OSCL-LXR linux-6.0.1/​drivers/​opp/​of.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-only
 /*
  * Generic OPP OF helpers
  *
  * Copyright (C) 2009-2010 Texas Instruments Incorporated.
  *  Nishanth Menon
  *  Romit Dasgupta
  *  Kevin Hilman
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/cpu.h>
 #include <linux/errno.h>
 #include <linux/device.h>
 #include <linux/of_device.h>
 #include <linux/pm_domain.h>
 #include <linux/slab.h>
 #include <linux/export.h>
 #include <linux/energy_model.h>
 
 #include "opp.h"
 
 /*
  * Returns opp descriptor node for a device node, caller must
  * do of_node_put().
  */
 static struct device_node *_opp_of_get_opp_desc_node(struct device_node *np,
                              int index)
 {
     /* "operating-points-v2" can be an array for power domain providers */
     return of_parse_phandle(np, "operating-points-v2", index);
 }
 
 /* Returns opp descriptor node for a device, caller must do of_node_put() */
 struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev)
 {
     return _opp_of_get_opp_desc_node(dev->of_node, 0);
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_opp_desc_node);
 
 struct opp_table *_managed_opp(struct device *dev, int index)
 {
     struct opp_table *opp_table, *managed_table = NULL;
     struct device_node *np;
 
     np = _opp_of_get_opp_desc_node(dev->of_node, index);
     if (!np)
         return NULL;
 
     list_for_each_entry(opp_table, &opp_tables, node) {
         if (opp_table->np == np) {
             /*
              * Multiple devices can point to the same OPP table and
              * so will have same node-pointer, np.
              *
              * But the OPPs will be considered as shared only if the
              * OPP table contains a "opp-shared" property.
              */
             if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) {
                 _get_opp_table_kref(opp_table);
                 managed_table = opp_table;
             }
 
             break;
         }
     }
 
     of_node_put(np);
 
     return managed_table;
 }
 
 /* The caller must call dev_pm_opp_put() after the OPP is used */
 static struct dev_pm_opp *_find_opp_of_np(struct opp_table *opp_table,
                       struct device_node *opp_np)
 {
     struct dev_pm_opp *opp;
 
     mutex_lock(&opp_table->lock);
 
     list_for_each_entry(opp, &opp_table->opp_list, node) {
         if (opp->np == opp_np) {
             dev_pm_opp_get(opp);
             mutex_unlock(&opp_table->lock);
             return opp;
         }
     }
 
     mutex_unlock(&opp_table->lock);
 
     return NULL;
 }
 
 static struct device_node *of_parse_required_opp(struct device_node *np,
                          int index)
 {
     return of_parse_phandle(np, "required-opps", index);
 }
 
 /* The caller must call dev_pm_opp_put_opp_table() after the table is used */
 static struct opp_table *_find_table_of_opp_np(struct device_node *opp_np)
 {
     struct opp_table *opp_table;
     struct device_node *opp_table_np;
 
     opp_table_np = of_get_parent(opp_np);
     if (!opp_table_np)
         goto err;
 
     /* It is safe to put the node now as all we need now is its address */
     of_node_put(opp_table_np);
 
     mutex_lock(&opp_table_lock);
     list_for_each_entry(opp_table, &opp_tables, node) {
         if (opp_table_np == opp_table->np) {
             _get_opp_table_kref(opp_table);
             mutex_unlock(&opp_table_lock);
             return opp_table;
         }
     }
     mutex_unlock(&opp_table_lock);
 
 err:
     return ERR_PTR(-ENODEV);
 }
 
 /* Free resources previously acquired by _opp_table_alloc_required_tables() */
 static void _opp_table_free_required_tables(struct opp_table *opp_table)
 {
     struct opp_table **required_opp_tables = opp_table->required_opp_tables;
     int i;
 
     if (!required_opp_tables)
         return;
 
     for (i = 0; i < opp_table->required_opp_count; i++) {
         if (IS_ERR_OR_NULL(required_opp_tables[i]))
             continue;
 
         dev_pm_opp_put_opp_table(required_opp_tables[i]);
     }
 
     kfree(required_opp_tables);
 
     opp_table->required_opp_count = 0;
     opp_table->required_opp_tables = NULL;
     list_del(&opp_table->lazy);
 }
 
 /*
  * Populate all devices and opp tables which are part of "required-opps" list.
  * Checking only the first OPP node should be enough.
  */
 static void _opp_table_alloc_required_tables(struct opp_table *opp_table,
                          struct device *dev,
                          struct device_node *opp_np)
 {
     struct opp_table **required_opp_tables;
     struct device_node *required_np, *np;
     bool lazy = false;
     int count, i;
 
     /* Traversing the first OPP node is all we need */
     np = of_get_next_available_child(opp_np, NULL);
     if (!np) {
         dev_warn(dev, "Empty OPP table\n");
 
         return;
     }
 
     count = of_count_phandle_with_args(np, "required-opps", NULL);
     if (count <= 0)
         goto put_np;
 
     required_opp_tables = kcalloc(count, sizeof(*required_opp_tables),
                       GFP_KERNEL);
     if (!required_opp_tables)
         goto put_np;
 
     opp_table->required_opp_tables = required_opp_tables;
     opp_table->required_opp_count = count;
 
     for (i = 0; i < count; i++) {
         required_np = of_parse_required_opp(np, i);
         if (!required_np)
             goto free_required_tables;
 
         required_opp_tables[i] = _find_table_of_opp_np(required_np);
         of_node_put(required_np);
 
         if (IS_ERR(required_opp_tables[i]))
             lazy = true;
     }
 
     /* Let's do the linking later on */
     if (lazy)
         list_add(&opp_table->lazy, &lazy_opp_tables);
 
     goto put_np;
 
 free_required_tables:
     _opp_table_free_required_tables(opp_table);
 put_np:
     of_node_put(np);
 }
 
 void _of_init_opp_table(struct opp_table *opp_table, struct device *dev,
             int index)
 {
     struct device_node *np, *opp_np;
     u32 val;
 
