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	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-or-later
 /*
  * phy-core.c  --  Generic Phy framework.
  *
  * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
  *
  * Author: Kishon Vijay Abraham I <kishon@ti.com>
  */
 
 #include <linux/kernel.h>
 #include <linux/export.h>
 #include <linux/module.h>
 #include <linux/err.h>
 #include <linux/device.h>
 #include <linux/slab.h>
 #include <linux/of.h>
 #include <linux/phy/phy.h>
 #include <linux/idr.h>
 #include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
 
 static struct class *phy_class;
 static DEFINE_MUTEX(phy_provider_mutex);
 static LIST_HEAD(phy_provider_list);
 static LIST_HEAD(phys);
 static DEFINE_IDA(phy_ida);
 
 static void devm_phy_release(struct device *dev, void *res)
 {
     struct phy *phy = *(struct phy **)res;
 
     phy_put(dev, phy);
 }
 
 static void devm_phy_provider_release(struct device *dev, void *res)
 {
     struct phy_provider *phy_provider = *(struct phy_provider **)res;
 
     of_phy_provider_unregister(phy_provider);
 }
 
 static void devm_phy_consume(struct device *dev, void *res)
 {
     struct phy *phy = *(struct phy **)res;
 
     phy_destroy(phy);
 }
 
 static int devm_phy_match(struct device *dev, void *res, void *match_data)
 {
     struct phy **phy = res;
 
     return *phy == match_data;
 }
 
 /**
  * phy_create_lookup() - allocate and register PHY/device association
  * @phy: the phy of the association
  * @con_id: connection ID string on device
  * @dev_id: the device of the association
  *
  * Creates and registers phy_lookup entry.
  */
 int phy_create_lookup(struct phy *phy, const char *con_id, const char *dev_id)
 {
     struct phy_lookup *pl;
 
     if (!phy || !dev_id || !con_id)
         return -EINVAL;
 
     pl = kzalloc(sizeof(*pl), GFP_KERNEL);
     if (!pl)
         return -ENOMEM;
 
     pl->dev_id = dev_id;
     pl->con_id = con_id;
     pl->phy = phy;
 
     mutex_lock(&phy_provider_mutex);
     list_add_tail(&pl->node, &phys);
     mutex_unlock(&phy_provider_mutex);
 
     return 0;
 }
 EXPORT_SYMBOL_GPL(phy_create_lookup);
 
 /**
  * phy_remove_lookup() - find and remove PHY/device association
  * @phy: the phy of the association
  * @con_id: connection ID string on device
  * @dev_id: the device of the association
  *
  * Finds and unregisters phy_lookup entry that was created with
  * phy_create_lookup().
  */
 void phy_remove_lookup(struct phy *phy, const char *con_id, const char *dev_id)
 {
     struct phy_lookup *pl;
 
     if (!phy || !dev_id || !con_id)
         return;
 
     mutex_lock(&phy_provider_mutex);
     list_for_each_entry(pl, &phys, node)
         if (pl->phy == phy && !strcmp(pl->dev_id, dev_id) &&
             !strcmp(pl->con_id, con_id)) {
             list_del(&pl->node);
             kfree(pl);
             break;
         }
     mutex_unlock(&phy_provider_mutex);
 }
 EXPORT_SYMBOL_GPL(phy_remove_lookup);
 
 static struct phy *phy_find(struct device *dev, const char *con_id)
 {
     const char *dev_id = dev_name(dev);
     struct phy_lookup *p, *pl = NULL;
 
     mutex_lock(&phy_provider_mutex);
     list_for_each_entry(p, &phys, node)
         if (!strcmp(p->dev_id, dev_id) && !strcmp(p->con_id, con_id)) {
             pl = p;
             break;
         }
     mutex_unlock(&phy_provider_mutex);
 
     return pl ? pl->phy : ERR_PTR(-ENODEV);
 }
 
 static struct phy_provider *of_phy_provider_lookup(struct device_node *node)
 {
     struct phy_provider *phy_provider;
     struct device_node *child;
 
     list_for_each_entry(phy_provider, &phy_provider_list, list) {
         if (phy_provider->dev->of_node == node)
             return phy_provider;
 
         for_each_child_of_node(phy_provider->children, child)
             if (child == node)
                 return phy_provider;
     }
 
     return ERR_PTR(-EPROBE_DEFER);
 }
 
 int phy_pm_runtime_get(struct phy *phy)
 {
     int ret;
 
     if (!phy)
         return 0;
 
     if (!pm_runtime_enabled(&phy->dev))
         return -ENOTSUPP;
 
     ret = pm_runtime_get(&phy->dev);
     if (ret < 0 && ret != -EINPROGRESS)
         pm_runtime_put_noidle(&phy->dev);
 
