to be cleared.
  *
  * Returns: 0 on success, < 0 on failure
  */
 int genphy_soft_reset(struct phy_device *phydev)
 {
     u16 res = BMCR_RESET;
     int ret;
 
     if (phydev->autoneg == AUTONEG_ENABLE)
         res |= BMCR_ANRESTART;
 
     ret = phy_modify(phydev, MII_BMCR, BMCR_ISOLATE, res);
     if (ret < 0)
         return ret;
 
     /* Clause 22 states that setting bit BMCR_RESET sets control registers
      * to their default value. Therefore the POWER DOWN bit is supposed to
      * be cleared after soft reset.
      */
     phydev->suspended = 0;
 
     ret = phy_poll_reset(phydev);
     if (ret)
         return ret;
 
     /* BMCR may be reset to defaults */
     if (phydev->autoneg == AUTONEG_DISABLE)
         ret = genphy_setup_forced(phydev);
 
     return ret;
 }
 EXPORT_SYMBOL(genphy_soft_reset);
 
 irqreturn_t genphy_handle_interrupt_no_ack(struct phy_device *phydev)
 {
     /* It seems there are cases where the interrupts are handled by another
      * entity (ie an IRQ controller embedded inside the PHY) and do not
      * need any other interraction from phylib. In this case, just trigger
      * the state machine directly.
      */
     phy_trigger_machine(phydev);
 
     return 0;
 }
 EXPORT_SYMBOL(genphy_handle_interrupt_no_ack);
 
 /**
  * genphy_read_abilities - read PHY abilities from Clause 22 registers
  * @phydev: target phy_device struct
  *
  * Description: Reads the PHY's abilities and populates
  * phydev->supported accordingly.
  *
  * Returns: 0 on success, < 0 on failure
  */
 int genphy_read_abilities(struct phy_device *phydev)
 {
     int val;
 
     linkmode_set_bit_array(phy_basic_ports_array,
                    ARRAY_SIZE(phy_basic_ports_array),
                    phydev->supported);
 
     val = phy_read(phydev, MII_BMSR);
     if (val < 0)
         return val;
 
     linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phydev->supported,
              val & BMSR_ANEGCAPABLE);
 
     linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, phydev->supported,
              val & BMSR_100FULL);
     linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT, phydev->supported,
              val & BMSR_100HALF);
     linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, phydev->supported,
              val & BMSR_10FULL);
     linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, phydev->supported,
              val & BMSR_10HALF);
 
     if (val & BMSR_ESTATEN) {
         val = phy_read(phydev, MII_ESTATUS);
         if (val < 0)
             return val;
 
         linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
                  phydev->supported, val & ESTATUS_1000_TFULL);
         linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
                  phydev->supported, val & ESTATUS_1000_THALF);
         linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
                  phydev->supported, val & ESTATUS_1000_XFULL);
     }
 
     return 0;
 }
 EXPORT_SYMBOL(genphy_read_abilities);
 
 /* This is used for the phy device which doesn't support the MMD extended
  * register access, but it does have side effect when we are trying to access
  * the MMD register via indirect method.
  */
 int genphy_read_mmd_unsupported(struct phy_device *phdev, int devad, u16 regnum)
 {
     return -EOPNOTSUPP;
 }
 EXPORT_SYMBOL(genphy_read_mmd_unsupported);
 
 int genphy_write_mmd_unsupported(struct phy_device *phdev, int devnum,
                  u16 regnum, u16 val)
 {
     return -EOPNOTSUPP;
 }
 EXPORT_SYMBOL(genphy_write_mmd_unsupported);
 
 int genphy_suspend(struct phy_device *phydev)
 {
     return phy_set_bits(phydev, MII_BMCR, BMCR_PDOWN);
 }
 EXPORT_SYMBOL(genphy_suspend);
 
 int genphy_resume(struct phy_device *phydev)
 {
     return phy_clear_bits(phydev, MII_BMCR, BMCR_PDOWN);
 }
 EXPORT_SYMBOL(genphy_resume);
 
 int genphy_loopback(struct phy_device *phydev, bool enable)
 {
     if (enable) {
         u16 val, ctl = BMCR_LOOPBACK;
         int ret;
 
         ctl |= mii_bmcr_encode_fixed(phydev->speed, phydev->duplex);
 
         phy_modify(phydev, MII_BMCR, ~0, ctl);
 
         ret = phy_read_poll_timeout(phydev, MII_BMSR, val,
                         val & BMSR_LSTATUS,
                     5000, 500000, true);
         if (ret)
             return ret;
     } else {
         phy_modify(phydev, MII_BMCR, BMCR_LOOPBACK, 0);
 
         phy_config_aneg(phydev);
     }
 
     return 0;
 }
 EXPORT_SYMBOL(genphy_loopback);
 
