Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

8 files changed, 6026 insertions, 0 deletions

diff --git a/drivers/opp/Kconfig b/drivers/opp/Kconfig
new file mode 100644
index 0000000000..d7c649a1a9
--- /dev/null
+++ b/drivers/opp/Kconfig
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config PM_OPP
+	bool
+	help
+	  SOCs have a standard set of tuples consisting of frequency and
+	  voltage pairs that the device will support per voltage domain. This
+	  is called Operating Performance Point or OPP. The actual definitions
+	  of OPP varies over silicon within the same family of devices.
+
+	  OPP layer organizes the data internally using device pointers
+	  representing individual voltage domains and provides SOC
+	  implementations a ready to use framework to manage OPPs.
+	  For more information, read <file:Documentation/power/opp.rst>
diff --git a/drivers/opp/Makefile b/drivers/opp/Makefile
new file mode 100644
index 0000000000..f65ed5985b
--- /dev/null
+++ b/drivers/opp/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0-only
+ccflags-$(CONFIG_DEBUG_DRIVER)	:= -DDEBUG
+obj-y				+= core.o cpu.o
+obj-$(CONFIG_OF)		+= of.o
+obj-$(CONFIG_DEBUG_FS)		+= debugfs.o
+obj-$(CONFIG_ARM_TI_CPUFREQ)	+= ti-opp-supply.o
diff --git a/drivers/opp/core.c b/drivers/opp/core.c
new file mode 100644
index 0000000000..bceb27b1ba
--- /dev/null
+++ b/drivers/opp/core.c
@@ -0,0 +1,3177 @@
+// 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/device.h>
+#include <linux/export.h>
+#include <linux/pm_domain.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+#include <linux/xarray.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);
+/* Flag indicating that opp_tables list is being updated at the moment */
+static bool opp_tables_busy;
+
+/* OPP ID allocator */
+static DEFINE_XARRAY_ALLOC1(opp_configs);
+
+static bool _find_opp_dev(const struct device *dev, struct opp_table *opp_table)
+{
+	struct opp_device *opp_dev;
+	bool found = false;
+
+	mutex_lock(&opp_table->lock);
+	list_for_each_entry(opp_dev, &opp_table->dev_list, node)
+		if (opp_dev->dev == dev) {
+			found = true;
+			break;
+		}
+
+	mutex_unlock(&opp_table->lock);
+	return found;
+}
+
+static struct opp_table *_find_opp_table_unlocked(struct device *dev)
+{
+	struct opp_table *opp_table;
+
+	list_for_each_entry(opp_table, &opp_tables, node) {
+		if (_find_opp_dev(dev, opp_table)) {
+			_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\n", __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;
+}
+
+/*
+ * Returns true if multiple clocks aren't there, else returns false with WARN.
+ *
+ * We don't force clk_count == 1 here as there are users who don't have a clock
+ * representation in the OPP table and manage the clock configuration themselves
+ * in an platform specific way.
+ */
+static bool assert_single_clk(struct opp_table *opp_table)
+{
+	return !WARN_ON(opp_table->clk_count > 1);
+}
+
+/**
+ * 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\n", __func__);
+		return 0;
+	}
+
+	return opp->supplies[0].u_volt;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_get_voltage);
+
+/**
+ * dev_pm_opp_get_supplies() - Gets the supply information corresponding to an opp
+ * @opp:	opp for which voltage has to be returned for
+ * @supplies:	Placeholder for copying the supply information.
+ *
+ * Return: negative error number on failure, 0 otherwise on success after
+ * setting @supplies.
+ *
+ * This can be used for devices with any number of power supplies. The caller
+ * must ensure the @supplies array must contain space for each regulator.
+ */
+int dev_pm_opp_get_supplies(struct dev_pm_opp *opp,
+			    struct dev_pm_opp_supply *supplies)
+{
+	if (IS_ERR_OR_NULL(opp) || !supplies) {
+		pr_err("%s: Invalid parameters\n", __func__);
+		return -EINVAL;
+	}
+
+	memcpy(supplies, opp->supplies,
+	       sizeof(*supplies) * opp->opp_table->regulator_count);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_get_supplies);
+
+/**
+ * dev_pm_opp_get_power() - Gets the power corresponding to an opp
+ * @opp:	opp for which power has to be returned for
+ *
+ * Return: power in micro watt corresponding to the opp, else
+ * return 0
+ *
+ * This is useful only for devices with single power supply.
