// SPDX-License-Identifier: GPL-2.0-only

  /*
   * Generic OPP Interface
   *
   * Copyright (C) 2009-2010 Texas Instruments Incorporated.
   *	Nishanth Menon
   *	Romit Dasgupta
   *	Kevin Hilman

   */

  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

  #include <linux/clk.h>

  #include <linux/errno.h>
  #include <linux/err.h>

  #include <linux/slab.h>

  #include <linux/device.h>

  #include <linux/export.h>

  #include <linux/pm_domain.h>

  #include <linux/regulator/consumer.h>

  #include "opp.h"

  
  /*

   * The root of the list of all opp-tables. All opp_table structures branch off
   * from here, with each opp_table containing the list of opps it supports in

   * various states of availability.
   */

  LIST_HEAD(opp_tables);

  /* Lock to allow exclusive modification to the device and opp lists */

  DEFINE_MUTEX(opp_table_lock);

  static struct opp_device *_find_opp_dev(const struct device *dev,
  					struct opp_table *opp_table)

  {

  	struct opp_device *opp_dev;

  	list_for_each_entry(opp_dev, &opp_table->dev_list, node)
  		if (opp_dev->dev == dev)
  			return opp_dev;

  
  	return NULL;
  }

  static struct opp_table *_find_opp_table_unlocked(struct device *dev)

  {
  	struct opp_table *opp_table;

  	bool found;

  
  	list_for_each_entry(opp_table, &opp_tables, node) {

  		mutex_lock(&opp_table->lock);
  		found = !!_find_opp_dev(dev, opp_table);
  		mutex_unlock(&opp_table->lock);
  
  		if (found) {

  			_get_opp_table_kref(opp_table);
  
  			return opp_table;
  		}
  	}
  
  	return ERR_PTR(-ENODEV);
  }

  /**

   * _find_opp_table() - find opp_table struct using device pointer
   * @dev:	device pointer used to lookup OPP table

   *

   * Search OPP table for one containing matching device.

   *

   * Return: pointer to 'struct opp_table' if found, otherwise -ENODEV or

   * -EINVAL based on type of error.
   *

   * The callers must call dev_pm_opp_put_opp_table() after the table is used.

   */

  struct opp_table *_find_opp_table(struct device *dev)

  {

  	struct opp_table *opp_table;

  	if (IS_ERR_OR_NULL(dev)) {

  		pr_err("%s: Invalid parameters
  ", __func__);
  		return ERR_PTR(-EINVAL);
  	}

  	mutex_lock(&opp_table_lock);
  	opp_table = _find_opp_table_unlocked(dev);
  	mutex_unlock(&opp_table_lock);

  	return opp_table;

  }
  
  /**

   * dev_pm_opp_get_voltage() - Gets the voltage corresponding to an opp

   * @opp:	opp for which voltage has to be returned for
   *

   * Return: voltage in micro volt corresponding to the opp, else

   * return 0
   *

   * This is useful only for devices with single power supply.

   */

  unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)

  {

  	if (IS_ERR_OR_NULL(opp)) {

  		pr_err("%s: Invalid parameters
  ", __func__);

  		return 0;
  	}

  	return opp->supplies[0].u_volt;

  }

  EXPORT_SYMBOL_GPL(dev_pm_opp_get_voltage);

  
  /**

   * dev_pm_opp_get_freq() - Gets the frequency corresponding to an available opp

   * @opp:	opp for which frequency has to be returned for
   *

   * Return: frequency in hertz corresponding to the opp, else

   * return 0

   */

  unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)

  {

  	if (IS_ERR_OR_NULL(opp)) {

  		pr_err("%s: Invalid parameters
  ", __func__);

  		return 0;
  	}

  	return opp->rate;

  }

  EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq);

  
  /**

   * dev_pm_opp_get_level() - Gets the level corresponding to an available opp
   * @opp:	opp for which level value has to be returned for
   *
   * Return: level read from device tree corresponding to the opp, else
   * return 0.
   */
  unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp)
  {
  	if (IS_ERR_OR_NULL(opp) || !opp->available) {
  		pr_err("%s: Invalid parameters
  ", __func__);
  		return 0;
  	}
  
  	return opp->level;
  }
  EXPORT_SYMBOL_GPL(dev_pm_opp_get_level);
  
  /**

   * dev_pm_opp_is_turbo() - Returns if opp is turbo OPP or not
   * @opp: opp for which turbo mode is being verified
   *
   * Turbo OPPs are not for normal use, and can be enabled (under certain
   * conditions) for short duration of times to finish high throughput work
   * quickly. Running on them for longer times may overheat the chip.
   *
   * Return: true if opp is turbo opp, else false.

   */
  bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp)
  {

  	if (IS_ERR_OR_NULL(opp) || !opp->available) {

  		pr_err("%s: Invalid parameters
  ", __func__);
  		return false;
  	}

  	return opp->turbo;

  }
  EXPORT_SYMBOL_GPL(dev_pm_opp_is_turbo);
  
  /**

   * dev_pm_opp_get_max_clock_latency() - Get max clock latency in nanoseconds
   * @dev:	device for which we do this operation
   *
   * Return: This function returns the max clock latency in nanoseconds.

   */
  unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
  {

  	struct opp_table *opp_table;

  	unsigned long clock_latency_ns;

  	opp_table = _find_opp_table(dev);
  	if (IS_ERR(opp_table))

  		return 0;
  
  	clock_latency_ns = opp_table->clock_latency_ns_max;
  
  	dev_pm_opp_put_opp_table(opp_table);

  	return clock_latency_ns;
  }
  EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency);
  
  /**

   * dev_pm_opp_get_max_volt_latency() - Get max voltage latency in nanoseconds
   * @dev: device for which we do this operation
   *
   * Return: This function returns the max voltage latency in nanoseconds.