 /**
  * phy_remove_link_mode - Remove a supported link mode
  * @phydev: phy_device structure to remove link mode from
  * @link_mode: Link mode to be removed
  *
  * Description: Some MACs don't support all link modes which the PHY
  * does.  e.g. a 1G MAC often does not support 1000Half. Add a helper
  * to remove a link mode.
  */
 void phy_remove_link_mode(struct phy_device *phydev, u32 link_mode)
 {
     linkmode_clear_bit(link_mode, phydev->supported);
     phy_advertise_supported(phydev);
 }
 EXPORT_SYMBOL(phy_remove_link_mode);
 
 static void phy_copy_pause_bits(unsigned long *dst, unsigned long *src)
 {
     linkmode_mod_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, dst,
         linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, src));
     linkmode_mod_bit(ETHTOOL_LINK_MODE_Pause_BIT, dst,
         linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT, src));
 }
 
 /**
  * phy_advertise_supported - Advertise all supported modes
  * @phydev: target phy_device struct
  *
  * Description: Called to advertise all supported modes, doesn't touch
  * pause mode advertising.
  */
 void phy_advertise_supported(struct phy_device *phydev)
 {
     __ETHTOOL_DECLARE_LINK_MODE_MASK(new);
 
     linkmode_copy(new, phydev->supported);
     phy_copy_pause_bits(new, phydev->advertising);
     linkmode_copy(phydev->advertising, new);
 }
 EXPORT_SYMBOL(phy_advertise_supported);
 
 /**
  * phy_support_sym_pause - Enable support of symmetrical pause
  * @phydev: target phy_device struct
  *
  * Description: Called by the MAC to indicate is supports symmetrical
  * Pause, but not asym pause.
  */
 void phy_support_sym_pause(struct phy_device *phydev)
 {
     linkmode_clear_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, phydev->supported);
     phy_copy_pause_bits(phydev->advertising, phydev->supported);
 }
 EXPORT_SYMBOL(phy_support_sym_pause);
 
 /**
  * phy_support_asym_pause - Enable support of asym pause
  * @phydev: target phy_device struct
  *
  * Description: Called by the MAC to indicate is supports Asym Pause.
  */
 void phy_support_asym_pause(struct phy_device *phydev)
 {
     phy_copy_pause_bits(phydev->advertising, phydev->supported);
 }
 EXPORT_SYMBOL(phy_support_asym_pause);
 
 /**
  * phy_set_sym_pause - Configure symmetric Pause
  * @phydev: target phy_device struct
  * @rx: Receiver Pause is supported
  * @tx: Transmit Pause is supported
  * @autoneg: Auto neg should be used
  *
  * Description: Configure advertised Pause support depending on if
  * receiver pause and pause auto neg is supported. Generally called
  * from the set_pauseparam .ndo.
  */
 void phy_set_sym_pause(struct phy_device *phydev, bool rx, bool tx,
                bool autoneg)
 {
     linkmode_clear_bit(ETHTOOL_LINK_MODE_Pause_BIT, phydev->supported);
 
     if (rx && tx && autoneg)
         linkmode_set_bit(ETHTOOL_LINK_MODE_Pause_BIT,
                  phydev->supported);
 
     linkmode_copy(phydev->advertising, phydev->supported);
 }
 EXPORT_SYMBOL(phy_set_sym_pause);
 