     return ret;
 }
 EXPORT_SYMBOL_GPL(phy_pm_runtime_get);
 
 int phy_pm_runtime_get_sync(struct phy *phy)
 {
     int ret;
 
     if (!phy)
         return 0;
 
     if (!pm_runtime_enabled(&phy->dev))
         return -ENOTSUPP;
 
     ret = pm_runtime_get_sync(&phy->dev);
     if (ret < 0)
         pm_runtime_put_sync(&phy->dev);
 
     return ret;
 }
 EXPORT_SYMBOL_GPL(phy_pm_runtime_get_sync);
 
 int phy_pm_runtime_put(struct phy *phy)
 {
     if (!phy)
         return 0;
 
     if (!pm_runtime_enabled(&phy->dev))
         return -ENOTSUPP;
 
     return pm_runtime_put(&phy->dev);
 }
 EXPORT_SYMBOL_GPL(phy_pm_runtime_put);
 
 int phy_pm_runtime_put_sync(struct phy *phy)
 {
     if (!phy)
         return 0;
 
     if (!pm_runtime_enabled(&phy->dev))
         return -ENOTSUPP;
 
     return pm_runtime_put_sync(&phy->dev);
 }
 EXPORT_SYMBOL_GPL(phy_pm_runtime_put_sync);
 
 void phy_pm_runtime_allow(struct phy *phy)
 {
     if (!phy)
         return;
 
     if (!pm_runtime_enabled(&phy->dev))
         return;
 
     pm_runtime_allow(&phy->dev);
 }
 EXPORT_SYMBOL_GPL(phy_pm_runtime_allow);
 
 void phy_pm_runtime_forbid(struct phy *phy)
 {
     if (!phy)
         return;
 
     if (!pm_runtime_enabled(&phy->dev))
         return;
 
     pm_runtime_forbid(&phy->dev);
 }
 EXPORT_SYMBOL_GPL(phy_pm_runtime_forbid);
 
 /**
  * phy_init - phy internal initialization before phy operation
  * @phy: the phy returned by phy_get()
  *
  * Used to allow phy's driver to perform phy internal initialization,
  * such as PLL block powering, clock initialization or anything that's
  * is required by the phy to perform the start of operation.
  * Must be called before phy_power_on().
  *
  * Return: %0 if successful, a negative error code otherwise
  */
 int phy_init(struct phy *phy)
 {
     int ret;
 
     if (!phy)
         return 0;
 
     ret = phy_pm_runtime_get_sync(phy);
     if (ret < 0 && ret != -ENOTSUPP)
         return ret;
     ret = 0; /* Override possible ret == -ENOTSUPP */
 
     mutex_lock(&phy->mutex);
     if (phy->power_count > phy->init_count)
         dev_warn(&phy->dev, "phy_power_on was called before phy_init\n");
 
     if (phy->init_count == 0 && phy->ops->init) {
         ret = phy->ops->init(phy);
         if (ret < 0) {
             dev_err(&phy->dev, "phy init failed --> %d\n", ret);
             goto out;
         }
     }
     ++phy->init_count;
 
 out:
     mutex_unlock(&phy->mutex);
     phy_pm_runtime_put(phy);
     return ret;
 }
 EXPORT_SYMBOL_GPL(phy_init);
 
 /**
  * phy_exit - Phy internal un-initialization
  * @phy: the phy returned by phy_get()
  *
  * Must be called after phy_power_off().
  *
  * Return: %0 if successful, a negative error code otherwise
  */
 int phy_exit(struct phy *phy)
 {
     int ret;
 
     if (!phy)
         return 0;
 
     ret = phy_pm_runtime_get_sync(phy);
     if (ret < 0 && ret != -ENOTSUPP)
         return ret;
     ret = 0; /* Override possible ret == -ENOTSUPP */
 
     mutex_lock(&phy->mutex);
     if (phy->init_count == 1 && phy->ops->exit) {
         ret = phy->ops->exit(phy);
         if (ret < 0) {
             dev_err(&phy->dev, "phy exit failed --> %d\n", ret);
             goto out;
         }
     }
     --phy->init_count;
 
 out:
     mutex_unlock(&phy->mutex);
     phy_pm_runtime_put(phy);
     return ret;
 }
 EXPORT_SYMBOL_GPL(phy_exit);
 