   */
  unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)
  {

  	struct opp_table *opp_table;

  	struct dev_pm_opp *opp;

  	struct regulator *reg;

  	unsigned long latency_ns = 0;

  	int ret, i, count;
  	struct {
  		unsigned long min;
  		unsigned long max;
  	} *uV;

  	opp_table = _find_opp_table(dev);
  	if (IS_ERR(opp_table))
  		return 0;

  	/* Regulator may not be required for the device */

  	if (!opp_table->regulators)

  		goto put_opp_table;

  	count = opp_table->regulator_count;

  	uV = kmalloc_array(count, sizeof(*uV), GFP_KERNEL);
  	if (!uV)

  		goto put_opp_table;

  	mutex_lock(&opp_table->lock);

  	for (i = 0; i < count; i++) {
  		uV[i].min = ~0;
  		uV[i].max = 0;

  		list_for_each_entry(opp, &opp_table->opp_list, node) {

  			if (!opp->available)
  				continue;
  
  			if (opp->supplies[i].u_volt_min < uV[i].min)
  				uV[i].min = opp->supplies[i].u_volt_min;
  			if (opp->supplies[i].u_volt_max > uV[i].max)
  				uV[i].max = opp->supplies[i].u_volt_max;
  		}

  	}

  	mutex_unlock(&opp_table->lock);

  
  	/*

  	 * The caller needs to ensure that opp_table (and hence the regulator)

  	 * isn't freed, while we are executing this routine.
  	 */

  	for (i = 0; i < count; i++) {

  		reg = opp_table->regulators[i];

  		ret = regulator_set_voltage_time(reg, uV[i].min, uV[i].max);
  		if (ret > 0)
  			latency_ns += ret * 1000;
  	}

  	kfree(uV);

  put_opp_table:
  	dev_pm_opp_put_opp_table(opp_table);

  
  	return latency_ns;
  }
  EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_volt_latency);
  
  /**

   * dev_pm_opp_get_max_transition_latency() - Get max transition latency in
   *					     nanoseconds
   * @dev: device for which we do this operation
   *
   * Return: This function returns the max transition latency, in nanoseconds, to
   * switch from one OPP to other.

   */
  unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev)
  {
  	return dev_pm_opp_get_max_volt_latency(dev) +
  		dev_pm_opp_get_max_clock_latency(dev);
  }
  EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_transition_latency);
  
  /**

   * dev_pm_opp_get_suspend_opp_freq() - Get frequency of suspend opp in Hz

   * @dev:	device for which we do this operation
   *

   * Return: This function returns the frequency of the OPP marked as suspend_opp
   * if one is available, else returns 0;

   */

  unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev)

  {

  	struct opp_table *opp_table;

  	unsigned long freq = 0;

  	opp_table = _find_opp_table(dev);

  	if (IS_ERR(opp_table))
  		return 0;

  	if (opp_table->suspend_opp && opp_table->suspend_opp->available)
  		freq = dev_pm_opp_get_freq(opp_table->suspend_opp);
  
  	dev_pm_opp_put_opp_table(opp_table);

  	return freq;

  }

  EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp_freq);

  int _get_opp_count(struct opp_table *opp_table)
  {
  	struct dev_pm_opp *opp;
  	int count = 0;
  
  	mutex_lock(&opp_table->lock);
  
  	list_for_each_entry(opp, &opp_table->opp_list, node) {
  		if (opp->available)
  			count++;
  	}
  
  	mutex_unlock(&opp_table->lock);
  
  	return count;
  }

  /**

   * dev_pm_opp_get_opp_count() - Get number of opps available in the opp table

   * @dev:	device for which we do this operation
   *

   * Return: This function returns the number of available opps if there are any,

   * else returns 0 if none or the corresponding error value.

   */

  int dev_pm_opp_get_opp_count(struct device *dev)

  {

  	struct opp_table *opp_table;

  	int count;

  	opp_table = _find_opp_table(dev);
  	if (IS_ERR(opp_table)) {
  		count = PTR_ERR(opp_table);

  		dev_dbg(dev, "%s: OPP table not found (%d)
  ",

  			__func__, count);

  		return count;

  	}

  	count = _get_opp_count(opp_table);

  	dev_pm_opp_put_opp_table(opp_table);

  	return count;
  }

  EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count);

  
  /**

   * dev_pm_opp_find_freq_exact() - search for an exact frequency

   * @dev:		device for which we do this operation
   * @freq:		frequency to search for

   * @available:		true/false - match for available opp

   *

   * Return: Searches for exact match in the opp table and returns pointer to the

   * matching opp if found, else returns ERR_PTR in case of error and should
   * be handled using IS_ERR. Error return values can be:

   * EINVAL:	for bad pointer
   * ERANGE:	no match found for search
   * ENODEV:	if device not found in list of registered devices

   *
   * Note: available is a modifier for the search. if available=true, then the
   * match is for exact matching frequency and is available in the stored OPP
   * table. if false, the match is for exact frequency which is not available.
   *
   * This provides a mechanism to enable an opp which is not available currently
   * or the opposite as well.
   *

   * The callers are required to call dev_pm_opp_put() for the returned OPP after
   * use.

   */

  struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
  					      unsigned long freq,
  					      bool available)

  {

  	struct opp_table *opp_table;

  	struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);

  	opp_table = _find_opp_table(dev);
  	if (IS_ERR(opp_table)) {
  		int r = PTR_ERR(opp_table);
  
  		dev_err(dev, "%s: OPP table not found (%d)
  ", __func__, r);

  		return ERR_PTR(r);
  	}

  	mutex_lock(&opp_table->lock);

  	list_for_each_entry(temp_opp, &opp_table->opp_list, node) {

  		if (temp_opp->available == available &&
  				temp_opp->rate == freq) {
  			opp = temp_opp;

  
  			/* Increment the reference count of OPP */
  			dev_pm_opp_get(opp);

  			break;
  		}
  	}

  	mutex_unlock(&opp_table->lock);

  	dev_pm_opp_put_opp_table(opp_table);

  	return opp;
  }

  EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact);

  /**
   * dev_pm_opp_find_level_exact() - search for an exact level
   * @dev:		device for which we do this operation
   * @level:		level to search for
   *
   * Return: Searches for exact match in the opp table and returns pointer to the
   * matching opp if found, else returns ERR_PTR in case of error and should
   * be handled using IS_ERR. Error return values can be:
   * EINVAL:	for bad pointer
   * ERANGE:	no match found for search
   * ENODEV:	if device not found in list of registered devices
   *
   * The callers are required to call dev_pm_opp_put() for the returned OPP after
   * use.
   */
  struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev,
  					       unsigned int level)
  {
  	struct opp_table *opp_table;
  	struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
  
  	opp_table = _find_opp_table(dev);
  	if (IS_ERR(opp_table)) {
  		int r = PTR_ERR(opp_table);
  
  		dev_err(dev, "%s: OPP table not found (%d)
  ", __func__, r);
  		return ERR_PTR(r);
  	}
  
  	mutex_lock(&opp_table->lock);
  
  	list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
  		if (temp_opp->level == level) {
  			opp = temp_opp;
  
  			/* Increment the reference count of OPP */
  			dev_pm_opp_get(opp);
  			break;
  		}
  	}
  
  	mutex_unlock(&opp_table->lock);
  	dev_pm_opp_put_opp_table(opp_table);
  
  	return opp;
  }
  EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_exact);

  static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table,
  						   unsigned long *freq)
  {
  	struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);

  	mutex_lock(&opp_table->lock);
  
  	list_for_each_entry(temp_opp, &opp_table->opp_list, node) {

  		if (temp_opp->available && temp_opp->rate >= *freq) {
  			opp = temp_opp;
  			*freq = opp->rate;