 /**
  * phy_set_asym_pause - Configure Pause and Asym Pause
  * @phydev: target phy_device struct
  * @rx: Receiver Pause is supported
  * @tx: Transmit Pause is supported
  *
  * Description: Configure advertised Pause support depending on if
  * transmit and receiver pause is supported. If there has been a
  * change in adverting, trigger a new autoneg. Generally called from
  * the set_pauseparam .ndo.
  */
 void phy_set_asym_pause(struct phy_device *phydev, bool rx, bool tx)
 {
     __ETHTOOL_DECLARE_LINK_MODE_MASK(oldadv);
 
     linkmode_copy(oldadv, phydev->advertising);
     linkmode_set_pause(phydev->advertising, tx, rx);
 
     if (!linkmode_equal(oldadv, phydev->advertising) &&
         phydev->autoneg)
         phy_start_aneg(phydev);
 }
 EXPORT_SYMBOL(phy_set_asym_pause);
 
 /**
  * phy_validate_pause - Test if the PHY/MAC support the pause configuration
  * @phydev: phy_device struct
  * @pp: requested pause configuration
  *
  * Description: Test if the PHY/MAC combination supports the Pause
  * configuration the user is requesting. Returns True if it is
  * supported, false otherwise.
  */
 bool phy_validate_pause(struct phy_device *phydev,
             struct ethtool_pauseparam *pp)
 {
     if (!linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
                    phydev->supported) && pp->rx_pause)
         return false;
 
     if (!linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
                    phydev->supported) &&
         pp->rx_pause != pp->tx_pause)
         return false;
 
     return true;
 }
 EXPORT_SYMBOL(phy_validate_pause);
 
 /**
  * phy_get_pause - resolve negotiated pause modes
  * @phydev: phy_device struct
  * @tx_pause: pointer to bool to indicate whether transmit pause should be
  * enabled.
  * @rx_pause: pointer to bool to indicate whether receive pause should be
  * enabled.
  *
  * Resolve and return the flow control modes according to the negotiation
  * result. This includes checking that we are operating in full duplex mode.
  * See linkmode_resolve_pause() for further details.
  */
 void phy_get_pause(struct phy_device *phydev, bool *tx_pause, bool *rx_pause)
 {
     if (phydev->duplex != DUPLEX_FULL) {
         *tx_pause = false;
         *rx_pause = false;
         return;
     }
 
     return linkmode_resolve_pause(phydev->advertising,
                       phydev->lp_advertising,
                       tx_pause, rx_pause);
 }
 EXPORT_SYMBOL(phy_get_pause);
 
 #if IS_ENABLED(CONFIG_OF_MDIO)
 static int phy_get_int_delay_property(struct device *dev, const char *name)
 {
     s32 int_delay;
     int ret;
 
     ret = device_property_read_u32(dev, name, &int_delay);
     if (ret)
         return ret;
 
     return int_delay;
 }
 #else
 static int phy_get_int_delay_property(struct device *dev, const char *name)
 {
     return -EINVAL;
 }
 #endif
 
 /**
  * phy_get_internal_delay - returns the index of the internal delay
  * @phydev: phy_device struct
  * @dev: pointer to the devices device struct
  * @delay_values: array of delays the PHY supports
  * @size: the size of the delay array
  * @is_rx: boolean to indicate to get the rx internal delay
  *
  * Returns the index within the array of internal delay passed in.
  * If the device property is not present then the interface type is checked
  * if the interface defines use of internal delay then a 1 is returned otherwise
  * a 0 is returned.
  * The array must be in ascending order. If PHY does not have an ascending order
  * array then size = 0 and the value of the delay property is returned.
  * Return -EINVAL if the delay is invalid or cannot be found.
  */
 s32 phy_get_internal_delay(struct phy_device *phydev, struct device *dev,
                const int *delay_values, int size, bool is_rx)
 {
     s32 delay;
     int i;
 
     if (is_rx) {
         delay = phy_get_int_delay_property(dev, "rx-internal-delay-ps");
         if (delay < 0 && size == 0) {
             if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
                 phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID)
                 return 1;
             else
                 return 0;
         }
 
     } else {
         delay = phy_get_int_delay_property(dev, "tx-internal-delay-ps");
         if (delay < 0 && size == 0) {
             if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
                 phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID)
                 return 1;
             else
                 return 0;
         }
     }
 
     if (delay < 0)
         return delay;
 
     if (delay && size == 0)
         return delay;
 
     if (delay < delay_values[0] || delay > delay_values[size - 1]) {
         phydev_err(phydev, "Delay %d is out of range\n", delay);
         return -EINVAL;
     }
 
     if (delay == delay_values[0])
         return 0;
 
     for (i = 1; i < size; i++) {
         if (delay == delay_values[i])
             return i;
 