 /**
  * phy_power_on - Enable the phy and enter proper operation
  * @phy: the phy returned by phy_get()
  *
  * Must be called after phy_init().
  *
  * Return: %0 if successful, a negative error code otherwise
  */
 int phy_power_on(struct phy *phy)
 {
     int ret = 0;
 
     if (!phy)
         goto out;
 
     if (phy->pwr) {
         ret = regulator_enable(phy->pwr);
         if (ret)
             goto out;
     }
 
     ret = phy_pm_runtime_get_sync(phy);
     if (ret < 0 && ret != -ENOTSUPP)
         goto err_pm_sync;
 
     ret = 0; /* Override possible ret == -ENOTSUPP */
 
     mutex_lock(&phy->mutex);
     if (phy->power_count == 0 && phy->ops->power_on) {
         ret = phy->ops->power_on(phy);
         if (ret < 0) {
             dev_err(&phy->dev, "phy poweron failed --> %d\n", ret);
             goto err_pwr_on;
         }
     }
     ++phy->power_count;
     mutex_unlock(&phy->mutex);
     return 0;
 
 err_pwr_on:
     mutex_unlock(&phy->mutex);
     phy_pm_runtime_put_sync(phy);
 err_pm_sync:
     if (phy->pwr)
         regulator_disable(phy->pwr);
 out:
     return ret;
 }
 EXPORT_SYMBOL_GPL(phy_power_on);
 
 /**
  * phy_power_off - Disable the phy.
  * @phy: the phy returned by phy_get()
  *
  * Must be called before phy_exit().
  *
  * Return: %0 if successful, a negative error code otherwise
  */
 int phy_power_off(struct phy *phy)
 {
     int ret;
 
     if (!phy)
         return 0;
 
     mutex_lock(&phy->mutex);
     if (phy->power_count == 1 && phy->ops->power_off) {
         ret =  phy->ops->power_off(phy);
         if (ret < 0) {
             dev_err(&phy->dev, "phy poweroff failed --> %d\n", ret);
             mutex_unlock(&phy->mutex);
             return ret;
         }
     }
     --phy->power_count;
     mutex_unlock(&phy->mutex);
     phy_pm_runtime_put(phy);
 
     if (phy->pwr)
         regulator_disable(phy->pwr);
 
     return 0;
 }
 EXPORT_SYMBOL_GPL(phy_power_off);
 
 int phy_set_mode_ext(struct phy *phy, enum phy_mode mode, int submode)
 {
     int ret;
 
     if (!phy || !phy->ops->set_mode)
         return 0;
 
     mutex_lock(&phy->mutex);
     ret = phy->ops->set_mode(phy, mode, submode);
     if (!ret)
         phy->attrs.mode = mode;
     mutex_unlock(&phy->mutex);
 
     return ret;
 }
 EXPORT_SYMBOL_GPL(phy_set_mode_ext);
 
 int phy_set_media(struct phy *phy, enum phy_media media)
 {
     int ret;
 
     if (!phy || !phy->ops->set_media)
         return 0;
 
     mutex_lock(&phy->mutex);
     ret = phy->ops->set_media(phy, media);
     mutex_unlock(&phy->mutex);
 
     return ret;
 }
 EXPORT_SYMBOL_GPL(phy_set_media);
 
 int phy_set_speed(struct phy *phy, int speed)
 {
     int ret;
 
     if (!phy || !phy->ops->set_speed)
         return 0;
 
     mutex_lock(&phy->mutex);
     ret = phy->ops->set_speed(phy, speed);
     mutex_unlock(&phy->mutex);
 
     return ret;
 }
 EXPORT_SYMBOL_GPL(phy_set_speed);
 
 int phy_reset(struct phy *phy)
 {
     int ret;
 
     if (!phy || !phy->ops->reset)
         return 0;
 
     ret = phy_pm_runtime_get_sync(phy);
     if (ret < 0 && ret != -ENOTSUPP)
         return ret;
 
     mutex_lock(&phy->mutex);
     ret = phy->ops->reset(phy);
     mutex_unlock(&phy->mutex);
 
     phy_pm_runtime_put(phy);
 
     return ret;
 }
 EXPORT_SYMBOL_GPL(phy_reset);
 
 /**
  * phy_calibrate() - Tunes the phy hw parameters for current configuration
  * @phy: the phy returned by phy_get()
  *
  * Used to calibrate phy hardware, typically by adjusting some parameters in
  * runtime, which are otherwise lost after host controller reset and cannot
  * be applied in phy_init() or phy_power_on().
  *
  * Return: %0 if successful, a negative error code otherwise
  */
 int phy_calibrate(struct phy *phy)
 {
     int ret;
 
     if (!phy || !phy->ops->calibrate)
         return 0;
 
     mutex_lock(&phy->mutex);
     ret = phy->ops->calibrate(phy);
     mutex_unlock(&phy->mutex);
 
     return ret;
 }
 EXPORT_SYMBOL_GPL(phy_calibrate);
 