  
  			/* Increment the reference count of OPP */
  			dev_pm_opp_get(opp);

  			break;
  		}
  	}

  	mutex_unlock(&opp_table->lock);

  	return opp;
  }

  /**

   * dev_pm_opp_find_freq_ceil() - Search for an rounded ceil freq

   * @dev:	device for which we do this operation
   * @freq:	Start frequency
   *
   * Search for the matching ceil *available* OPP from a starting freq
   * for a device.
   *

   * Return: matching *opp and refreshes *freq accordingly, else returns

   * ERR_PTR in case of error and should be handled using IS_ERR. Error return
   * values can be:
   * EINVAL:	for bad pointer
   * ERANGE:	no match found for search
   * ENODEV:	if device not found in list of registered devices

   *

   * The callers are required to call dev_pm_opp_put() for the returned OPP after
   * use.

   */

  struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
  					     unsigned long *freq)

  {

  	struct opp_table *opp_table;

  	struct dev_pm_opp *opp;

  	if (!dev || !freq) {
  		dev_err(dev, "%s: Invalid argument freq=%p
  ", __func__, freq);
  		return ERR_PTR(-EINVAL);
  	}

  	opp_table = _find_opp_table(dev);

  	if (IS_ERR(opp_table))

  		return ERR_CAST(opp_table);

  	opp = _find_freq_ceil(opp_table, freq);

  	dev_pm_opp_put_opp_table(opp_table);

  
  	return opp;

  }

  EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil);

  
  /**

   * dev_pm_opp_find_freq_floor() - Search for a rounded floor freq

   * @dev:	device for which we do this operation
   * @freq:	Start frequency
   *
   * Search for the matching floor *available* OPP from a starting freq
   * for a device.
   *

   * Return: matching *opp and refreshes *freq accordingly, else returns

   * ERR_PTR in case of error and should be handled using IS_ERR. Error return
   * values can be:
   * EINVAL:	for bad pointer
   * ERANGE:	no match found for search
   * ENODEV:	if device not found in list of registered devices

   *

   * The callers are required to call dev_pm_opp_put() for the returned OPP after
   * use.

   */

  struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
  					      unsigned long *freq)

  {

  	struct opp_table *opp_table;

  	struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);

  
  	if (!dev || !freq) {
  		dev_err(dev, "%s: Invalid argument freq=%p
  ", __func__, freq);
  		return ERR_PTR(-EINVAL);
  	}

  	opp_table = _find_opp_table(dev);

  	if (IS_ERR(opp_table))

  		return ERR_CAST(opp_table);

  	mutex_lock(&opp_table->lock);

  	list_for_each_entry(temp_opp, &opp_table->opp_list, node) {

  		if (temp_opp->available) {
  			/* go to the next node, before choosing prev */
  			if (temp_opp->rate > *freq)
  				break;
  			else
  				opp = temp_opp;
  		}
  	}

  
  	/* Increment the reference count of OPP */
  	if (!IS_ERR(opp))
  		dev_pm_opp_get(opp);

  	mutex_unlock(&opp_table->lock);

  	dev_pm_opp_put_opp_table(opp_table);

  	if (!IS_ERR(opp))
  		*freq = opp->rate;
  
  	return opp;
  }

  EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor);

  /**
   * dev_pm_opp_find_freq_ceil_by_volt() - Find OPP with highest frequency for
   *					 target voltage.
   * @dev:	Device for which we do this operation.
   * @u_volt:	Target voltage.
   *
   * Search for OPP with highest (ceil) frequency and has voltage <= u_volt.
   *
   * Return: matching *opp, else returns ERR_PTR in case of error which should be
   * handled using IS_ERR.
   *
   * Error return values can be:
   * EINVAL:	bad parameters
   *
   * The callers are required to call dev_pm_opp_put() for the returned OPP after
   * use.
   */
  struct dev_pm_opp *dev_pm_opp_find_freq_ceil_by_volt(struct device *dev,
  						     unsigned long u_volt)
  {
  	struct opp_table *opp_table;
  	struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
  
  	if (!dev || !u_volt) {
  		dev_err(dev, "%s: Invalid argument volt=%lu
  ", __func__,
  			u_volt);
  		return ERR_PTR(-EINVAL);
  	}
  
  	opp_table = _find_opp_table(dev);
  	if (IS_ERR(opp_table))
  		return ERR_CAST(opp_table);
  
  	mutex_lock(&opp_table->lock);
  
  	list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
  		if (temp_opp->available) {
  			if (temp_opp->supplies[0].u_volt > u_volt)
  				break;
  			opp = temp_opp;
  		}
  	}
  
  	/* Increment the reference count of OPP */
  	if (!IS_ERR(opp))
  		dev_pm_opp_get(opp);
  
  	mutex_unlock(&opp_table->lock);
  	dev_pm_opp_put_opp_table(opp_table);
  
  	return opp;
  }
  EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil_by_volt);

  static int _set_opp_voltage(struct device *dev, struct regulator *reg,

  			    struct dev_pm_opp_supply *supply)

  {
  	int ret;
  
  	/* Regulator not available for device */
  	if (IS_ERR(reg)) {
  		dev_dbg(dev, "%s: regulator not available: %ld
  ", __func__,
  			PTR_ERR(reg));
  		return 0;
  	}

  	dev_dbg(dev, "%s: voltages (mV): %lu %lu %lu
  ", __func__,
  		supply->u_volt_min, supply->u_volt, supply->u_volt_max);

  	ret = regulator_set_voltage_triplet(reg, supply->u_volt_min,
  					    supply->u_volt, supply->u_volt_max);

  	if (ret)
  		dev_err(dev, "%s: failed to set voltage (%lu %lu %lu mV): %d
  ",

  			__func__, supply->u_volt_min, supply->u_volt,
  			supply->u_volt_max, ret);

  
  	return ret;
  }

  static inline int _generic_set_opp_clk_only(struct device *dev, struct clk *clk,
  					    unsigned long freq)

  {
  	int ret;
  
  	ret = clk_set_rate(clk, freq);
  	if (ret) {
  		dev_err(dev, "%s: failed to set clock rate: %d
  ", __func__,
  			ret);
  	}
  
  	return ret;
  }

  static int _generic_set_opp_regulator(struct opp_table *opp_table,

  				      struct device *dev,
  				      unsigned long old_freq,
  				      unsigned long freq,
  				      struct dev_pm_opp_supply *old_supply,
  				      struct dev_pm_opp_supply *new_supply)