         /* Find an approximate index by looking up the table */
         if (delay > delay_values[i - 1] &&
             delay < delay_values[i]) {
             if (delay - delay_values[i - 1] <
                 delay_values[i] - delay)
                 return i - 1;
             else
                 return i;
         }
     }
 
     phydev_err(phydev, "error finding internal delay index for %d\n",
            delay);
 
     return -EINVAL;
 }
 EXPORT_SYMBOL(phy_get_internal_delay);
 
 static bool phy_drv_supports_irq(struct phy_driver *phydrv)
 {
     return phydrv->config_intr && phydrv->handle_interrupt;
 }
 
 /**
  * fwnode_mdio_find_device - Given a fwnode, find the mdio_device
  * @fwnode: pointer to the mdio_device's fwnode
  *
  * If successful, returns a pointer to the mdio_device with the embedded
  * struct device refcount incremented by one, or NULL on failure.
  * The caller should call put_device() on the mdio_device after its use.
  */
 struct mdio_device *fwnode_mdio_find_device(struct fwnode_handle *fwnode)
 {
     struct device *d;
 
     if (!fwnode)
         return NULL;
 
     d = bus_find_device_by_fwnode(&mdio_bus_type, fwnode);
     if (!d)
         return NULL;
 
     return to_mdio_device(d);
 }
 EXPORT_SYMBOL(fwnode_mdio_find_device);
 
 /**
  * fwnode_phy_find_device - For provided phy_fwnode, find phy_device.
  *
  * @phy_fwnode: Pointer to the phy's fwnode.
  *
  * If successful, returns a pointer to the phy_device with the embedded
  * struct device refcount incremented by one, or NULL on failure.
  */
 struct phy_device *fwnode_phy_find_device(struct fwnode_handle *phy_fwnode)
 {
     struct mdio_device *mdiodev;
 
     mdiodev = fwnode_mdio_find_device(phy_fwnode);
     if (!mdiodev)
         return NULL;
 
     if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY)
         return to_phy_device(&mdiodev->dev);
 
     put_device(&mdiodev->dev);
 
     return NULL;
 }
 EXPORT_SYMBOL(fwnode_phy_find_device);
 
 /**
  * device_phy_find_device - For the given device, get the phy_device
  * @dev: Pointer to the given device
  *
  * Refer return conditions of fwnode_phy_find_device().
  */
 struct phy_device *device_phy_find_device(struct device *dev)
 {
     return fwnode_phy_find_device(dev_fwnode(dev));
 }
 EXPORT_SYMBOL_GPL(device_phy_find_device);
 
 /**
  * fwnode_get_phy_node - Get the phy_node using the named reference.
  * @fwnode: Pointer to fwnode from which phy_node has to be obtained.
  *
  * Refer return conditions of fwnode_find_reference().
  * For ACPI, only "phy-handle" is supported. Legacy DT properties "phy"
  * and "phy-device" are not supported in ACPI. DT supports all the three
  * named references to the phy node.
  */
 struct fwnode_handle *fwnode_get_phy_node(struct fwnode_handle *fwnode)
 {
     struct fwnode_handle *phy_node;
 
     /* Only phy-handle is used for ACPI */
     phy_node = fwnode_find_reference(fwnode, "phy-handle", 0);
     if (is_acpi_node(fwnode) || !IS_ERR(phy_node))
         return phy_node;
     phy_node = fwnode_find_reference(fwnode, "phy", 0);
     if (IS_ERR(phy_node))
         phy_node = fwnode_find_reference(fwnode, "phy-device", 0);
     return phy_node;
 }
 EXPORT_SYMBOL_GPL(fwnode_get_phy_node);
 