+ */
+unsigned long dev_pm_opp_get_power(struct dev_pm_opp *opp)
+{
+	unsigned long opp_power = 0;
+	int i;
+
+	if (IS_ERR_OR_NULL(opp)) {
+		pr_err("%s: Invalid parameters\n", __func__);
+		return 0;
+	}
+	for (i = 0; i < opp->opp_table->regulator_count; i++)
+		opp_power += opp->supplies[i].u_watt;
+
+	return opp_power;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_get_power);
+
+/**
+ * dev_pm_opp_get_freq_indexed() - Gets the frequency corresponding to an
+ *				   available opp with specified index
+ * @opp: opp for which frequency has to be returned for
+ * @index: index of the frequency within the required opp
+ *
+ * Return: frequency in hertz corresponding to the opp with specified index,
+ * else return 0
+ */
+unsigned long dev_pm_opp_get_freq_indexed(struct dev_pm_opp *opp, u32 index)
+{
+	if (IS_ERR_OR_NULL(opp) || index >= opp->opp_table->clk_count) {
+		pr_err("%s: Invalid parameters\n", __func__);
+		return 0;
+	}
+
+	return opp->rates[index];
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq_indexed);
+
+/**
+ * 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\n", __func__);
+		return 0;
+	}
+
+	return opp->level;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_get_level);
+
+/**
+ * dev_pm_opp_get_required_pstate() - Gets the required performance state
+ *                                    corresponding to an available opp
+ * @opp:	opp for which performance state has to be returned for
+ * @index:	index of the required opp
+ *
+ * Return: performance state read from device tree corresponding to the
+ * required opp, else return 0.
+ */
+unsigned int dev_pm_opp_get_required_pstate(struct dev_pm_opp *opp,
+					    unsigned int index)
+{
+	if (IS_ERR_OR_NULL(opp) || !opp->available ||
+	    index >= opp->opp_table->required_opp_count) {
+		pr_err("%s: Invalid parameters\n", __func__);
+		return 0;
+	}
+
+	/* required-opps not fully initialized yet */
+	if (lazy_linking_pending(opp->opp_table))
+		return 0;
+
+	/* The required OPP table must belong to a genpd */
+	if (unlikely(!opp->opp_table->required_opp_tables[index]->is_genpd)) {
+		pr_err("%s: Performance state is only valid for genpds.\n", __func__);
+		return 0;
+	}
+
+	return opp->required_opps[index]->level;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_get_required_pstate);
+
+/**
+ * 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\n", __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)\n",
+			__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);
+
+/* Helpers to read keys */
+static unsigned long _read_freq(struct dev_pm_opp *opp, int index)
+{
+	return opp->rates[index];
+}
+
+static unsigned long _read_level(struct dev_pm_opp *opp, int index)
+{
+	return opp->level;
+}
+
+static unsigned long _read_bw(struct dev_pm_opp *opp, int index)
+{
+	return opp->bandwidth[index].peak;
+}
+
+/* Generic comparison helpers */
+static bool _compare_exact(struct dev_pm_opp **opp, struct dev_pm_opp *temp_opp,
+			   unsigned long opp_key, unsigned long key)
+{
+	if (opp_key == key) {
+		*opp = temp_opp;
+		return true;
+	}
+
+	return false;
+}
+
+static bool _compare_ceil(struct dev_pm_opp **opp, struct dev_pm_opp *temp_opp,
+			  unsigned long opp_key, unsigned long key)
+{
+	if (opp_key >= key) {
+		*opp = temp_opp;
+		return true;
+	}
+
+	return false;
+}
+
+static bool _compare_floor(struct dev_pm_opp **opp, struct dev_pm_opp *temp_opp,
+			   unsigned long opp_key, unsigned long key)
+{
+	if (opp_key > key)
+		return true;
+
+	*opp = temp_opp;
+	return false;
+}
+
+/* Generic key finding helpers */
+static struct dev_pm_opp *_opp_table_find_key(struct opp_table *opp_table,