  {

  	struct regulator *reg = opp_table->regulators[0];

  	int ret;
  
  	/* This function only supports single regulator per device */

  	if (WARN_ON(opp_table->regulator_count > 1)) {

  		dev_err(dev, "multiple regulators are not supported
  ");
  		return -EINVAL;
  	}
  
  	/* Scaling up? Scale voltage before frequency */

  	if (freq >= old_freq) {

  		ret = _set_opp_voltage(dev, reg, new_supply);
  		if (ret)
  			goto restore_voltage;
  	}
  
  	/* Change frequency */

  	ret = _generic_set_opp_clk_only(dev, opp_table->clk, freq);

  	if (ret)
  		goto restore_voltage;
  
  	/* Scaling down? Scale voltage after frequency */
  	if (freq < old_freq) {
  		ret = _set_opp_voltage(dev, reg, new_supply);
  		if (ret)
  			goto restore_freq;
  	}

  	/*
  	 * Enable the regulator after setting its voltages, otherwise it breaks
  	 * some boot-enabled regulators.
  	 */

  	if (unlikely(!opp_table->enabled)) {

  		ret = regulator_enable(reg);
  		if (ret < 0)
  			dev_warn(dev, "Failed to enable regulator: %d", ret);

  	}

  	return 0;
  
  restore_freq:

  	if (_generic_set_opp_clk_only(dev, opp_table->clk, old_freq))

  		dev_err(dev, "%s: failed to restore old-freq (%lu Hz)
  ",
  			__func__, old_freq);
  restore_voltage:
  	/* This shouldn't harm even if the voltages weren't updated earlier */

  	if (old_supply)

  		_set_opp_voltage(dev, reg, old_supply);
  
  	return ret;
  }

  static int _set_opp_bw(const struct opp_table *opp_table,
  		       struct dev_pm_opp *opp, struct device *dev, bool remove)
  {
  	u32 avg, peak;
  	int i, ret;
  
  	if (!opp_table->paths)
  		return 0;
  
  	for (i = 0; i < opp_table->path_count; i++) {
  		if (remove) {
  			avg = 0;
  			peak = 0;
  		} else {
  			avg = opp->bandwidth[i].avg;
  			peak = opp->bandwidth[i].peak;
  		}
  		ret = icc_set_bw(opp_table->paths[i], avg, peak);
  		if (ret) {
  			dev_err(dev, "Failed to %s bandwidth[%d]: %d
  ",
  				remove ? "remove" : "set", i, ret);
  			return ret;
  		}
  	}
  
  	return 0;
  }

  static int _set_opp_custom(const struct opp_table *opp_table,
  			   struct device *dev, unsigned long old_freq,
  			   unsigned long freq,
  			   struct dev_pm_opp_supply *old_supply,
  			   struct dev_pm_opp_supply *new_supply)
  {
  	struct dev_pm_set_opp_data *data;
  	int size;
  
  	data = opp_table->set_opp_data;
  	data->regulators = opp_table->regulators;
  	data->regulator_count = opp_table->regulator_count;
  	data->clk = opp_table->clk;
  	data->dev = dev;
  
  	data->old_opp.rate = old_freq;
  	size = sizeof(*old_supply) * opp_table->regulator_count;

  	if (!old_supply)

  		memset(data->old_opp.supplies, 0, size);
  	else
  		memcpy(data->old_opp.supplies, old_supply, size);
  
  	data->new_opp.rate = freq;
  	memcpy(data->new_opp.supplies, new_supply, size);
  
  	return opp_table->set_opp(data);
  }

  static int _set_required_opp(struct device *dev, struct device *pd_dev,
  			     struct dev_pm_opp *opp, int i)
  {
  	unsigned int pstate = likely(opp) ? opp->required_opps[i]->pstate : 0;
  	int ret;
  
  	if (!pd_dev)
  		return 0;
  
  	ret = dev_pm_genpd_set_performance_state(pd_dev, pstate);
  	if (ret) {
  		dev_err(dev, "Failed to set performance rate of %s: %d (%d)
  ",
  			dev_name(pd_dev), pstate, ret);
  	}
  
  	return ret;
  }

  /* This is only called for PM domain for now */
  static int _set_required_opps(struct device *dev,
  			      struct opp_table *opp_table,

  			      struct dev_pm_opp *opp, bool up)

  {
  	struct opp_table **required_opp_tables = opp_table->required_opp_tables;
  	struct device **genpd_virt_devs = opp_table->genpd_virt_devs;

  	int i, ret = 0;
  
  	if (!required_opp_tables)
  		return 0;
  
  	/* Single genpd case */

  	if (!genpd_virt_devs)
  		return _set_required_opp(dev, dev, opp, 0);

  
  	/* Multiple genpd case */
  
  	/*
  	 * Acquire genpd_virt_dev_lock to make sure we don't use a genpd_dev
  	 * after it is freed from another thread.
  	 */
  	mutex_lock(&opp_table->genpd_virt_dev_lock);

  	/* Scaling up? Set required OPPs in normal order, else reverse */
  	if (up) {
  		for (i = 0; i < opp_table->required_opp_count; i++) {
  			ret = _set_required_opp(dev, genpd_virt_devs[i], opp, i);
  			if (ret)
  				break;
  		}
  	} else {
  		for (i = opp_table->required_opp_count - 1; i >= 0; i--) {
  			ret = _set_required_opp(dev, genpd_virt_devs[i], opp, i);
  			if (ret)
  				break;

  		}
  	}

  	mutex_unlock(&opp_table->genpd_virt_dev_lock);
  
  	return ret;
  }

  /**

   * dev_pm_opp_set_bw() - sets bandwidth levels corresponding to an opp
   * @dev:	device for which we do this operation
   * @opp:	opp based on which the bandwidth levels are to be configured
   *
   * This configures the bandwidth to the levels specified by the OPP. However
   * if the OPP specified is NULL the bandwidth levels are cleared out.
   *
   * Return: 0 on success or a negative error value.
   */
  int dev_pm_opp_set_bw(struct device *dev, struct dev_pm_opp *opp)
  {
  	struct opp_table *opp_table;
  	int ret;
  
  	opp_table = _find_opp_table(dev);
  	if (IS_ERR(opp_table)) {
  		dev_err(dev, "%s: device opp table doesn't exist
  ", __func__);
  		return PTR_ERR(opp_table);
  	}
  
  	if (opp)
  		ret = _set_opp_bw(opp_table, opp, dev, false);
  	else
  		ret = _set_opp_bw(opp_table, NULL, dev, true);
  
  	dev_pm_opp_put_opp_table(opp_table);
  	return ret;
  }
  EXPORT_SYMBOL_GPL(dev_pm_opp_set_bw);

  static int _opp_set_rate_zero(struct device *dev, struct opp_table *opp_table)
  {
  	int ret;
  
  	if (!opp_table->enabled)
  		return 0;
  