     /*
      * Only required for backward compatibility with v1 bindings, but isn't
      * harmful for other cases. And so we do it unconditionally.
      */
     np = of_node_get(dev->of_node);
     if (!np)
         return;
 
     if (!of_property_read_u32(np, "clock-latency", &val))
         opp_table->clock_latency_ns_max = val;
     of_property_read_u32(np, "voltage-tolerance",
                  &opp_table->voltage_tolerance_v1);
 
     if (of_find_property(np, "#power-domain-cells", NULL))
         opp_table->is_genpd = true;
 
     /* Get OPP table node */
     opp_np = _opp_of_get_opp_desc_node(np, index);
     of_node_put(np);
 
     if (!opp_np)
         return;
 
     if (of_property_read_bool(opp_np, "opp-shared"))
         opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED;
     else
         opp_table->shared_opp = OPP_TABLE_ACCESS_EXCLUSIVE;
 
     opp_table->np = opp_np;
 
     _opp_table_alloc_required_tables(opp_table, dev, opp_np);
 }
 
 void _of_clear_opp_table(struct opp_table *opp_table)
 {
     _opp_table_free_required_tables(opp_table);
     of_node_put(opp_table->np);
 }
 
 /*
  * Release all resources previously acquired with a call to
  * _of_opp_alloc_required_opps().
  */
 static void _of_opp_free_required_opps(struct opp_table *opp_table,
                        struct dev_pm_opp *opp)
 {
     struct dev_pm_opp **required_opps = opp->required_opps;
     int i;
 
     if (!required_opps)
         return;
 
     for (i = 0; i < opp_table->required_opp_count; i++) {
         if (!required_opps[i])
             continue;
 
         /* Put the reference back */
         dev_pm_opp_put(required_opps[i]);
     }
 
     opp->required_opps = NULL;
     kfree(required_opps);
 }
 
 void _of_clear_opp(struct opp_table *opp_table, struct dev_pm_opp *opp)
 {
     _of_opp_free_required_opps(opp_table, opp);
     of_node_put(opp->np);
 }
 
 /* Populate all required OPPs which are part of "required-opps" list */
 static int _of_opp_alloc_required_opps(struct opp_table *opp_table,
                        struct dev_pm_opp *opp)
 {
     struct dev_pm_opp **required_opps;
     struct opp_table *required_table;
     struct device_node *np;
     int i, ret, count = opp_table->required_opp_count;
 
     if (!count)
         return 0;
 
     required_opps = kcalloc(count, sizeof(*required_opps), GFP_KERNEL);
     if (!required_opps)
         return -ENOMEM;
 
     opp->required_opps = required_opps;
 
     for (i = 0; i < count; i++) {
         required_table = opp_table->required_opp_tables[i];
 
         /* Required table not added yet, we will link later */
         if (IS_ERR_OR_NULL(required_table))
             continue;
 
         np = of_parse_required_opp(opp->np, i);
         if (unlikely(!np)) {
             ret = -ENODEV;
             goto free_required_opps;
         }
 
         required_opps[i] = _find_opp_of_np(required_table, np);
         of_node_put(np);
 
         if (!required_opps[i]) {
             pr_err("%s: Unable to find required OPP node: %pOF (%d)\n",
                    __func__, opp->np, i);
             ret = -ENODEV;
             goto free_required_opps;
         }
     }
 
     return 0;
 
 free_required_opps:
     _of_opp_free_required_opps(opp_table, opp);
 
     return ret;
 }
 
 /* Link required OPPs for an individual OPP */
 static int lazy_link_required_opps(struct opp_table *opp_table,
                    struct opp_table *new_table, int index)
 {
     struct device_node *required_np;
     struct dev_pm_opp *opp;
 
     list_for_each_entry(opp, &opp_table->opp_list, node) {
         required_np = of_parse_required_opp(opp->np, index);
         if (unlikely(!required_np))
             return -ENODEV;
 
         opp->required_opps[index] = _find_opp_of_np(new_table, required_np);
         of_node_put(required_np);
 
         if (!opp->required_opps[index]) {
             pr_err("%s: Unable to find required OPP node: %pOF (%d)\n",
                    __func__, opp->np, index);
             return -ENODEV;
         }
     }
 
     return 0;
 }
 
 /* Link required OPPs for all OPPs of the newly added OPP table */
 static void lazy_link_required_opp_table(struct opp_table *new_table)
 {
     struct opp_table *opp_table, *temp, **required_opp_tables;
     struct device_node *required_np, *opp_np, *required_table_np;
     struct dev_pm_opp *opp;
     int i, ret;
 
     mutex_lock(&opp_table_lock);
 
     list_for_each_entry_safe(opp_table, temp, &lazy_opp_tables, lazy) {
         bool lazy = false;
 
         /* opp_np can't be invalid here */
         opp_np = of_get_next_available_child(opp_table->np, NULL);
 
         for (i = 0; i < opp_table->required_opp_count; i++) {
             required_opp_tables = opp_table->required_opp_tables;
 
             /* Required opp-table is already parsed */
             if (!IS_ERR(required_opp_tables[i]))
                 continue;
 
             /* required_np can't be invalid here */
             required_np = of_parse_required_opp(opp_np, i);
             required_table_np = of_get_parent(required_np);
 
             of_node_put(required_table_np);
             of_node_put(required_np);
 
             /*
              * Newly added table isn't the required opp-table for
              * opp_table.
              */
             if (required_table_np != new_table->np) {
                 lazy = true;
                 continue;
             }
 
             required_opp_tables[i] = new_table;
             _get_opp_table_kref(new_table);
 
             /* Link OPPs now */
             ret = lazy_link_required_opps(opp_table, new_table, i);
             if (ret) {
                 /* The OPPs will be marked unusable */
                 lazy = false;
                 break;
             }
         }
 
         of_node_put(opp_np);
 