+		unsigned long *key, int index, bool available,
+		unsigned long (*read)(struct dev_pm_opp *opp, int index),
+		bool (*compare)(struct dev_pm_opp **opp, struct dev_pm_opp *temp_opp,
+				unsigned long opp_key, unsigned long key),
+		bool (*assert)(struct opp_table *opp_table))
+{
+	struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
+
+	/* Assert that the requirement is met */
+	if (assert && !assert(opp_table))
+		return ERR_PTR(-EINVAL);
+
+	mutex_lock(&opp_table->lock);
+
+	list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
+		if (temp_opp->available == available) {
+			if (compare(&opp, temp_opp, read(temp_opp, index), *key))
+				break;
+		}
+	}
+
+	/* Increment the reference count of OPP */
+	if (!IS_ERR(opp)) {
+		*key = read(opp, index);
+		dev_pm_opp_get(opp);
+	}
+
+	mutex_unlock(&opp_table->lock);
+
+	return opp;
+}
+
+static struct dev_pm_opp *
+_find_key(struct device *dev, unsigned long *key, int index, bool available,
+	  unsigned long (*read)(struct dev_pm_opp *opp, int index),
+	  bool (*compare)(struct dev_pm_opp **opp, struct dev_pm_opp *temp_opp,
+			  unsigned long opp_key, unsigned long key),
+	  bool (*assert)(struct opp_table *opp_table))
+{
+	struct opp_table *opp_table;
+	struct dev_pm_opp *opp;
+
+	opp_table = _find_opp_table(dev);
+	if (IS_ERR(opp_table)) {
+		dev_err(dev, "%s: OPP table not found (%ld)\n", __func__,
+			PTR_ERR(opp_table));
+		return ERR_CAST(opp_table);
+	}
+
+	opp = _opp_table_find_key(opp_table, key, index, available, read,
+				  compare, assert);
+
+	dev_pm_opp_put_opp_table(opp_table);
+
+	return opp;
+}
+
+static struct dev_pm_opp *_find_key_exact(struct device *dev,
+		unsigned long key, int index, bool available,
+		unsigned long (*read)(struct dev_pm_opp *opp, int index),
+		bool (*assert)(struct opp_table *opp_table))
+{
+	/*
+	 * The value of key will be updated here, but will be ignored as the
+	 * caller doesn't need it.
+	 */
+	return _find_key(dev, &key, index, available, read, _compare_exact,
+			 assert);
+}
+
+static struct dev_pm_opp *_opp_table_find_key_ceil(struct opp_table *opp_table,
+		unsigned long *key, int index, bool available,
+		unsigned long (*read)(struct dev_pm_opp *opp, int index),
+		bool (*assert)(struct opp_table *opp_table))
+{
+	return _opp_table_find_key(opp_table, key, index, available, read,
+				   _compare_ceil, assert);
+}
+
+static struct dev_pm_opp *_find_key_ceil(struct device *dev, unsigned long *key,
+		int index, bool available,
+		unsigned long (*read)(struct dev_pm_opp *opp, int index),
+		bool (*assert)(struct opp_table *opp_table))
+{
+	return _find_key(dev, key, index, available, read, _compare_ceil,
+			 assert);
+}
+
+static struct dev_pm_opp *_find_key_floor(struct device *dev,
+		unsigned long *key, int index, bool available,
+		unsigned long (*read)(struct dev_pm_opp *opp, int index),
+		bool (*assert)(struct opp_table *opp_table))
+{
+	return _find_key(dev, key, index, available, read, _compare_floor,
+			 assert);
+}
+
+/**
+ * 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)
+{
+	return _find_key_exact(dev, freq, 0, available, _read_freq,
+			       assert_single_clk);
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact);
+
+/**
+ * dev_pm_opp_find_freq_exact_indexed() - Search for an exact freq for the
+ *					 clock corresponding to the index
+ * @dev:	Device for which we do this operation
+ * @freq:	frequency to search for
+ * @index:	Clock index
+ * @available:	true/false - match for available opp
+ *
+ * Search for the matching exact OPP for the clock corresponding to the
+ * specified index from a starting freq for a device.