  	/*
  	 * Some drivers need to support cases where some platforms may
  	 * have OPP table for the device, while others don't and
  	 * opp_set_rate() just needs to behave like clk_set_rate().
  	 */
  	if (!_get_opp_count(opp_table))
  		return 0;
  
  	ret = _set_opp_bw(opp_table, NULL, dev, true);
  	if (ret)
  		return ret;
  
  	if (opp_table->regulators)
  		regulator_disable(opp_table->regulators[0]);

  	ret = _set_required_opps(dev, opp_table, NULL, false);

  
  	opp_table->enabled = false;
  	return ret;
  }

  /**

   * dev_pm_opp_set_rate() - Configure new OPP based on frequency
   * @dev:	 device for which we do this operation
   * @target_freq: frequency to achieve
   *

   * This configures the power-supplies to the levels specified by the OPP
   * corresponding to the target_freq, and programs the clock to a value <=
   * target_freq, as rounded by clk_round_rate(). Device wanting to run at fmax
   * provided by the opp, should have already rounded to the target OPP's
   * frequency.

   */
  int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
  {

  	struct opp_table *opp_table;

  	unsigned long freq, old_freq, temp_freq;

  	struct dev_pm_opp *old_opp, *opp;

  	struct clk *clk;

  	int ret;

  	opp_table = _find_opp_table(dev);
  	if (IS_ERR(opp_table)) {
  		dev_err(dev, "%s: device opp doesn't exist
  ", __func__);
  		return PTR_ERR(opp_table);
  	}

  	if (unlikely(!target_freq)) {

  		ret = _opp_set_rate_zero(dev, opp_table);

  		goto put_opp_table;
  	}

  	clk = opp_table->clk;
  	if (IS_ERR(clk)) {
  		dev_err(dev, "%s: No clock available for the device
  ",
  			__func__);
  		ret = PTR_ERR(clk);
  		goto put_opp_table;
  	}

  
  	freq = clk_round_rate(clk, target_freq);
  	if ((long)freq <= 0)
  		freq = target_freq;
  
  	old_freq = clk_get_rate(clk);
  
  	/* Return early if nothing to do */

  	if (opp_table->enabled && old_freq == freq) {
  		dev_dbg(dev, "%s: old/new frequencies (%lu Hz) are same, nothing to do
  ",
  			__func__, freq);
  		ret = 0;
  		goto put_opp_table;

  	}

  	/*
  	 * For IO devices which require an OPP on some platforms/SoCs
  	 * while just needing to scale the clock on some others
  	 * we look for empty OPP tables with just a clock handle and
  	 * scale only the clk. This makes dev_pm_opp_set_rate()
  	 * equivalent to a clk_set_rate()
  	 */
  	if (!_get_opp_count(opp_table)) {
  		ret = _generic_set_opp_clk_only(dev, clk, freq);
  		goto put_opp_table;
  	}

  	temp_freq = old_freq;
  	old_opp = _find_freq_ceil(opp_table, &temp_freq);

  	if (IS_ERR(old_opp)) {

  		dev_err(dev, "%s: failed to find current OPP for freq %lu (%ld)
  ",
  			__func__, old_freq, PTR_ERR(old_opp));
  	}

  	temp_freq = freq;
  	opp = _find_freq_ceil(opp_table, &temp_freq);

  	if (IS_ERR(opp)) {
  		ret = PTR_ERR(opp);
  		dev_err(dev, "%s: failed to find OPP for freq %lu (%d)
  ",
  			__func__, freq, ret);

  		goto put_old_opp;

  	}

  	dev_dbg(dev, "%s: switching OPP: %lu Hz --> %lu Hz
  ", __func__,
  		old_freq, freq);

  	/* Scaling up? Configure required OPPs before frequency */

  	if (freq >= old_freq) {

  		ret = _set_required_opps(dev, opp_table, opp, true);

  		if (ret)
  			goto put_opp;
  	}

  	if (opp_table->set_opp) {
  		ret = _set_opp_custom(opp_table, dev, old_freq, freq,
  				      IS_ERR(old_opp) ? NULL : old_opp->supplies,
  				      opp->supplies);
  	} else if (opp_table->regulators) {

  		ret = _generic_set_opp_regulator(opp_table, dev, old_freq, freq,
  						 IS_ERR(old_opp) ? NULL : old_opp->supplies,
  						 opp->supplies);
  	} else {

  		/* Only frequency scaling */

  		ret = _generic_set_opp_clk_only(dev, clk, freq);

  	}

  	/* Scaling down? Configure required OPPs after frequency */
  	if (!ret && freq < old_freq) {

  		ret = _set_required_opps(dev, opp_table, opp, false);

  		if (ret)
  			dev_err(dev, "Failed to set required opps: %d
  ", ret);

  	}

  	if (!ret) {

  		ret = _set_opp_bw(opp_table, opp, dev, false);

  		if (!ret)
  			opp_table->enabled = true;
  	}

  put_opp:

  	dev_pm_opp_put(opp);

  put_old_opp:

  	if (!IS_ERR(old_opp))
  		dev_pm_opp_put(old_opp);

  put_opp_table:

  	dev_pm_opp_put_opp_table(opp_table);

  	return ret;

  }
  EXPORT_SYMBOL_GPL(dev_pm_opp_set_rate);

  /* OPP-dev Helpers */

  static void _remove_opp_dev(struct opp_device *opp_dev,
  			    struct opp_table *opp_table)

  {

  	opp_debug_unregister(opp_dev, opp_table);
  	list_del(&opp_dev->node);

  	kfree(opp_dev);

  }

  static struct opp_device *_add_opp_dev_unlocked(const struct device *dev,
  						struct opp_table *opp_table)

  {

  	struct opp_device *opp_dev;

  	opp_dev = kzalloc(sizeof(*opp_dev), GFP_KERNEL);
  	if (!opp_dev)

  		return NULL;

  	/* Initialize opp-dev */
  	opp_dev->dev = dev;

  	list_add(&opp_dev->node, &opp_table->dev_list);

  	/* Create debugfs entries for the opp_table */

  	opp_debug_register(opp_dev, opp_table);

  
  	return opp_dev;
  }
  
  struct opp_device *_add_opp_dev(const struct device *dev,
  				struct opp_table *opp_table)
  {
  	struct opp_device *opp_dev;
  
  	mutex_lock(&opp_table->lock);
  	opp_dev = _add_opp_dev_unlocked(dev, opp_table);

  	mutex_unlock(&opp_table->lock);

  	return opp_dev;

  }

  static struct opp_table *_allocate_opp_table(struct device *dev, int index)