         /* All required opp-tables found, remove from lazy list */
         if (!lazy) {
             list_del_init(&opp_table->lazy);
 
             list_for_each_entry(opp, &opp_table->opp_list, node)
                 _required_opps_available(opp, opp_table->required_opp_count);
         }
     }
 
     mutex_unlock(&opp_table_lock);
 }
 
 static int _bandwidth_supported(struct device *dev, struct opp_table *opp_table)
 {
     struct device_node *np, *opp_np;
     struct property *prop;
 
     if (!opp_table) {
         np = of_node_get(dev->of_node);
         if (!np)
             return -ENODEV;
 
         opp_np = _opp_of_get_opp_desc_node(np, 0);
         of_node_put(np);
     } else {
         opp_np = of_node_get(opp_table->np);
     }
 
     /* Lets not fail in case we are parsing opp-v1 bindings */
     if (!opp_np)
         return 0;
 
     /* Checking only first OPP is sufficient */
     np = of_get_next_available_child(opp_np, NULL);
     of_node_put(opp_np);
     if (!np) {
         dev_err(dev, "OPP table empty\n");
         return -EINVAL;
     }
 
     prop = of_find_property(np, "opp-peak-kBps", NULL);
     of_node_put(np);
 
     if (!prop || !prop->length)
         return 0;
 
     return 1;
 }
 
 int dev_pm_opp_of_find_icc_paths(struct device *dev,
                  struct opp_table *opp_table)
 {
     struct device_node *np;
     int ret, i, count, num_paths;
     struct icc_path **paths;
 
     ret = _bandwidth_supported(dev, opp_table);
     if (ret == -EINVAL)
         return 0; /* Empty OPP table is a valid corner-case, let's not fail */
     else if (ret <= 0)
         return ret;
 
     ret = 0;
 
     np = of_node_get(dev->of_node);
     if (!np)
         return 0;
 
     count = of_count_phandle_with_args(np, "interconnects",
                        "#interconnect-cells");
     of_node_put(np);
     if (count < 0)
         return 0;
 
     /* two phandles when #interconnect-cells = <1> */
     if (count % 2) {
         dev_err(dev, "%s: Invalid interconnects values\n", __func__);
         return -EINVAL;
     }
 
     num_paths = count / 2;
     paths = kcalloc(num_paths, sizeof(*paths), GFP_KERNEL);
     if (!paths)
         return -ENOMEM;
 
     for (i = 0; i < num_paths; i++) {
         paths[i] = of_icc_get_by_index(dev, i);
         if (IS_ERR(paths[i])) {
             ret = PTR_ERR(paths[i]);
             if (ret != -EPROBE_DEFER) {
                 dev_err(dev, "%s: Unable to get path%d: %d\n",
                     __func__, i, ret);
             }
             goto err;
         }
     }
 
     if (opp_table) {
         opp_table->paths = paths;
         opp_table->path_count = num_paths;
         return 0;
     }
 
 err:
     while (i--)
         icc_put(paths[i]);
 
     kfree(paths);
 
     return ret;
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_of_find_icc_paths);
 
 static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table,
                   struct device_node *np)
 {
     unsigned int levels = opp_table->supported_hw_count;
     int count, versions, ret, i, j;
     u32 val;
 
     if (!opp_table->supported_hw) {
         /*
          * In the case that no supported_hw has been set by the
          * platform but there is an opp-supported-hw value set for
          * an OPP then the OPP should not be enabled as there is
          * no way to see if the hardware supports it.
          */
         if (of_find_property(np, "opp-supported-hw", NULL))
             return false;
         else
             return true;
     }
 
     count = of_property_count_u32_elems(np, "opp-supported-hw");
     if (count <= 0 || count % levels) {
         dev_err(dev, "%s: Invalid opp-supported-hw property (%d)\n",
             __func__, count);
         return false;
     }
 
     versions = count / levels;
 
     /* All levels in at least one of the versions should match */
     for (i = 0; i < versions; i++) {
         bool supported = true;
 
         for (j = 0; j < levels; j++) {
             ret = of_property_read_u32_index(np, "opp-supported-hw",
                              i * levels + j, &val);
             if (ret) {
                 dev_warn(dev, "%s: failed to read opp-supported-hw property at index %d: %d\n",
                      __func__, i * levels + j, ret);
                 return false;
             }
 
             /* Check if the level is supported */
             if (!(val & opp_table->supported_hw[j])) {
                 supported = false;
                 break;
             }
         }
 
         if (supported)
             return true;
     }
 
     return false;
 }
 
 static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev,
                   struct opp_table *opp_table)
 {
     u32 *microvolt, *microamp = NULL, *microwatt = NULL;
     int supplies = opp_table->regulator_count;
     int vcount, icount, pcount, ret, i, j;
     struct property *prop = NULL;
     char name[NAME_MAX];
 
     /* Search for "opp-microvolt-<name>" */
     if (opp_table->prop_name) {
         snprintf(name, sizeof(name), "opp-microvolt-%s",
              opp_table->prop_name);
         prop = of_find_property(opp->np, name, NULL);
     }
 
     if (!prop) {
         /* Search for "opp-microvolt" */
         sprintf(name, "opp-microvolt");
         prop = of_find_property(opp->np, name, NULL);
 
         /* Missing property isn't a problem, but an invalid entry is */
         if (!prop) {
             if (unlikely(supplies == -1)) {
                 /* Initialize regulator_count */
                 opp_table->regulator_count = 0;
                 return 0;
             }
 
             if (!supplies)
                 return 0;
 
             dev_err(dev, "%s: opp-microvolt missing although OPP managing regulators\n",
                 __func__);
             return -EINVAL;
         }
     }
 
     if (unlikely(supplies == -1)) {
         /* Initialize regulator_count */
         supplies = opp_table->regulator_count = 1;
     } else if (unlikely(!supplies)) {
         dev_err(dev, "%s: opp-microvolt wasn't expected\n", __func__);
         return -EINVAL;
     }
 
     vcount = of_property_count_u32_elems(opp->np, name);
     if (vcount < 0) {
         dev_err(dev, "%s: Invalid %s property (%d)\n",
             __func__, name, vcount);
         return vcount;
     }
 