 /**
  * phy_probe - probe and init a PHY device
  * @dev: device to probe and init
  *
  * Description: Take care of setting up the phy_device structure,
  *   set the state to READY (the driver's init function should
  *   set it to STARTING if needed).
  */
 static int phy_probe(struct device *dev)
 {
     struct phy_device *phydev = to_phy_device(dev);
     struct device_driver *drv = phydev->mdio.dev.driver;
     struct phy_driver *phydrv = to_phy_driver(drv);
     int err = 0;
 
     phydev->drv = phydrv;
 
     /* Disable the interrupt if the PHY doesn't support it
      * but the interrupt is still a valid one
      */
     if (!phy_drv_supports_irq(phydrv) && phy_interrupt_is_valid(phydev))
         phydev->irq = PHY_POLL;
 
     if (phydrv->flags & PHY_IS_INTERNAL)
         phydev->is_internal = true;
 
     mutex_lock(&phydev->lock);
 
     /* Deassert the reset signal */
     phy_device_reset(phydev, 0);
 
     if (phydev->drv->probe) {
         err = phydev->drv->probe(phydev);
         if (err)
             goto out;
     }
 
     /* Start out supporting everything. Eventually,
      * a controller will attach, and may modify one
      * or both of these values
      */
     if (phydrv->features)
         linkmode_copy(phydev->supported, phydrv->features);
     else if (phydrv->get_features)
         err = phydrv->get_features(phydev);
     else if (phydev->is_c45)
         err = genphy_c45_pma_read_abilities(phydev);
     else
         err = genphy_read_abilities(phydev);
 
     if (err)
         goto out;
 
     if (!linkmode_test_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
                    phydev->supported))
         phydev->autoneg = 0;
 
     if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
                   phydev->supported))
         phydev->is_gigabit_capable = 1;
     if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
                   phydev->supported))
         phydev->is_gigabit_capable = 1;
 
     of_set_phy_supported(phydev);
     phy_advertise_supported(phydev);
 
     /* Get the EEE modes we want to prohibit. We will ask
      * the PHY stop advertising these mode later on
      */
     of_set_phy_eee_broken(phydev);
 
     /* The Pause Frame bits indicate that the PHY can support passing
      * pause frames. During autonegotiation, the PHYs will determine if
      * they should allow pause frames to pass.  The MAC driver should then
      * use that result to determine whether to enable flow control via
      * pause frames.
      *
      * Normally, PHY drivers should not set the Pause bits, and instead
      * allow phylib to do that.  However, there may be some situations
      * (e.g. hardware erratum) where the driver wants to set only one
      * of these bits.
      */
     if (!test_bit(ETHTOOL_LINK_MODE_Pause_BIT, phydev->supported) &&
         !test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, phydev->supported)) {
         linkmode_set_bit(ETHTOOL_LINK_MODE_Pause_BIT,
                  phydev->supported);
         linkmode_set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
                  phydev->supported);
     }
 
     /* Set the state to READY by default */
     phydev->state = PHY_READY;
 
 out:
     /* Assert the reset signal */
     if (err)
         phy_device_reset(phydev, 1);
 
     mutex_unlock(&phydev->lock);
 
     return err;
 }
 
 static int phy_remove(struct device *dev)
 {
     struct phy_device *phydev = to_phy_device(dev);
 
     cancel_delayed_work_sync(&phydev->state_queue);
 
     mutex_lock(&phydev->lock);
     phydev->state = PHY_DOWN;
     mutex_unlock(&phydev->lock);
 
     sfp_bus_del_upstream(phydev->sfp_bus);
     phydev->sfp_bus = NULL;
 
     if (phydev->drv && phydev->drv->remove)
         phydev->drv->remove(phydev);
 
     /* Assert the reset signal */
     phy_device_reset(phydev, 1);
 
     phydev->drv = NULL;
 
     return 0;
 }
 
 static void phy_shutdown(struct device *dev)
 {
     struct phy_device *phydev = to_phy_device(dev);
 
     if (phydev->state == PHY_READY || !phydev->attached_dev)
         return;
 
     phy_disable_interrupts(phydev);
 }
 
 /**
  * phy_driver_register - register a phy_driver with the PHY layer
  * @new_driver: new phy_driver to register
  * @owner: module owning this PHY
  */
 int phy_driver_register(struct phy_driver *new_driver, struct module *owner)
 {
     int retval;
 