  {

  	struct opp_table *opp_table;
  	struct opp_device *opp_dev;

  	int ret;

  
  	/*

  	 * Allocate a new OPP table. In the infrequent case where a new

  	 * device is needed to be added, we pay this penalty.
  	 */

  	opp_table = kzalloc(sizeof(*opp_table), GFP_KERNEL);
  	if (!opp_table)

  		return ERR_PTR(-ENOMEM);

  	mutex_init(&opp_table->lock);

  	mutex_init(&opp_table->genpd_virt_dev_lock);

  	INIT_LIST_HEAD(&opp_table->dev_list);

  	/* Mark regulator count uninitialized */
  	opp_table->regulator_count = -1;

  	opp_dev = _add_opp_dev(dev, opp_table);
  	if (!opp_dev) {

  		ret = -ENOMEM;
  		goto err;

  	}

  	_of_init_opp_table(opp_table, dev, index);

  	/* Find clk for the device */

  	opp_table->clk = clk_get(dev, NULL);
  	if (IS_ERR(opp_table->clk)) {
  		ret = PTR_ERR(opp_table->clk);

  		if (ret == -EPROBE_DEFER)

  			goto remove_opp_dev;

  
  		dev_dbg(dev, "%s: Couldn't find clock: %d
  ", __func__, ret);

  	}

  	/* Find interconnect path(s) for the device */
  	ret = dev_pm_opp_of_find_icc_paths(dev, opp_table);

  	if (ret) {
  		if (ret == -EPROBE_DEFER)

  			goto put_clk;

  		dev_warn(dev, "%s: Error finding interconnect paths: %d
  ",
  			 __func__, ret);

  	}

  	BLOCKING_INIT_NOTIFIER_HEAD(&opp_table->head);

  	INIT_LIST_HEAD(&opp_table->opp_list);

  	kref_init(&opp_table->kref);

  	/* Secure the device table modification */

  	list_add(&opp_table->node, &opp_tables);

  	return opp_table;

  put_clk:
  	if (!IS_ERR(opp_table->clk))
  		clk_put(opp_table->clk);

  remove_opp_dev:
  	_remove_opp_dev(opp_dev, opp_table);

  err:
  	kfree(opp_table);
  	return ERR_PTR(ret);

  }

  void _get_opp_table_kref(struct opp_table *opp_table)

  {

  	kref_get(&opp_table->kref);
  }

  static struct opp_table *_opp_get_opp_table(struct device *dev, int index)

  {
  	struct opp_table *opp_table;
  
  	/* Hold our table modification lock here */
  	mutex_lock(&opp_table_lock);

  	opp_table = _find_opp_table_unlocked(dev);
  	if (!IS_ERR(opp_table))

  		goto unlock;

  	opp_table = _managed_opp(dev, index);
  	if (opp_table) {
  		if (!_add_opp_dev_unlocked(dev, opp_table)) {
  			dev_pm_opp_put_opp_table(opp_table);

  			opp_table = ERR_PTR(-ENOMEM);

  		}
  		goto unlock;
  	}

  	opp_table = _allocate_opp_table(dev, index);

  
  unlock:
  	mutex_unlock(&opp_table_lock);
  
  	return opp_table;
  }

  
  struct opp_table *dev_pm_opp_get_opp_table(struct device *dev)
  {
  	return _opp_get_opp_table(dev, 0);
  }

  EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_table);

  struct opp_table *dev_pm_opp_get_opp_table_indexed(struct device *dev,
  						   int index)
  {
  	return _opp_get_opp_table(dev, index);
  }

  static void _opp_table_kref_release(struct kref *kref)

  {
  	struct opp_table *opp_table = container_of(kref, struct opp_table, kref);

  	struct opp_device *opp_dev, *temp;

  	int i;

  	/* Drop the lock as soon as we can */
  	list_del(&opp_table->node);
  	mutex_unlock(&opp_table_lock);

  	_of_clear_opp_table(opp_table);

  	/* Release clk */
  	if (!IS_ERR(opp_table->clk))
  		clk_put(opp_table->clk);

  	if (opp_table->paths) {
  		for (i = 0; i < opp_table->path_count; i++)
  			icc_put(opp_table->paths[i]);
  		kfree(opp_table->paths);
  	}

  	WARN_ON(!list_empty(&opp_table->opp_list));

  	list_for_each_entry_safe(opp_dev, temp, &opp_table->dev_list, node) {
  		/*
  		 * The OPP table is getting removed, drop the performance state
  		 * constraints.
  		 */
  		if (opp_table->genpd_performance_state)
  			dev_pm_genpd_set_performance_state((struct device *)(opp_dev->dev), 0);

  		_remove_opp_dev(opp_dev, opp_table);
  	}

  	mutex_destroy(&opp_table->genpd_virt_dev_lock);

  	mutex_destroy(&opp_table->lock);

  	kfree(opp_table);

  }
  
  void dev_pm_opp_put_opp_table(struct opp_table *opp_table)
  {
  	kref_put_mutex(&opp_table->kref, _opp_table_kref_release,
  		       &opp_table_lock);
  }
  EXPORT_SYMBOL_GPL(dev_pm_opp_put_opp_table);

  void _opp_free(struct dev_pm_opp *opp)

  {
  	kfree(opp);

  }

  static void _opp_kref_release(struct dev_pm_opp *opp,
  			      struct opp_table *opp_table)

  {
  	/*
  	 * Notify the changes in the availability of the operable
  	 * frequency/voltage list.
  	 */

  	blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_REMOVE, opp);

  	_of_opp_free_required_opps(opp_table, opp);

  	opp_debug_remove_one(opp);

  	list_del(&opp->node);
  	kfree(opp);

  }

  static void _opp_kref_release_unlocked(struct kref *kref)
  {
  	struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref);
  	struct opp_table *opp_table = opp->opp_table;
  
  	_opp_kref_release(opp, opp_table);
  }
  
  static void _opp_kref_release_locked(struct kref *kref)
  {
  	struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref);
  	struct opp_table *opp_table = opp->opp_table;
  
  	_opp_kref_release(opp, opp_table);

  	mutex_unlock(&opp_table->lock);

  }

  void dev_pm_opp_get(struct dev_pm_opp *opp)

  {
  	kref_get(&opp->kref);
  }

  void dev_pm_opp_put(struct dev_pm_opp *opp)
  {

  	kref_put_mutex(&opp->kref, _opp_kref_release_locked,
  		       &opp->opp_table->lock);

  }
  EXPORT_SYMBOL_GPL(dev_pm_opp_put);

  static void dev_pm_opp_put_unlocked(struct dev_pm_opp *opp)
  {
  	kref_put(&opp->kref, _opp_kref_release_unlocked);
  }

  /**

   * dev_pm_opp_remove()  - Remove an OPP from OPP table

   * @dev:	device for which we do this operation
   * @freq:	OPP to remove with matching 'freq'
   *

   * This function removes an opp from the opp table.