 /**
  * phy_configure() - Changes the phy parameters
  * @phy: the phy returned by phy_get()
  * @opts: New configuration to apply
  *
  * Used to change the PHY parameters. phy_init() must have been called
  * on the phy. The configuration will be applied on the current phy
  * mode, that can be changed using phy_set_mode().
  *
  * Return: %0 if successful, a negative error code otherwise
  */
 int phy_configure(struct phy *phy, union phy_configure_opts *opts)
 {
     int ret;
 
     if (!phy)
         return -EINVAL;
 
     if (!phy->ops->configure)
         return -EOPNOTSUPP;
 
     mutex_lock(&phy->mutex);
     ret = phy->ops->configure(phy, opts);
     mutex_unlock(&phy->mutex);
 
     return ret;
 }
 EXPORT_SYMBOL_GPL(phy_configure);
 
 /**
  * phy_validate() - Checks the phy parameters
  * @phy: the phy returned by phy_get()
  * @mode: phy_mode the configuration is applicable to.
  * @submode: PHY submode the configuration is applicable to.
  * @opts: Configuration to check
  *
  * Used to check that the current set of parameters can be handled by
  * the phy. Implementations are free to tune the parameters passed as
  * arguments if needed by some implementation detail or
  * constraints. It will not change any actual configuration of the
  * PHY, so calling it as many times as deemed fit will have no side
  * effect.
  *
  * Return: %0 if successful, a negative error code otherwise
  */
 int phy_validate(struct phy *phy, enum phy_mode mode, int submode,
          union phy_configure_opts *opts)
 {
     int ret;
 
     if (!phy)
         return -EINVAL;
 
     if (!phy->ops->validate)
         return -EOPNOTSUPP;
 
     mutex_lock(&phy->mutex);
     ret = phy->ops->validate(phy, mode, submode, opts);
     mutex_unlock(&phy->mutex);
 
     return ret;
 }
 EXPORT_SYMBOL_GPL(phy_validate);
 
 /**
  * _of_phy_get() - lookup and obtain a reference to a phy by phandle
  * @np: device_node for which to get the phy
  * @index: the index of the phy
  *
  * Returns the phy associated with the given phandle value,
  * after getting a refcount to it or -ENODEV if there is no such phy or
  * -EPROBE_DEFER if there is a phandle to the phy, but the device is
  * not yet loaded. This function uses of_xlate call back function provided
  * while registering the phy_provider to find the phy instance.
  */
 static struct phy *_of_phy_get(struct device_node *np, int index)
 {
     int ret;
     struct phy_provider *phy_provider;
     struct phy *phy = NULL;
     struct of_phandle_args args;
 
     ret = of_parse_phandle_with_args(np, "phys", "#phy-cells",
         index, &args);
     if (ret)
         return ERR_PTR(-ENODEV);
 
     /* This phy type handled by the usb-phy subsystem for now */
     if (of_device_is_compatible(args.np, "usb-nop-xceiv"))
         return ERR_PTR(-ENODEV);
 
     mutex_lock(&phy_provider_mutex);
     phy_provider = of_phy_provider_lookup(args.np);
     if (IS_ERR(phy_provider) || !try_module_get(phy_provider->owner)) {
         phy = ERR_PTR(-EPROBE_DEFER);
         goto out_unlock;
     }
 
     if (!of_device_is_available(args.np)) {
         dev_warn(phy_provider->dev, "Requested PHY is disabled\n");
         phy = ERR_PTR(-ENODEV);
         goto out_put_module;
     }
 
     phy = phy_provider->of_xlate(phy_provider->dev, &args);
 
 out_put_module:
     module_put(phy_provider->owner);
 
 out_unlock:
     mutex_unlock(&phy_provider_mutex);
     of_node_put(args.np);
 
     return phy;
 }
 
 /**
  * of_phy_get() - lookup and obtain a reference to a phy using a device_node.
  * @np: device_node for which to get the phy
  * @con_id: name of the phy from device's point of view
  *
  * Returns the phy driver, after getting a refcount to it; or
  * -ENODEV if there is no such phy. The caller is responsible for
  * calling phy_put() to release that count.
  */
 struct phy *of_phy_get(struct device_node *np, const char *con_id)
 {
     struct phy *phy = NULL;
     int index = 0;
 
     if (con_id)
         index = of_property_match_string(np, "phy-names", con_id);
 
     phy = _of_phy_get(np, index);
     if (IS_ERR(phy))
         return phy;
 
     if (!try_module_get(phy->ops->owner))
         return ERR_PTR(-EPROBE_DEFER);
 
     get_device(&phy->dev);
 
     return phy;
 }
 EXPORT_SYMBOL_GPL(of_phy_get);
 