     /* There can be one or three elements per supply */
     if (vcount != supplies && vcount != supplies * 3) {
         dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n",
             __func__, name, vcount, supplies);
         return -EINVAL;
     }
 
     microvolt = kmalloc_array(vcount, sizeof(*microvolt), GFP_KERNEL);
     if (!microvolt)
         return -ENOMEM;
 
     ret = of_property_read_u32_array(opp->np, name, microvolt, vcount);
     if (ret) {
         dev_err(dev, "%s: error parsing %s: %d\n", __func__, name, ret);
         ret = -EINVAL;
         goto free_microvolt;
     }
 
     /* Search for "opp-microamp-<name>" */
     prop = NULL;
     if (opp_table->prop_name) {
         snprintf(name, sizeof(name), "opp-microamp-%s",
              opp_table->prop_name);
         prop = of_find_property(opp->np, name, NULL);
     }
 
     if (!prop) {
         /* Search for "opp-microamp" */
         sprintf(name, "opp-microamp");
         prop = of_find_property(opp->np, name, NULL);
     }
 
     if (prop) {
         icount = of_property_count_u32_elems(opp->np, name);
         if (icount < 0) {
             dev_err(dev, "%s: Invalid %s property (%d)\n", __func__,
                 name, icount);
             ret = icount;
             goto free_microvolt;
         }
 
         if (icount != supplies) {
             dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n",
                 __func__, name, icount, supplies);
             ret = -EINVAL;
             goto free_microvolt;
         }
 
         microamp = kmalloc_array(icount, sizeof(*microamp), GFP_KERNEL);
         if (!microamp) {
             ret = -EINVAL;
             goto free_microvolt;
         }
 
         ret = of_property_read_u32_array(opp->np, name, microamp,
                          icount);
         if (ret) {
             dev_err(dev, "%s: error parsing %s: %d\n", __func__,
                 name, ret);
             ret = -EINVAL;
             goto free_microamp;
         }
     }
 
     /* Search for "opp-microwatt" */
     sprintf(name, "opp-microwatt");
     prop = of_find_property(opp->np, name, NULL);
 
     if (prop) {
         pcount = of_property_count_u32_elems(opp->np, name);
         if (pcount < 0) {
             dev_err(dev, "%s: Invalid %s property (%d)\n", __func__,
                 name, pcount);
             ret = pcount;
             goto free_microamp;
         }
 
         if (pcount != supplies) {
             dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n",
                 __func__, name, pcount, supplies);
             ret = -EINVAL;
             goto free_microamp;
         }
 
         microwatt = kmalloc_array(pcount, sizeof(*microwatt),
                       GFP_KERNEL);
         if (!microwatt) {
             ret = -EINVAL;
             goto free_microamp;
         }
 
         ret = of_property_read_u32_array(opp->np, name, microwatt,
                          pcount);
         if (ret) {
             dev_err(dev, "%s: error parsing %s: %d\n", __func__,
                 name, ret);
             ret = -EINVAL;
             goto free_microwatt;
         }
     }
 
     for (i = 0, j = 0; i < supplies; i++) {
         opp->supplies[i].u_volt = microvolt[j++];
 
         if (vcount == supplies) {
             opp->supplies[i].u_volt_min = opp->supplies[i].u_volt;
             opp->supplies[i].u_volt_max = opp->supplies[i].u_volt;
         } else {
             opp->supplies[i].u_volt_min = microvolt[j++];
             opp->supplies[i].u_volt_max = microvolt[j++];
         }
 
         if (microamp)
             opp->supplies[i].u_amp = microamp[i];
 
         if (microwatt)
             opp->supplies[i].u_watt = microwatt[i];
     }
 
 free_microwatt:
     kfree(microwatt);
 free_microamp:
     kfree(microamp);
 free_microvolt:
     kfree(microvolt);
 
     return ret;
 }
 
 /**
  * dev_pm_opp_of_remove_table() - Free OPP table entries created from static DT
  *                entries
  * @dev:    device pointer used to lookup OPP table.
  *
  * Free OPPs created using static entries present in DT.
  */
 void dev_pm_opp_of_remove_table(struct device *dev)
 {
     dev_pm_opp_remove_table(dev);
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table);
 
 static int _read_rate(struct dev_pm_opp *new_opp, struct opp_table *opp_table,
               struct device_node *np)
 {
     struct property *prop;
     int i, count, ret;
     u64 *rates;
 
     prop = of_find_property(np, "opp-hz", NULL);
     if (!prop)
         return -ENODEV;
 
     count = prop->length / sizeof(u64);
     if (opp_table->clk_count != count) {
         pr_err("%s: Count mismatch between opp-hz and clk_count (%d %d)\n",
                __func__, count, opp_table->clk_count);
         return -EINVAL;
     }
 
     rates = kmalloc_array(count, sizeof(*rates), GFP_KERNEL);
     if (!rates)
         return -ENOMEM;
 
     ret = of_property_read_u64_array(np, "opp-hz", rates, count);
     if (ret) {
         pr_err("%s: Error parsing opp-hz: %d\n", __func__, ret);
     } else {
         /*
          * Rate is defined as an unsigned long in clk API, and so
          * casting explicitly to its type. Must be fixed once rate is 64
          * bit guaranteed in clk API.
          */
         for (i = 0; i < count; i++) {
             new_opp->rates[i] = (unsigned long)rates[i];
 
             /* This will happen for frequencies > 4.29 GHz */
             WARN_ON(new_opp->rates[i] != rates[i]);
         }
     }
 
     kfree(rates);
 
     return ret;
 }
 
 static int _read_bw(struct dev_pm_opp *new_opp, struct opp_table *opp_table,
             struct device_node *np, bool peak)
 {
     const char *name = peak ? "opp-peak-kBps" : "opp-avg-kBps";
     struct property *prop;
     int i, count, ret;
     u32 *bw;
 
     prop = of_find_property(np, name, NULL);
     if (!prop)
         return -ENODEV;
 
     count = prop->length / sizeof(u32);
     if (opp_table->path_count != count) {
         pr_err("%s: Mismatch between %s and paths (%d %d)\n",
                 __func__, name, count, opp_table->path_count);
         return -EINVAL;
     }
 
     bw = kmalloc_array(count, sizeof(*bw), GFP_KERNEL);
     if (!bw)
         return -ENOMEM;
 
     ret = of_property_read_u32_array(np, name, bw, count);
     if (ret) {
         pr_err("%s: Error parsing %s: %d\n", __func__, name, ret);
         goto out;
     }
 
     for (i = 0; i < count; i++) {
         if (peak)
             new_opp->bandwidth[i].peak = kBps_to_icc(bw[i]);
         else
             new_opp->bandwidth[i].avg = kBps_to_icc(bw[i]);
     }
 
 out:
     kfree(bw);
     return ret;
 }
 
 static int _read_opp_key(struct dev_pm_opp *new_opp,
              struct opp_table *opp_table, struct device_node *np)
 {
     bool found = false;
     int ret;
 
     ret = _read_rate(new_opp, opp_table, np);
     if (!ret)
         found = true;
     else if (ret != -ENODEV)
         return ret;
 