   */
  void dev_pm_opp_remove(struct device *dev, unsigned long freq)
  {
  	struct dev_pm_opp *opp;

  	struct opp_table *opp_table;

  	bool found = false;

  	opp_table = _find_opp_table(dev);
  	if (IS_ERR(opp_table))

  		return;

  	mutex_lock(&opp_table->lock);

  	list_for_each_entry(opp, &opp_table->opp_list, node) {

  		if (opp->rate == freq) {
  			found = true;
  			break;
  		}
  	}

  	mutex_unlock(&opp_table->lock);

  	if (found) {
  		dev_pm_opp_put(opp);

  
  		/* Drop the reference taken by dev_pm_opp_add() */
  		dev_pm_opp_put_opp_table(opp_table);

  	} else {

  		dev_warn(dev, "%s: Couldn't find OPP with freq: %lu
  ",
  			 __func__, freq);

  	}

  	/* Drop the reference taken by _find_opp_table() */

  	dev_pm_opp_put_opp_table(opp_table);

  }
  EXPORT_SYMBOL_GPL(dev_pm_opp_remove);

  bool _opp_remove_all_static(struct opp_table *opp_table)

  {
  	struct dev_pm_opp *opp, *tmp;

  	bool ret = true;

  
  	mutex_lock(&opp_table->lock);

  	if (!opp_table->parsed_static_opps) {
  		ret = false;
  		goto unlock;
  	}
  
  	if (--opp_table->parsed_static_opps)

  		goto unlock;
  
  	list_for_each_entry_safe(opp, tmp, &opp_table->opp_list, node) {
  		if (!opp->dynamic)
  			dev_pm_opp_put_unlocked(opp);
  	}
  
  unlock:
  	mutex_unlock(&opp_table->lock);

  
  	return ret;

  }

  /**
   * dev_pm_opp_remove_all_dynamic() - Remove all dynamically created OPPs
   * @dev:	device for which we do this operation
   *
   * This function removes all dynamically created OPPs from the opp table.
   */
  void dev_pm_opp_remove_all_dynamic(struct device *dev)
  {
  	struct opp_table *opp_table;
  	struct dev_pm_opp *opp, *temp;
  	int count = 0;
  
  	opp_table = _find_opp_table(dev);
  	if (IS_ERR(opp_table))
  		return;
  
  	mutex_lock(&opp_table->lock);
  	list_for_each_entry_safe(opp, temp, &opp_table->opp_list, node) {
  		if (opp->dynamic) {
  			dev_pm_opp_put_unlocked(opp);
  			count++;
  		}
  	}
  	mutex_unlock(&opp_table->lock);
  
  	/* Drop the references taken by dev_pm_opp_add() */
  	while (count--)
  		dev_pm_opp_put_opp_table(opp_table);
  
  	/* Drop the reference taken by _find_opp_table() */
  	dev_pm_opp_put_opp_table(opp_table);
  }
  EXPORT_SYMBOL_GPL(dev_pm_opp_remove_all_dynamic);

  struct dev_pm_opp *_opp_allocate(struct opp_table *table)

  {

  	struct dev_pm_opp *opp;

  	int supply_count, supply_size, icc_size;

  	/* Allocate space for at least one supply */

  	supply_count = table->regulator_count > 0 ? table->regulator_count : 1;
  	supply_size = sizeof(*opp->supplies) * supply_count;
  	icc_size = sizeof(*opp->bandwidth) * table->path_count;

  	/* allocate new OPP node and supplies structures */

  	opp = kzalloc(sizeof(*opp) + supply_size + icc_size, GFP_KERNEL);

  	if (!opp)

  		return NULL;

  	/* Put the supplies at the end of the OPP structure as an empty array */
  	opp->supplies = (struct dev_pm_opp_supply *)(opp + 1);

  	if (icc_size)
  		opp->bandwidth = (struct dev_pm_opp_icc_bw *)(opp->supplies + supply_count);

  	INIT_LIST_HEAD(&opp->node);

  	return opp;
  }

  static bool _opp_supported_by_regulators(struct dev_pm_opp *opp,

  					 struct opp_table *opp_table)

  {

  	struct regulator *reg;
  	int i;

  	if (!opp_table->regulators)
  		return true;

  	for (i = 0; i < opp_table->regulator_count; i++) {
  		reg = opp_table->regulators[i];
  
  		if (!regulator_is_supported_voltage(reg,
  					opp->supplies[i].u_volt_min,
  					opp->supplies[i].u_volt_max)) {
  			pr_warn("%s: OPP minuV: %lu maxuV: %lu, not supported by regulator
  ",
  				__func__, opp->supplies[i].u_volt_min,
  				opp->supplies[i].u_volt_max);
  			return false;
  		}

  	}
  
  	return true;
  }

  int _opp_compare_key(struct dev_pm_opp *opp1, struct dev_pm_opp *opp2)
  {
  	if (opp1->rate != opp2->rate)
  		return opp1->rate < opp2->rate ? -1 : 1;

  	if (opp1->bandwidth && opp2->bandwidth &&
  	    opp1->bandwidth[0].peak != opp2->bandwidth[0].peak)
  		return opp1->bandwidth[0].peak < opp2->bandwidth[0].peak ? -1 : 1;

  	if (opp1->level != opp2->level)
  		return opp1->level < opp2->level ? -1 : 1;
  	return 0;
  }

  static int _opp_is_duplicate(struct device *dev, struct dev_pm_opp *new_opp,
  			     struct opp_table *opp_table,
  			     struct list_head **head)

  {
  	struct dev_pm_opp *opp;

  	int opp_cmp;

  
  	/*
  	 * Insert new OPP in order of increasing frequency and discard if
  	 * already present.
  	 *

  	 * Need to use &opp_table->opp_list in the condition part of the 'for'

  	 * loop, don't replace it with head otherwise it will become an infinite
  	 * loop.
  	 */

  	list_for_each_entry(opp, &opp_table->opp_list, node) {

  		opp_cmp = _opp_compare_key(new_opp, opp);
  		if (opp_cmp > 0) {

  			*head = &opp->node;

  			continue;
  		}

  		if (opp_cmp < 0)

  			return 0;

  
  		/* Duplicate OPPs */

  		dev_warn(dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d
  ",

  			 __func__, opp->rate, opp->supplies[0].u_volt,
  			 opp->available, new_opp->rate,
  			 new_opp->supplies[0].u_volt, new_opp->available);