 /**
  * of_phy_put() - release the PHY
  * @phy: the phy returned by of_phy_get()
  *
  * Releases a refcount the caller received from of_phy_get().
  */
 void of_phy_put(struct phy *phy)
 {
     if (!phy || IS_ERR(phy))
         return;
 
     mutex_lock(&phy->mutex);
     if (phy->ops->release)
         phy->ops->release(phy);
     mutex_unlock(&phy->mutex);
 
     module_put(phy->ops->owner);
     put_device(&phy->dev);
 }
 EXPORT_SYMBOL_GPL(of_phy_put);
 
 /**
  * phy_put() - release the PHY
  * @dev: device that wants to release this phy
  * @phy: the phy returned by phy_get()
  *
  * Releases a refcount the caller received from phy_get().
  */
 void phy_put(struct device *dev, struct phy *phy)
 {
     device_link_remove(dev, &phy->dev);
     of_phy_put(phy);
 }
 EXPORT_SYMBOL_GPL(phy_put);
 
 /**
  * devm_phy_put() - release the PHY
  * @dev: device that wants to release this phy
  * @phy: the phy returned by devm_phy_get()
  *
  * destroys the devres associated with this phy and invokes phy_put
  * to release the phy.
  */
 void devm_phy_put(struct device *dev, struct phy *phy)
 {
     int r;
 
     if (!phy)
         return;
 
     r = devres_destroy(dev, devm_phy_release, devm_phy_match, phy);
     dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
 }
 EXPORT_SYMBOL_GPL(devm_phy_put);
 
 /**
  * of_phy_simple_xlate() - returns the phy instance from phy provider
  * @dev: the PHY provider device
  * @args: of_phandle_args (not used here)
  *
  * Intended to be used by phy provider for the common case where #phy-cells is
  * 0. For other cases where #phy-cells is greater than '0', the phy provider
  * should provide a custom of_xlate function that reads the *args* and returns
  * the appropriate phy.
  */
 struct phy *of_phy_simple_xlate(struct device *dev, struct of_phandle_args
     *args)
 {
     struct phy *phy;
     struct class_dev_iter iter;
 
     class_dev_iter_init(&iter, phy_class, NULL, NULL);
     while ((dev = class_dev_iter_next(&iter))) {
         phy = to_phy(dev);
         if (args->np != phy->dev.of_node)
             continue;
 
         class_dev_iter_exit(&iter);
         return phy;
     }
 
     class_dev_iter_exit(&iter);
     return ERR_PTR(-ENODEV);
 }
 EXPORT_SYMBOL_GPL(of_phy_simple_xlate);
 
 /**
  * phy_get() - lookup and obtain a reference to a phy.
  * @dev: device that requests this phy
  * @string: the phy name as given in the dt data or the name of the controller
  * port for non-dt case
  *
  * Returns the phy driver, after getting a refcount to it; or
  * -ENODEV if there is no such phy.  The caller is responsible for
  * calling phy_put() to release that count.
  */
 struct phy *phy_get(struct device *dev, const char *string)
 {
     int index = 0;
     struct phy *phy;
     struct device_link *link;
 
     if (dev->of_node) {
         if (string)
             index = of_property_match_string(dev->of_node, "phy-names",
                 string);
         else
             index = 0;
         phy = _of_phy_get(dev->of_node, index);
     } else {
         if (string == NULL) {
             dev_WARN(dev, "missing string\n");
             return ERR_PTR(-EINVAL);
         }
         phy = phy_find(dev, string);
     }
     if (IS_ERR(phy))
         return phy;
 
     if (!try_module_get(phy->ops->owner))
         return ERR_PTR(-EPROBE_DEFER);
 
     get_device(&phy->dev);
 
     link = device_link_add(dev, &phy->dev, DL_FLAG_STATELESS);
     if (!link)
         dev_dbg(dev, "failed to create device link to %s\n",
             dev_name(phy->dev.parent));
 
     return phy;
 }
 EXPORT_SYMBOL_GPL(phy_get);
 
 /**
  * phy_optional_get() - lookup and obtain a reference to an optional phy.
  * @dev: device that requests this phy
  * @string: the phy name as given in the dt data or the name of the controller
  * port for non-dt case
  *
  * Returns the phy driver, after getting a refcount to it; or
  * NULL if there is no such phy.  The caller is responsible for
  * calling phy_put() to release that count.
  */
 struct phy *phy_optional_get(struct device *dev, const char *string)
 {
     struct phy *phy = phy_get(dev, string);
 
     if (PTR_ERR(phy) == -ENODEV)
         phy = NULL;
 
     return phy;
 }
 EXPORT_SYMBOL_GPL(phy_optional_get);
 