     /*
      * Bandwidth consists of peak and average (optional) values:
      * opp-peak-kBps = <path1_value path2_value>;
      * opp-avg-kBps = <path1_value path2_value>;
      */
     ret = _read_bw(new_opp, opp_table, np, true);
     if (!ret) {
         found = true;
         ret = _read_bw(new_opp, opp_table, np, false);
     }
 
     /* The properties were found but we failed to parse them */
     if (ret && ret != -ENODEV)
         return ret;
 
     if (!of_property_read_u32(np, "opp-level", &new_opp->level))
         found = true;
 
     if (found)
         return 0;
 
     return ret;
 }
 
 /**
  * _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings)
  * @opp_table:  OPP table
  * @dev:    device for which we do this operation
  * @np:     device node
  *
  * This function adds an opp definition to the opp table and returns status. The
  * opp can be controlled using dev_pm_opp_enable/disable functions and may be
  * removed by dev_pm_opp_remove.
  *
  * Return:
  * Valid OPP pointer:
  *      On success
  * NULL:
  *      Duplicate OPPs (both freq and volt are same) and opp->available
  *      OR if the OPP is not supported by hardware.
  * ERR_PTR(-EEXIST):
  *      Freq are same and volt are different OR
  *      Duplicate OPPs (both freq and volt are same) and !opp->available
  * ERR_PTR(-ENOMEM):
  *      Memory allocation failure
  * ERR_PTR(-EINVAL):
  *      Failed parsing the OPP node
  */
 static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table,
         struct device *dev, struct device_node *np)
 {
     struct dev_pm_opp *new_opp;
     u32 val;
     int ret;
 
     new_opp = _opp_allocate(opp_table);
     if (!new_opp)
         return ERR_PTR(-ENOMEM);
 
     ret = _read_opp_key(new_opp, opp_table, np);
     if (ret < 0) {
         dev_err(dev, "%s: opp key field not found\n", __func__);
         goto free_opp;
     }
 
     /* Check if the OPP supports hardware's hierarchy of versions or not */
     if (!_opp_is_supported(dev, opp_table, np)) {
         dev_dbg(dev, "OPP not supported by hardware: %s\n",
             of_node_full_name(np));
         goto free_opp;
     }
 
     new_opp->turbo = of_property_read_bool(np, "turbo-mode");
 
     new_opp->np = of_node_get(np);
     new_opp->dynamic = false;
     new_opp->available = true;
 
     ret = _of_opp_alloc_required_opps(opp_table, new_opp);
     if (ret)
         goto free_opp;
 
     if (!of_property_read_u32(np, "clock-latency-ns", &val))
         new_opp->clock_latency_ns = val;
 
     ret = opp_parse_supplies(new_opp, dev, opp_table);
     if (ret)
         goto free_required_opps;
 
     if (opp_table->is_genpd)
         new_opp->pstate = pm_genpd_opp_to_performance_state(dev, new_opp);
 
     ret = _opp_add(dev, new_opp, opp_table);
     if (ret) {
         /* Don't return error for duplicate OPPs */
         if (ret == -EBUSY)
             ret = 0;
         goto free_required_opps;
     }
 
     /* OPP to select on device suspend */
     if (of_property_read_bool(np, "opp-suspend")) {
         if (opp_table->suspend_opp) {
             /* Pick the OPP with higher rate/bw/level as suspend OPP */
             if (_opp_compare_key(opp_table, new_opp, opp_table->suspend_opp) == 1) {
                 opp_table->suspend_opp->suspend = false;
                 new_opp->suspend = true;
                 opp_table->suspend_opp = new_opp;
             }
         } else {
             new_opp->suspend = true;
             opp_table->suspend_opp = new_opp;
         }
     }
 
     if (new_opp->clock_latency_ns > opp_table->clock_latency_ns_max)
         opp_table->clock_latency_ns_max = new_opp->clock_latency_ns;
 
     pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu level:%u\n",
          __func__, new_opp->turbo, new_opp->rates[0],
          new_opp->supplies[0].u_volt, new_opp->supplies[0].u_volt_min,
          new_opp->supplies[0].u_volt_max, new_opp->clock_latency_ns,
          new_opp->level);
 
     /*
      * Notify the changes in the availability of the operable
      * frequency/voltage list.
      */
     blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp);
     return new_opp;
 
 free_required_opps:
     _of_opp_free_required_opps(opp_table, new_opp);
 free_opp:
     _opp_free(new_opp);
 
     return ret ? ERR_PTR(ret) : NULL;
 }
 
 /* Initializes OPP tables based on new bindings */
 static int _of_add_opp_table_v2(struct device *dev, struct opp_table *opp_table)
 {
     struct device_node *np;
     int ret, count = 0;
     struct dev_pm_opp *opp;
 
     /* OPP table is already initialized for the device */
     mutex_lock(&opp_table->lock);
     if (opp_table->parsed_static_opps) {
         opp_table->parsed_static_opps++;
         mutex_unlock(&opp_table->lock);
         return 0;
     }
 
     opp_table->parsed_static_opps = 1;
     mutex_unlock(&opp_table->lock);
 