     /* Either the features are hard coded, or dynamically
      * determined. It cannot be both.
      */
     if (WARN_ON(new_driver->features && new_driver->get_features)) {
         pr_err("%s: features and get_features must not both be set\n",
                new_driver->name);
         return -EINVAL;
     }
 
     /* PHYLIB device drivers must not match using a DT compatible table
      * as this bypasses our checks that the mdiodev that is being matched
      * is backed by a struct phy_device. If such a case happens, we will
      * make out-of-bounds accesses and lockup in phydev->lock.
      */
     if (WARN(new_driver->mdiodrv.driver.of_match_table,
          "%s: driver must not provide a DT match table\n",
          new_driver->name))
         return -EINVAL;
 
     new_driver->mdiodrv.flags |= MDIO_DEVICE_IS_PHY;
     new_driver->mdiodrv.driver.name = new_driver->name;
     new_driver->mdiodrv.driver.bus = &mdio_bus_type;
     new_driver->mdiodrv.driver.probe = phy_probe;
     new_driver->mdiodrv.driver.remove = phy_remove;
     new_driver->mdiodrv.driver.shutdown = phy_shutdown;
     new_driver->mdiodrv.driver.owner = owner;
     new_driver->mdiodrv.driver.probe_type = PROBE_FORCE_SYNCHRONOUS;
 
     retval = driver_register(&new_driver->mdiodrv.driver);
     if (retval) {
         pr_err("%s: Error %d in registering driver\n",
                new_driver->name, retval);
 
         return retval;
     }
 
     pr_debug("%s: Registered new driver\n", new_driver->name);
 
     return 0;
 }
 EXPORT_SYMBOL(phy_driver_register);
 
 int phy_drivers_register(struct phy_driver *new_driver, int n,
              struct module *owner)
 {
     int i, ret = 0;
 
     for (i = 0; i < n; i++) {
         ret = phy_driver_register(new_driver + i, owner);
         if (ret) {
             while (i-- > 0)
                 phy_driver_unregister(new_driver + i);
             break;
         }
     }
     return ret;
 }
 EXPORT_SYMBOL(phy_drivers_register);
 
 void phy_driver_unregister(struct phy_driver *drv)
 {
     driver_unregister(&drv->mdiodrv.driver);
 }
 EXPORT_SYMBOL(phy_driver_unregister);
 
 void phy_drivers_unregister(struct phy_driver *drv, int n)
 {
     int i;
 
     for (i = 0; i < n; i++)
         phy_driver_unregister(drv + i);
 }
 EXPORT_SYMBOL(phy_drivers_unregister);
 
 static struct phy_driver genphy_driver = {
     .phy_id     = 0xffffffff,
     .phy_id_mask    = 0xffffffff,
     .name       = "Generic PHY",
     .get_features   = genphy_read_abilities,
     .suspend    = genphy_suspend,
     .resume     = genphy_resume,
     .set_loopback   = genphy_loopback,
 };
 
 static const struct ethtool_phy_ops phy_ethtool_phy_ops = {
     .get_sset_count     = phy_ethtool_get_sset_count,
     .get_strings        = phy_ethtool_get_strings,
     .get_stats      = phy_ethtool_get_stats,
     .start_cable_test   = phy_start_cable_test,
     .start_cable_test_tdr   = phy_start_cable_test_tdr,
 };
 
 static int __init phy_init(void)
 {
     int rc;
 
     rc = mdio_bus_init();
     if (rc)
         return rc;
 
     ethtool_set_ethtool_phy_ops(&phy_ethtool_phy_ops);
     features_init();
 
     rc = phy_driver_register(&genphy_c45_driver, THIS_MODULE);
     if (rc)
         goto err_c45;
 
     rc = phy_driver_register(&genphy_driver, THIS_MODULE);
     if (rc) {
         phy_driver_unregister(&genphy_c45_driver);
 err_c45:
         mdio_bus_exit();
     }
 
     return rc;
 }
 
 static void __exit phy_exit(void)
 {
     phy_driver_unregister(&genphy_c45_driver);
     phy_driver_unregister(&genphy_driver);
     mdio_bus_exit();
     ethtool_set_ethtool_phy_ops(NULL);
 }
 
 subsys_initcall(phy_init);
 module_exit(phy_exit);