 /**
  * devm_phy_get() - lookup and obtain a reference to a phy.
  * @dev: device that requests this phy
  * @string: the phy name as given in the dt data or phy device name
  * for non-dt case
  *
  * Gets the phy using phy_get(), and associates a device with it using
  * devres. On driver detach, release function is invoked on the devres data,
  * then, devres data is freed.
  */
 struct phy *devm_phy_get(struct device *dev, const char *string)
 {
     struct phy **ptr, *phy;
 
     ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
     if (!ptr)
         return ERR_PTR(-ENOMEM);
 
     phy = phy_get(dev, string);
     if (!IS_ERR(phy)) {
         *ptr = phy;
         devres_add(dev, ptr);
     } else {
         devres_free(ptr);
     }
 
     return phy;
 }
 EXPORT_SYMBOL_GPL(devm_phy_get);
 
 /**
  * devm_phy_optional_get() - lookup and obtain a reference to an optional phy.
  * @dev: device that requests this phy
  * @string: the phy name as given in the dt data or phy device name
  * for non-dt case
  *
  * Gets the phy using phy_get(), and associates a device with it using
  * devres. On driver detach, release function is invoked on the devres
  * data, then, devres data is freed. This differs to devm_phy_get() in
  * that if the phy does not exist, it is not considered an error and
  * -ENODEV will not be returned. Instead the NULL phy is returned,
  * which can be passed to all other phy consumer calls.
  */
 struct phy *devm_phy_optional_get(struct device *dev, const char *string)
 {
     struct phy *phy = devm_phy_get(dev, string);
 
     if (PTR_ERR(phy) == -ENODEV)
         phy = NULL;
 
     return phy;
 }
 EXPORT_SYMBOL_GPL(devm_phy_optional_get);
 
 /**
  * devm_of_phy_get() - lookup and obtain a reference to a phy.
  * @dev: device that requests this phy
  * @np: node containing the phy
  * @con_id: name of the phy from device's point of view
  *
  * Gets the phy using of_phy_get(), and associates a device with it using
  * devres. On driver detach, release function is invoked on the devres data,
  * then, devres data is freed.
  */
 struct phy *devm_of_phy_get(struct device *dev, struct device_node *np,
                 const char *con_id)
 {
     struct phy **ptr, *phy;
     struct device_link *link;
 
     ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
     if (!ptr)
         return ERR_PTR(-ENOMEM);
 
     phy = of_phy_get(np, con_id);
     if (!IS_ERR(phy)) {
         *ptr = phy;
         devres_add(dev, ptr);
     } else {
         devres_free(ptr);
         return phy;
     }
 
     link = device_link_add(dev, &phy->dev, DL_FLAG_STATELESS);
     if (!link)
         dev_dbg(dev, "failed to create device link to %s\n",
             dev_name(phy->dev.parent));
 
     return phy;
 }
 EXPORT_SYMBOL_GPL(devm_of_phy_get);
 
 /**
  * devm_of_phy_get_by_index() - lookup and obtain a reference to a phy by index.
  * @dev: device that requests this phy
  * @np: node containing the phy
  * @index: index of the phy
  *
  * Gets the phy using _of_phy_get(), then gets a refcount to it,
  * and associates a device with it using devres. On driver detach,
  * release function is invoked on the devres data,
  * then, devres data is freed.
  *
  */
 struct phy *devm_of_phy_get_by_index(struct device *dev, struct device_node *np,
                      int index)
 {
     struct phy **ptr, *phy;
     struct device_link *link;
 
     ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
     if (!ptr)
         return ERR_PTR(-ENOMEM);
 
     phy = _of_phy_get(np, index);
     if (IS_ERR(phy)) {
         devres_free(ptr);
         return phy;
     }
 
     if (!try_module_get(phy->ops->owner)) {
         devres_free(ptr);
         return ERR_PTR(-EPROBE_DEFER);
     }
 
     get_device(&phy->dev);
 
     *ptr = phy;
     devres_add(dev, ptr);
 
     link = device_link_add(dev, &phy->dev, DL_FLAG_STATELESS);
     if (!link)
         dev_dbg(dev, "failed to create device link to %s\n",
             dev_name(phy->dev.parent));
 
     return phy;
 }
 EXPORT_SYMBOL_GPL(devm_of_phy_get_by_index);
 