     /* We have opp-table node now, iterate over it and add OPPs */
     for_each_available_child_of_node(opp_table->np, np) {
         opp = _opp_add_static_v2(opp_table, dev, np);
         if (IS_ERR(opp)) {
             ret = PTR_ERR(opp);
             dev_err(dev, "%s: Failed to add OPP, %d\n", __func__,
                 ret);
             of_node_put(np);
             goto remove_static_opp;
         } else if (opp) {
             count++;
         }
     }
 
     /* There should be one or more OPPs defined */
     if (!count) {
         dev_err(dev, "%s: no supported OPPs", __func__);
         ret = -ENOENT;
         goto remove_static_opp;
     }
 
     list_for_each_entry(opp, &opp_table->opp_list, node) {
         /* Any non-zero performance state would enable the feature */
         if (opp->pstate) {
             opp_table->genpd_performance_state = true;
             break;
         }
     }
 
     lazy_link_required_opp_table(opp_table);
 
     return 0;
 
 remove_static_opp:
     _opp_remove_all_static(opp_table);
 
     return ret;
 }
 
 /* Initializes OPP tables based on old-deprecated bindings */
 static int _of_add_opp_table_v1(struct device *dev, struct opp_table *opp_table)
 {
     const struct property *prop;
     const __be32 *val;
     int nr, ret = 0;
 
     mutex_lock(&opp_table->lock);
     if (opp_table->parsed_static_opps) {
         opp_table->parsed_static_opps++;
         mutex_unlock(&opp_table->lock);
         return 0;
     }
 
     opp_table->parsed_static_opps = 1;
     mutex_unlock(&opp_table->lock);
 
     prop = of_find_property(dev->of_node, "operating-points", NULL);
     if (!prop) {
         ret = -ENODEV;
         goto remove_static_opp;
     }
     if (!prop->value) {
         ret = -ENODATA;
         goto remove_static_opp;
     }
 
     /*
      * Each OPP is a set of tuples consisting of frequency and
      * voltage like <freq-kHz vol-uV>.
      */
     nr = prop->length / sizeof(u32);
     if (nr % 2) {
         dev_err(dev, "%s: Invalid OPP table\n", __func__);
         ret = -EINVAL;
         goto remove_static_opp;
     }
 
     val = prop->value;
     while (nr) {
         unsigned long freq = be32_to_cpup(val++) * 1000;
         unsigned long volt = be32_to_cpup(val++);
 
         ret = _opp_add_v1(opp_table, dev, freq, volt, false);
         if (ret) {
             dev_err(dev, "%s: Failed to add OPP %ld (%d)\n",
                 __func__, freq, ret);
             goto remove_static_opp;
         }
         nr -= 2;
     }
 
     return 0;
 
 remove_static_opp:
     _opp_remove_all_static(opp_table);
 
     return ret;
 }
 
 static int _of_add_table_indexed(struct device *dev, int index)
 {
     struct opp_table *opp_table;
     int ret, count;
 
     if (index) {
         /*
          * If only one phandle is present, then the same OPP table
          * applies for all index requests.
          */
         count = of_count_phandle_with_args(dev->of_node,
                            "operating-points-v2", NULL);
         if (count == 1)
             index = 0;
     }
 
     opp_table = _add_opp_table_indexed(dev, index, true);
     if (IS_ERR(opp_table))
         return PTR_ERR(opp_table);
 
     /*
      * OPPs have two version of bindings now. Also try the old (v1)
      * bindings for backward compatibility with older dtbs.
      */
     if (opp_table->np)
         ret = _of_add_opp_table_v2(dev, opp_table);
     else
         ret = _of_add_opp_table_v1(dev, opp_table);
 
     if (ret)
         dev_pm_opp_put_opp_table(opp_table);
 
     return ret;
 }
 
 static void devm_pm_opp_of_table_release(void *data)
 {
     dev_pm_opp_of_remove_table(data);
 }
 
 static int _devm_of_add_table_indexed(struct device *dev, int index)
 {
     int ret;
 
     ret = _of_add_table_indexed(dev, index);
     if (ret)
         return ret;
 
     return devm_add_action_or_reset(dev, devm_pm_opp_of_table_release, dev);
 }
 
 /**
  * devm_pm_opp_of_add_table() - Initialize opp table from device tree
  * @dev:    device pointer used to lookup OPP table.
  *
  * Register the initial OPP table with the OPP library for given device.
  *
  * The opp_table structure will be freed after the device is destroyed.
  *
  * Return:
  * 0        On success OR
  *      Duplicate OPPs (both freq and volt are same) and opp->available
  * -EEXIST  Freq are same and volt are different OR
  *      Duplicate OPPs (both freq and volt are same) and !opp->available
  * -ENOMEM  Memory allocation failure
  * -ENODEV  when 'operating-points' property is not found or is invalid data
  *      in device node.
  * -ENODATA when empty 'operating-points' property is found
  * -EINVAL  when invalid entries are found in opp-v2 table
  */
 int devm_pm_opp_of_add_table(struct device *dev)
 {
     return _devm_of_add_table_indexed(dev, 0);
 }
 EXPORT_SYMBOL_GPL(devm_pm_opp_of_add_table);
 
 /**
  * dev_pm_opp_of_add_table() - Initialize opp table from device tree
  * @dev:    device pointer used to lookup OPP table.
  *
  * Register the initial OPP table with the OPP library for given device.
  *
  * Return:
  * 0        On success OR
  *      Duplicate OPPs (both freq and volt are same) and opp->available
  * -EEXIST  Freq are same and volt are different OR
  *      Duplicate OPPs (both freq and volt are same) and !opp->available
  * -ENOMEM  Memory allocation failure
  * -ENODEV  when 'operating-points' property is not found or is invalid data
  *      in device node.
  * -ENODATA when empty 'operating-points' property is found
  * -EINVAL  when invalid entries are found in opp-v2 table
  */
 int dev_pm_opp_of_add_table(struct device *dev)
 {
     return _of_add_table_indexed(dev, 0);
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table);
 
 /**
  * dev_pm_opp_of_add_table_indexed() - Initialize indexed opp table from device tree
  * @dev:    device pointer used to lookup OPP table.
  * @index:  Index number.
  *
  * Register the initial OPP table with the OPP library for given device only
  * using the "operating-points-v2" property.
  *
  * Return: Refer to dev_pm_opp_of_add_table() for return values.
  */
 int dev_pm_opp_of_add_table_indexed(struct device *dev, int index)
 {
     return _of_add_table_indexed(dev, index);
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table_indexed);
 