  		/* Should we compare voltages for all regulators here ? */

  		return opp->available &&
  		       new_opp->supplies[0].u_volt == opp->supplies[0].u_volt ? -EBUSY : -EEXIST;
  	}
  
  	return 0;
  }
  
  /*
   * Returns:
   * 0: On success. And appropriate error message for duplicate OPPs.
   * -EBUSY: For OPP with same freq/volt and is available. The callers of
   *  _opp_add() must return 0 if they receive -EBUSY from it. This is to make
   *  sure we don't print error messages unnecessarily if different parts of
   *  kernel try to initialize the OPP table.
   * -EEXIST: For OPP with same freq but different volt or is unavailable. This
   *  should be considered an error by the callers of _opp_add().
   */
  int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
  	     struct opp_table *opp_table, bool rate_not_available)
  {
  	struct list_head *head;
  	int ret;
  
  	mutex_lock(&opp_table->lock);
  	head = &opp_table->opp_list;

  	if (likely(!rate_not_available)) {
  		ret = _opp_is_duplicate(dev, new_opp, opp_table, &head);
  		if (ret) {
  			mutex_unlock(&opp_table->lock);
  			return ret;
  		}

  	}

  	list_add(&new_opp->node, head);

  	mutex_unlock(&opp_table->lock);
  
  	new_opp->opp_table = opp_table;

  	kref_init(&new_opp->kref);

  	opp_debug_create_one(new_opp, opp_table);

  	if (!_opp_supported_by_regulators(new_opp, opp_table)) {

  		new_opp->available = false;
  		dev_warn(dev, "%s: OPP not supported by regulators (%lu)
  ",
  			 __func__, new_opp->rate);
  	}

  	return 0;
  }

  /**

   * _opp_add_v1() - Allocate a OPP based on v1 bindings.

   * @opp_table:	OPP table

   * @dev:	device for which we do this operation
   * @freq:	Frequency in Hz for this OPP
   * @u_volt:	Voltage in uVolts for this OPP
   * @dynamic:	Dynamically added OPPs.
   *

   * This function adds an opp definition to the opp table and returns status.

   * The opp is made available by default and it can be controlled using
   * dev_pm_opp_enable/disable functions and may be removed by dev_pm_opp_remove.
   *

   * NOTE: "dynamic" parameter impacts OPPs added by the dev_pm_opp_of_add_table
   * and freed by dev_pm_opp_of_remove_table.

   *

   * 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
   */

  int _opp_add_v1(struct opp_table *opp_table, struct device *dev,
  		unsigned long freq, long u_volt, bool dynamic)

  {

  	struct dev_pm_opp *new_opp;

  	unsigned long tol;

  	int ret;

  	new_opp = _opp_allocate(opp_table);
  	if (!new_opp)
  		return -ENOMEM;

  	/* populate the opp table */

  	new_opp->rate = freq;

  	tol = u_volt * opp_table->voltage_tolerance_v1 / 100;

  	new_opp->supplies[0].u_volt = u_volt;
  	new_opp->supplies[0].u_volt_min = u_volt - tol;
  	new_opp->supplies[0].u_volt_max = u_volt + tol;

  	new_opp->available = true;

  	new_opp->dynamic = dynamic;

  	ret = _opp_add(dev, new_opp, opp_table, false);

  	if (ret) {
  		/* Don't return error for duplicate OPPs */
  		if (ret == -EBUSY)
  			ret = 0;

  		goto free_opp;

  	}

  	/*
  	 * 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 0;

  
  free_opp:

  	_opp_free(new_opp);

  	return ret;

  }

  /**

   * dev_pm_opp_set_supported_hw() - Set supported platforms
   * @dev: Device for which supported-hw has to be set.
   * @versions: Array of hierarchy of versions to match.
   * @count: Number of elements in the array.
   *
   * This is required only for the V2 bindings, and it enables a platform to
   * specify the hierarchy of versions it supports. OPP layer will then enable
   * OPPs, which are available for those versions, based on its 'opp-supported-hw'
   * property.

   */

  struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev,
  			const u32 *versions, unsigned int count)

  {

  	struct opp_table *opp_table;

  	opp_table = dev_pm_opp_get_opp_table(dev);

  	if (IS_ERR(opp_table))
  		return opp_table;

  	/* Make sure there are no concurrent readers while updating opp_table */
  	WARN_ON(!list_empty(&opp_table->opp_list));

  	/* Another CPU that shares the OPP table has set the property ? */
  	if (opp_table->supported_hw)
  		return opp_table;

  	opp_table->supported_hw = kmemdup(versions, count * sizeof(*versions),

  					GFP_KERNEL);

  	if (!opp_table->supported_hw) {

  		dev_pm_opp_put_opp_table(opp_table);
  		return ERR_PTR(-ENOMEM);

  	}

  	opp_table->supported_hw_count = count;

  
  	return opp_table;

  }
  EXPORT_SYMBOL_GPL(dev_pm_opp_set_supported_hw);
  
  /**
   * dev_pm_opp_put_supported_hw() - Releases resources blocked for supported hw

   * @opp_table: OPP table returned by dev_pm_opp_set_supported_hw().

   *
   * This is required only for the V2 bindings, and is called for a matching

   * dev_pm_opp_set_supported_hw(). Until this is called, the opp_table structure

   * will not be freed.

   */

  void dev_pm_opp_put_supported_hw(struct opp_table *opp_table)

  {

  	/* Make sure there are no concurrent readers while updating opp_table */
  	WARN_ON(!list_empty(&opp_table->opp_list));

  	kfree(opp_table->supported_hw);
  	opp_table->supported_hw = NULL;
  	opp_table->supported_hw_count = 0;

  	dev_pm_opp_put_opp_table(opp_table);

  }
  EXPORT_SYMBOL_GPL(dev_pm_opp_put_supported_hw);

  /**
   * dev_pm_opp_set_prop_name() - Set prop-extn name

   * @dev: Device for which the prop-name has to be set.

   * @name: name to postfix to properties.
   *
   * This is required only for the V2 bindings, and it enables a platform to
   * specify the extn to be used for certain property names. The properties to
   * which the extension will apply are opp-microvolt and opp-microamp. OPP core
   * should postfix the property name with -<name> while looking for them.

   */

  struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name)

  {

  	struct opp_table *opp_table;

  	opp_table = dev_pm_opp_get_opp_table(dev);

  	if (IS_ERR(opp_table))
  		return opp_table;

  	/* Make sure there are no concurrent readers while updating opp_table */
  	WARN_ON(!list_empty(&opp_table->opp_list));

  	/* Another CPU that shares the OPP table has set the property ? */
  	if (opp_table->prop_name)
  		return opp_table;