 /**
  * phy_create() - create a new phy
  * @dev: device that is creating the new phy
  * @node: device node of the phy
  * @ops: function pointers for performing phy operations
  *
  * Called to create a phy using phy framework.
  */
 struct phy *phy_create(struct device *dev, struct device_node *node,
                const struct phy_ops *ops)
 {
     int ret;
     int id;
     struct phy *phy;
 
     if (WARN_ON(!dev))
         return ERR_PTR(-EINVAL);
 
     phy = kzalloc(sizeof(*phy), GFP_KERNEL);
     if (!phy)
         return ERR_PTR(-ENOMEM);
 
     id = ida_simple_get(&phy_ida, 0, 0, GFP_KERNEL);
     if (id < 0) {
         dev_err(dev, "unable to get id\n");
         ret = id;
         goto free_phy;
     }
 
     device_initialize(&phy->dev);
     mutex_init(&phy->mutex);
 
     phy->dev.class = phy_class;
     phy->dev.parent = dev;
     phy->dev.of_node = node ?: dev->of_node;
     phy->id = id;
     phy->ops = ops;
 
     ret = dev_set_name(&phy->dev, "phy-%s.%d", dev_name(dev), id);
     if (ret)
         goto put_dev;
 
     /* phy-supply */
     phy->pwr = regulator_get_optional(&phy->dev, "phy");
     if (IS_ERR(phy->pwr)) {
         ret = PTR_ERR(phy->pwr);
         if (ret == -EPROBE_DEFER)
             goto put_dev;
 
         phy->pwr = NULL;
     }
 
     ret = device_add(&phy->dev);
     if (ret)
         goto put_dev;
 
     if (pm_runtime_enabled(dev)) {
         pm_runtime_enable(&phy->dev);
         pm_runtime_no_callbacks(&phy->dev);
     }
 
     return phy;
 
 put_dev:
     put_device(&phy->dev);  /* calls phy_release() which frees resources */
     return ERR_PTR(ret);
 
 free_phy:
     kfree(phy);
     return ERR_PTR(ret);
 }
 EXPORT_SYMBOL_GPL(phy_create);
 
 /**
  * devm_phy_create() - create a new phy
  * @dev: device that is creating the new phy
  * @node: device node of the phy
  * @ops: function pointers for performing phy operations
  *
  * Creates a new PHY device adding it to the PHY class.
  * While at that, it also associates the device with the phy using devres.
  * On driver detach, release function is invoked on the devres data,
  * then, devres data is freed.
  */
 struct phy *devm_phy_create(struct device *dev, struct device_node *node,
                 const struct phy_ops *ops)
 {
     struct phy **ptr, *phy;
 
     ptr = devres_alloc(devm_phy_consume, sizeof(*ptr), GFP_KERNEL);
     if (!ptr)
         return ERR_PTR(-ENOMEM);
 
     phy = phy_create(dev, node, ops);
     if (!IS_ERR(phy)) {
         *ptr = phy;
         devres_add(dev, ptr);
     } else {
         devres_free(ptr);
     }
 
     return phy;
 }
 EXPORT_SYMBOL_GPL(devm_phy_create);
 
 /**
  * phy_destroy() - destroy the phy
  * @phy: the phy to be destroyed
  *
  * Called to destroy the phy.
  */
 void phy_destroy(struct phy *phy)
 {
     pm_runtime_disable(&phy->dev);
     device_unregister(&phy->dev);
 }
 EXPORT_SYMBOL_GPL(phy_destroy);
 
 /**
  * devm_phy_destroy() - destroy the PHY
  * @dev: device that wants to release this phy
  * @phy: the phy returned by devm_phy_get()
  *
  * destroys the devres associated with this phy and invokes phy_destroy
  * to destroy the phy.
  */
 void devm_phy_destroy(struct device *dev, struct phy *phy)
 {
     int r;
 
     r = devres_destroy(dev, devm_phy_consume, devm_phy_match, phy);
     dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
 }
 EXPORT_SYMBOL_GPL(devm_phy_destroy);
 
 /**
  * __of_phy_provider_register() - create/register phy provider with the framework
  * @dev: struct device of the phy provider
  * @children: device node containing children (if different from dev->of_node)
  * @owner: the module owner containing of_xlate
  * @of_xlate: function pointer to obtain phy instance from phy provider
  *
  * Creates struct phy_provider from dev and of_xlate function pointer.
  * This is used in the case of dt boot for finding the phy instance from
  * phy provider.
  *
  * If the PHY provider doesn't nest children directly but uses a separate
  * child node to contain the individual children, the @children parameter
  * can be used to override the default. If NULL, the default (dev->of_node)
  * will be used. If non-NULL, the device node must be a child (or further
  * descendant) of dev->of_node. Otherwise an ERR_PTR()-encoded -EINVAL
  * error code is returned.
  */
 struct phy_provider *__of_phy_provider_register(struct device *dev,
     struct device_node *children, struct module *owner,
     struct phy * (*of_xlate)(struct device *dev,
                  struct of_phandle_args *args))
 {
     struct phy_provider *phy_provider;
 