+ *
+ * Return: matching *opp , 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_exact_indexed(struct device *dev, unsigned long freq,
+				   u32 index, bool available)
+{
+	return _find_key_exact(dev, freq, index, available, _read_freq, NULL);
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact_indexed);
+
+static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table,
+						   unsigned long *freq)
+{
+	return _opp_table_find_key_ceil(opp_table, freq, 0, true, _read_freq,
+					assert_single_clk);
+}
+
+/**
+ * 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)
+{
+	return _find_key_ceil(dev, freq, 0, true, _read_freq, assert_single_clk);
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil);
+
+/**
+ * dev_pm_opp_find_freq_ceil_indexed() - Search for a rounded ceil freq for the
+ *					 clock corresponding to the index
+ * @dev:	Device for which we do this operation
+ * @freq:	Start frequency
+ * @index:	Clock index
+ *
+ * Search for the matching ceil *available* OPP for the clock corresponding to
+ * the specified index 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_indexed(struct device *dev, unsigned long *freq,
+				  u32 index)
+{
+	return _find_key_ceil(dev, freq, index, true, _read_freq, NULL);
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil_indexed);
+
+/**
+ * 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)
+{
+	return _find_key_floor(dev, freq, 0, true, _read_freq, assert_single_clk);
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor);
+
+/**
+ * dev_pm_opp_find_freq_floor_indexed() - Search for a rounded floor freq for the
+ *					  clock corresponding to the index
+ * @dev:	Device for which we do this operation
+ * @freq:	Start frequency
+ * @index:	Clock index
+ *
+ * Search for the matching floor *available* OPP for the clock corresponding to
+ * the specified index 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_indexed(struct device *dev, unsigned long *freq,
+				   u32 index)
+{
+	return _find_key_floor(dev, freq, index, true, _read_freq, NULL);
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor_indexed);
+
+/**
+ * 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)
+{
+	return _find_key_exact(dev, level, 0, true, _read_level, NULL);
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_exact);
+
+/**
+ * dev_pm_opp_find_level_ceil() - search for an rounded up level
+ * @dev:		device for which we do this operation
+ * @level:		level to search for
+ *
+ * Return: Searches for rounded up 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_ceil(struct device *dev,
+					      unsigned int *level)
+{
+	unsigned long temp = *level;
+	struct dev_pm_opp *opp;
+
+	opp = _find_key_ceil(dev, &temp, 0, true, _read_level, NULL);
+	*level = temp;
+	return opp;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_ceil);
+
+/**
+ * dev_pm_opp_find_bw_ceil() - Search for a rounded ceil bandwidth
+ * @dev:	device for which we do this operation
+ * @bw:	start bandwidth
+ * @index:	which bandwidth to compare, in case of OPPs with several values
+ *
+ * Search for the matching floor *available* OPP from a starting bandwidth
+ * for a device.
+ *
+ * Return: matching *opp and refreshes *bw 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_bw_ceil(struct device *dev, unsigned int *bw,
+					   int index)
+{
+	unsigned long temp = *bw;
+	struct dev_pm_opp *opp;
+
+	opp = _find_key_ceil(dev, &temp, index, true, _read_bw, NULL);
+	*bw = temp;
+	return opp;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_find_bw_ceil);
+
+/**
+ * dev_pm_opp_find_bw_floor() - Search for a rounded floor bandwidth
+ * @dev:	device for which we do this operation
+ * @bw:	start bandwidth
+ * @index:	which bandwidth to compare, in case of OPPs with several values
+ *
+ * Search for the matching floor *available* OPP from a starting bandwidth
+ * for a device.