 /**
  * devm_pm_opp_of_add_table_indexed() - Initialize indexed opp table from device tree
  * @dev:    device pointer used to lookup OPP table.
  * @index:  Index number.
  *
  * This is a resource-managed variant of dev_pm_opp_of_add_table_indexed().
  */
 int devm_pm_opp_of_add_table_indexed(struct device *dev, int index)
 {
     return _devm_of_add_table_indexed(dev, index);
 }
 EXPORT_SYMBOL_GPL(devm_pm_opp_of_add_table_indexed);
 
 /* CPU device specific helpers */
 
 /**
  * dev_pm_opp_of_cpumask_remove_table() - Removes OPP table for @cpumask
  * @cpumask:    cpumask for which OPP table needs to be removed
  *
  * This removes the OPP tables for CPUs present in the @cpumask.
  * This should be used only to remove static entries created from DT.
  */
 void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask)
 {
     _dev_pm_opp_cpumask_remove_table(cpumask, -1);
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table);
 
 /**
  * dev_pm_opp_of_cpumask_add_table() - Adds OPP table for @cpumask
  * @cpumask:    cpumask for which OPP table needs to be added.
  *
  * This adds the OPP tables for CPUs present in the @cpumask.
  */
 int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask)
 {
     struct device *cpu_dev;
     int cpu, ret;
 
     if (WARN_ON(cpumask_empty(cpumask)))
         return -ENODEV;
 
     for_each_cpu(cpu, cpumask) {
         cpu_dev = get_cpu_device(cpu);
         if (!cpu_dev) {
             pr_err("%s: failed to get cpu%d device\n", __func__,
                    cpu);
             ret = -ENODEV;
             goto remove_table;
         }
 
         ret = dev_pm_opp_of_add_table(cpu_dev);
         if (ret) {
             /*
              * OPP may get registered dynamically, don't print error
              * message here.
              */
             pr_debug("%s: couldn't find opp table for cpu:%d, %d\n",
                  __func__, cpu, ret);
 
             goto remove_table;
         }
     }
 
     return 0;
 
 remove_table:
     /* Free all other OPPs */
     _dev_pm_opp_cpumask_remove_table(cpumask, cpu);
 
     return ret;
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table);
 
 /*
  * Works only for OPP v2 bindings.
  *
  * Returns -ENOENT if operating-points-v2 bindings aren't supported.
  */
 /**
  * dev_pm_opp_of_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with
  *                    @cpu_dev using operating-points-v2
  *                    bindings.
  *
  * @cpu_dev:    CPU device for which we do this operation
  * @cpumask:    cpumask to update with information of sharing CPUs
  *
  * This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev.
  *
  * Returns -ENOENT if operating-points-v2 isn't present for @cpu_dev.
  */
 int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev,
                    struct cpumask *cpumask)
 {
     struct device_node *np, *tmp_np, *cpu_np;
     int cpu, ret = 0;
 
     /* Get OPP descriptor node */
     np = dev_pm_opp_of_get_opp_desc_node(cpu_dev);
     if (!np) {
         dev_dbg(cpu_dev, "%s: Couldn't find opp node.\n", __func__);
         return -ENOENT;
     }
 
     cpumask_set_cpu(cpu_dev->id, cpumask);
 
     /* OPPs are shared ? */
     if (!of_property_read_bool(np, "opp-shared"))
         goto put_cpu_node;
 
     for_each_possible_cpu(cpu) {
         if (cpu == cpu_dev->id)
             continue;
 
         cpu_np = of_cpu_device_node_get(cpu);
         if (!cpu_np) {
             dev_err(cpu_dev, "%s: failed to get cpu%d node\n",
                 __func__, cpu);
             ret = -ENOENT;
             goto put_cpu_node;
         }
 
         /* Get OPP descriptor node */
         tmp_np = _opp_of_get_opp_desc_node(cpu_np, 0);
         of_node_put(cpu_np);
         if (!tmp_np) {
             pr_err("%pOF: Couldn't find opp node\n", cpu_np);
             ret = -ENOENT;
             goto put_cpu_node;
         }
 
         /* CPUs are sharing opp node */
         if (np == tmp_np)
             cpumask_set_cpu(cpu, cpumask);
 
         of_node_put(tmp_np);
     }
 
 put_cpu_node:
     of_node_put(np);
     return ret;
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_sharing_cpus);
 
 /**
  * of_get_required_opp_performance_state() - Search for required OPP and return its performance state.
  * @np: Node that contains the "required-opps" property.
  * @index: Index of the phandle to parse.
  *
  * Returns the performance state of the OPP pointed out by the "required-opps"
  * property at @index in @np.
  *
  * Return: Zero or positive performance state on success, otherwise negative
  * value on errors.
  */
 int of_get_required_opp_performance_state(struct device_node *np, int index)
 {
     struct dev_pm_opp *opp;
     struct device_node *required_np;
     struct opp_table *opp_table;
     int pstate = -EINVAL;
 
     required_np = of_parse_required_opp(np, index);
     if (!required_np)
         return -ENODEV;
 
     opp_table = _find_table_of_opp_np(required_np);
     if (IS_ERR(opp_table)) {
         pr_err("%s: Failed to find required OPP table %pOF: %ld\n",
                __func__, np, PTR_ERR(opp_table));
         goto put_required_np;
     }
 
     opp = _find_opp_of_np(opp_table, required_np);
     if (opp) {
         pstate = opp->pstate;
         dev_pm_opp_put(opp);
     }
 
     dev_pm_opp_put_opp_table(opp_table);
 
 put_required_np:
     of_node_put(required_np);
 
     return pstate;
 }
 EXPORT_SYMBOL_GPL(of_get_required_opp_performance_state);
 