     /*
      * If specified, the device node containing the children must itself
      * be the provider's device node or a child (or further descendant)
      * thereof.
      */
     if (children) {
         struct device_node *parent = of_node_get(children), *next;
 
         while (parent) {
             if (parent == dev->of_node)
                 break;
 
             next = of_get_parent(parent);
             of_node_put(parent);
             parent = next;
         }
 
         if (!parent)
             return ERR_PTR(-EINVAL);
 
         of_node_put(parent);
     } else {
         children = dev->of_node;
     }
 
     phy_provider = kzalloc(sizeof(*phy_provider), GFP_KERNEL);
     if (!phy_provider)
         return ERR_PTR(-ENOMEM);
 
     phy_provider->dev = dev;
     phy_provider->children = of_node_get(children);
     phy_provider->owner = owner;
     phy_provider->of_xlate = of_xlate;
 
     mutex_lock(&phy_provider_mutex);
     list_add_tail(&phy_provider->list, &phy_provider_list);
     mutex_unlock(&phy_provider_mutex);
 
     return phy_provider;
 }
 EXPORT_SYMBOL_GPL(__of_phy_provider_register);
 
 /**
  * __devm_of_phy_provider_register() - create/register phy provider with the
  * framework
  * @dev: struct device of the phy provider
  * @children: device node containing children (if different from dev->of_node)
  * @owner: the module owner containing of_xlate
  * @of_xlate: function pointer to obtain phy instance from phy provider
  *
  * Creates struct phy_provider from dev and of_xlate function pointer.
  * This is used in the case of dt boot for finding the phy instance from
  * phy provider. While at that, it also associates the device with the
  * phy provider using devres. On driver detach, release function is invoked
  * on the devres data, then, devres data is freed.
  */
 struct phy_provider *__devm_of_phy_provider_register(struct device *dev,
     struct device_node *children, struct module *owner,
     struct phy * (*of_xlate)(struct device *dev,
                  struct of_phandle_args *args))
 {
     struct phy_provider **ptr, *phy_provider;
 
     ptr = devres_alloc(devm_phy_provider_release, sizeof(*ptr), GFP_KERNEL);
     if (!ptr)
         return ERR_PTR(-ENOMEM);
 
     phy_provider = __of_phy_provider_register(dev, children, owner,
                           of_xlate);
     if (!IS_ERR(phy_provider)) {
         *ptr = phy_provider;
         devres_add(dev, ptr);
     } else {
         devres_free(ptr);
     }
 
     return phy_provider;
 }
 EXPORT_SYMBOL_GPL(__devm_of_phy_provider_register);
 
 /**
  * of_phy_provider_unregister() - unregister phy provider from the framework
  * @phy_provider: phy provider returned by of_phy_provider_register()
  *
  * Removes the phy_provider created using of_phy_provider_register().
  */
 void of_phy_provider_unregister(struct phy_provider *phy_provider)
 {
     if (IS_ERR(phy_provider))
         return;
 
     mutex_lock(&phy_provider_mutex);
     list_del(&phy_provider->list);
     of_node_put(phy_provider->children);
     kfree(phy_provider);
     mutex_unlock(&phy_provider_mutex);
 }
 EXPORT_SYMBOL_GPL(of_phy_provider_unregister);
 
 /**
  * devm_of_phy_provider_unregister() - remove phy provider from the framework
  * @dev: struct device of the phy provider
  * @phy_provider: phy provider returned by of_phy_provider_register()
  *
  * destroys the devres associated with this phy provider and invokes
  * of_phy_provider_unregister to unregister the phy provider.
  */
 void devm_of_phy_provider_unregister(struct device *dev,
     struct phy_provider *phy_provider)
 {
     int r;
 
     r = devres_destroy(dev, devm_phy_provider_release, devm_phy_match,
         phy_provider);
     dev_WARN_ONCE(dev, r, "couldn't find PHY provider device resource\n");
 }
 EXPORT_SYMBOL_GPL(devm_of_phy_provider_unregister);
 
 /**
  * phy_release() - release the phy
  * @dev: the dev member within phy
  *
  * When the last reference to the device is removed, it is called
  * from the embedded kobject as release method.
  */
 static void phy_release(struct device *dev)
 {
     struct phy *phy;
 
     phy = to_phy(dev);
     dev_vdbg(dev, "releasing '%s'\n", dev_name(dev));
     regulator_put(phy->pwr);
     ida_simple_remove(&phy_ida, phy->id);
     kfree(phy);
 }
 
 static int __init phy_core_init(void)
 {
     phy_class = class_create(THIS_MODULE, "phy");
     if (IS_ERR(phy_class)) {
         pr_err("failed to create phy class --> %ld\n",
             PTR_ERR(phy_class));
         return PTR_ERR(phy_class);
     }
 
     phy_class->dev_release = phy_release;
 
     return 0;
 }
 device_initcall(phy_core_init);

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