+ *
+ * Return: matching *opp and refreshes *bw 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_bw_floor(struct device *dev,
+					    unsigned int *bw, int index)
+{
+	unsigned long temp = *bw;
+	struct dev_pm_opp *opp;
+
+	opp = _find_key_floor(dev, &temp, index, true, _read_bw, NULL);
+	*bw = temp;
+	return opp;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_find_bw_floor);
+
+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\n", __func__,
+			PTR_ERR(reg));
+		return 0;
+	}
+
+	dev_dbg(dev, "%s: voltages (mV): %lu %lu %lu\n", __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\n",
+			__func__, supply->u_volt_min, supply->u_volt,
+			supply->u_volt_max, ret);
+
+	return ret;
+}
+
+static int
+_opp_config_clk_single(struct device *dev, struct opp_table *opp_table,
+		       struct dev_pm_opp *opp, void *data, bool scaling_down)
+{
+	unsigned long *target = data;
+	unsigned long freq;
+	int ret;
+
+	/* One of target and opp must be available */
+	if (target) {
+		freq = *target;
+	} else if (opp) {
+		freq = opp->rates[0];
+	} else {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+
+	ret = clk_set_rate(opp_table->clk, freq);
+	if (ret) {
+		dev_err(dev, "%s: failed to set clock rate: %d\n", __func__,
+			ret);
+	} else {
+		opp_table->rate_clk_single = freq;
+	}
+
+	return ret;
+}
+
+/*
+ * Simple implementation for configuring multiple clocks. Configure clocks in
+ * the order in which they are present in the array while scaling up.
+ */
+int dev_pm_opp_config_clks_simple(struct device *dev,
+		struct opp_table *opp_table, struct dev_pm_opp *opp, void *data,
+		bool scaling_down)
+{
+	int ret, i;
+
+	if (scaling_down) {
+		for (i = opp_table->clk_count - 1; i >= 0; i--) {
+			ret = clk_set_rate(opp_table->clks[i], opp->rates[i]);
+			if (ret) {
+				dev_err(dev, "%s: failed to set clock rate: %d\n", __func__,
+					ret);
+				return ret;
+			}
+		}
+	} else {
+		for (i = 0; i < opp_table->clk_count; i++) {
+			ret = clk_set_rate(opp_table->clks[i], opp->rates[i]);
+			if (ret) {
+				dev_err(dev, "%s: failed to set clock rate: %d\n", __func__,
+					ret);
+				return ret;
+			}
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_config_clks_simple);
+
+static int _opp_config_regulator_single(struct device *dev,
+			struct dev_pm_opp *old_opp, struct dev_pm_opp *new_opp,
+			struct regulator **regulators, unsigned int count)
+{
+	struct regulator *reg = regulators[0];
+	int ret;
+
+	/* This function only supports single regulator per device */
+	if (WARN_ON(count > 1)) {
+		dev_err(dev, "multiple regulators are not supported\n");
+		return -EINVAL;
+	}
+
+	ret = _set_opp_voltage(dev, reg, new_opp->supplies);
+	if (ret)
+		return ret;
+
+	/*
+	 * Enable the regulator after setting its voltages, otherwise it breaks
+	 * some boot-enabled regulators.