 /**
  * dev_pm_opp_get_of_node() - Gets the DT node corresponding to an opp
  * @opp:    opp for which DT node has to be returned for
  *
  * Return: DT node corresponding to the opp, else 0 on success.
  *
  * The caller needs to put the node with of_node_put() after using it.
  */
 struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp)
 {
     if (IS_ERR_OR_NULL(opp)) {
         pr_err("%s: Invalid parameters\n", __func__);
         return NULL;
     }
 
     return of_node_get(opp->np);
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_get_of_node);
 
 /*
  * Callback function provided to the Energy Model framework upon registration.
  * It provides the power used by @dev at @kHz if it is the frequency of an
  * existing OPP, or at the frequency of the first OPP above @kHz otherwise
  * (see dev_pm_opp_find_freq_ceil()). This function updates @kHz to the ceiled
  * frequency and @uW to the associated power.
  *
  * Returns 0 on success or a proper -EINVAL value in case of error.
  */
 static int __maybe_unused
 _get_dt_power(struct device *dev, unsigned long *uW, unsigned long *kHz)
 {
     struct dev_pm_opp *opp;
     unsigned long opp_freq, opp_power;
 
     /* Find the right frequency and related OPP */
     opp_freq = *kHz * 1000;
     opp = dev_pm_opp_find_freq_ceil(dev, &opp_freq);
     if (IS_ERR(opp))
         return -EINVAL;
 
     opp_power = dev_pm_opp_get_power(opp);
     dev_pm_opp_put(opp);
     if (!opp_power)
         return -EINVAL;
 
     *kHz = opp_freq / 1000;
     *uW = opp_power;
 
     return 0;
 }
 
 /*
  * Callback function provided to the Energy Model framework upon registration.
  * This computes the power estimated by @dev at @kHz if it is the frequency
  * of an existing OPP, or at the frequency of the first OPP above @kHz otherwise
  * (see dev_pm_opp_find_freq_ceil()). This function updates @kHz to the ceiled
  * frequency and @uW to the associated power. The power is estimated as
  * P = C * V^2 * f with C being the device's capacitance and V and f
  * respectively the voltage and frequency of the OPP.
  *
  * Returns -EINVAL if the power calculation failed because of missing
  * parameters, 0 otherwise.
  */
 static int __maybe_unused _get_power(struct device *dev, unsigned long *uW,
                      unsigned long *kHz)
 {
     struct dev_pm_opp *opp;
     struct device_node *np;
     unsigned long mV, Hz;
     u32 cap;
     u64 tmp;
     int ret;
 
     np = of_node_get(dev->of_node);
     if (!np)
         return -EINVAL;
 
     ret = of_property_read_u32(np, "dynamic-power-coefficient", &cap);
     of_node_put(np);
     if (ret)
         return -EINVAL;
 
     Hz = *kHz * 1000;
     opp = dev_pm_opp_find_freq_ceil(dev, &Hz);
     if (IS_ERR(opp))
         return -EINVAL;
 
     mV = dev_pm_opp_get_voltage(opp) / 1000;
     dev_pm_opp_put(opp);
     if (!mV)
         return -EINVAL;
 
     tmp = (u64)cap * mV * mV * (Hz / 1000000);
     /* Provide power in micro-Watts */
     do_div(tmp, 1000000);
 
     *uW = (unsigned long)tmp;
     *kHz = Hz / 1000;
 
     return 0;
 }
 
 static bool _of_has_opp_microwatt_property(struct device *dev)
 {
     unsigned long power, freq = 0;
     struct dev_pm_opp *opp;
 
     /* Check if at least one OPP has needed property */
     opp = dev_pm_opp_find_freq_ceil(dev, &freq);
     if (IS_ERR(opp))
         return false;
 
     power = dev_pm_opp_get_power(opp);
     dev_pm_opp_put(opp);
     if (!power)
         return false;
 
     return true;
 }
 
 /**
  * dev_pm_opp_of_register_em() - Attempt to register an Energy Model
  * @dev     : Device for which an Energy Model has to be registered
  * @cpus    : CPUs for which an Energy Model has to be registered. For
  *      other type of devices it should be set to NULL.
  *
  * This checks whether the "dynamic-power-coefficient" devicetree property has
  * been specified, and tries to register an Energy Model with it if it has.
  * Having this property means the voltages are known for OPPs and the EM
  * might be calculated.
  */
 int dev_pm_opp_of_register_em(struct device *dev, struct cpumask *cpus)
 {
     struct em_data_callback em_cb;
     struct device_node *np;
     int ret, nr_opp;
     u32 cap;
 
     if (IS_ERR_OR_NULL(dev)) {
         ret = -EINVAL;
         goto failed;
     }
 
     nr_opp = dev_pm_opp_get_opp_count(dev);
     if (nr_opp <= 0) {
         ret = -EINVAL;
         goto failed;
     }
 
     /* First, try to find more precised Energy Model in DT */
     if (_of_has_opp_microwatt_property(dev)) {
         EM_SET_ACTIVE_POWER_CB(em_cb, _get_dt_power);
         goto register_em;
     }
 
     np = of_node_get(dev->of_node);
     if (!np) {
         ret = -EINVAL;
         goto failed;
     }
 
     /*
      * Register an EM only if the 'dynamic-power-coefficient' property is
      * set in devicetree. It is assumed the voltage values are known if that
      * property is set since it is useless otherwise. If voltages are not
      * known, just let the EM registration fail with an error to alert the
      * user about the inconsistent configuration.
      */
     ret = of_property_read_u32(np, "dynamic-power-coefficient", &cap);
     of_node_put(np);
     if (ret || !cap) {
         dev_dbg(dev, "Couldn't find proper 'dynamic-power-coefficient' in DT\n");
         ret = -EINVAL;
         goto failed;
     }
 
     EM_SET_ACTIVE_POWER_CB(em_cb, _get_power);
 
 register_em:
     ret = em_dev_register_perf_domain(dev, nr_opp, &em_cb, cpus, true);
     if (ret)
         goto failed;
 
     return 0;
 
 failed:
     dev_dbg(dev, "Couldn't register Energy Model %d\n", ret);
     return ret;
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_of_register_em);

This page was automatically generated by the 2.1.0 LXR engine. The LXR team