+	 */
+	if (unlikely(!new_opp->opp_table->enabled)) {
+		ret = regulator_enable(reg);
+		if (ret < 0)
+			dev_warn(dev, "Failed to enable regulator: %d", ret);
+	}
+
+	return 0;
+}
+
+static int _set_opp_bw(const struct opp_table *opp_table,
+		       struct dev_pm_opp *opp, struct device *dev)
+{
+	u32 avg, peak;
+	int i, ret;
+
+	if (!opp_table->paths)
+		return 0;
+
+	for (i = 0; i < opp_table->path_count; i++) {
+		if (!opp) {
+			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\n",
+				opp ? "set" : "remove", i, ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int _set_performance_state(struct device *dev, struct device *pd_dev,
+				  struct dev_pm_opp *opp, int i)
+{
+	unsigned int pstate = likely(opp) ? opp->required_opps[i]->level: 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 state of %s: %d (%d)\n",
+			dev_name(pd_dev), pstate, ret);
+	}
+
+	return ret;
+}
+
+static int _opp_set_required_opps_generic(struct device *dev,
+	struct opp_table *opp_table, struct dev_pm_opp *opp, bool scaling_down)
+{
+	dev_err(dev, "setting required-opps isn't supported for non-genpd devices\n");
+	return -ENOENT;
+}
+
+static int _opp_set_required_opps_genpd(struct device *dev,
+	struct opp_table *opp_table, struct dev_pm_opp *opp, bool scaling_down)
+{
+	struct device **genpd_virt_devs =
+		opp_table->genpd_virt_devs ? opp_table->genpd_virt_devs : &dev;
+	int i, ret = 0;
+
+	/*
+	 * 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 (!scaling_down) {
+		for (i = 0; i < opp_table->required_opp_count; i++) {
+			ret = _set_performance_state(dev, genpd_virt_devs[i], opp, i);
+			if (ret)
+				break;
+		}
+	} else {
+		for (i = opp_table->required_opp_count - 1; i >= 0; i--) {
+			ret = _set_performance_state(dev, genpd_virt_devs[i], opp, i);
+			if (ret)
+				break;
+		}
+	}
+
+	mutex_unlock(&opp_table->genpd_virt_dev_lock);
+
+	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)
+{
+	/* required-opps not fully initialized yet */
+	if (lazy_linking_pending(opp_table))
+		return -EBUSY;
+
+	if (opp_table->set_required_opps)
+		return opp_table->set_required_opps(dev, opp_table, opp, up);
+
+	return 0;
+}
+
+/* Update set_required_opps handler */
+void _update_set_required_opps(struct opp_table *opp_table)
+{
+	/* Already set */
+	if (opp_table->set_required_opps)
+		return;
+
+	/* All required OPPs will belong to genpd or none */
+	if (opp_table->required_opp_tables[0]->is_genpd)
+		opp_table->set_required_opps = _opp_set_required_opps_genpd;
+	else
+		opp_table->set_required_opps = _opp_set_required_opps_generic;
+}
+
+static void _find_current_opp(struct device *dev, struct opp_table *opp_table)
+{
+	struct dev_pm_opp *opp = ERR_PTR(-ENODEV);
+	unsigned long freq;
+
+	if (!IS_ERR(opp_table->clk)) {
+		freq = clk_get_rate(opp_table->clk);
+		opp = _find_freq_ceil(opp_table, &freq);
+	}
+
+	/*
+	 * Unable to find the current OPP ? Pick the first from the list since
+	 * it is in ascending order, otherwise rest of the code will need to
+	 * make special checks to validate current_opp.
+	 */
+	if (IS_ERR(opp)) {
+		mutex_lock(&opp_table->lock);
+		opp = list_first_entry(&opp_table->opp_list, struct dev_pm_opp, node);
+		dev_pm_opp_get(opp);
+		mutex_unlock(&opp_table->lock);
+	}
+
+	opp_table->current_opp = opp;
+}
+
+static int _disable_opp_table(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);
+	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;
+}
+
+static int _set_opp(struct device *dev, struct opp_table *opp_table,
+		    struct dev_pm_opp *opp, void *clk_data, bool forced)
+{
+	struct dev_pm_opp *old_opp;
+	int scaling_down, ret;
+
+	if (unlikely(!opp))
+		return _disable_opp_table(dev, opp_table);
+
+	/* Find the currently set OPP if we don't know already */
+	if (unlikely(!opp_table->current_opp))
+		_find_current_opp(dev, opp_table);
+
+	old_opp = opp_table->current_opp;
+
+	/* Return early if nothing to do */
+	if (!forced && old_opp == opp && opp_table->enabled) {
+		dev_dbg_ratelimited(dev, "%s: OPPs are same, nothing to do\n", __func__);
+		return 0;
+	}
+
+	dev_dbg(dev, "%s: switching OPP: Freq %lu -> %lu Hz, Level %u -> %u, Bw %u -> %u\n",
+		__func__, old_opp->rates[0], opp->rates[0], old_opp->level,
+		opp->level, old_opp->bandwidth ? old_opp->bandwidth[0].peak : 0,
+		opp->bandwidth ? opp->bandwidth[0].peak : 0);
+
+	scaling_down = _opp_compare_key(opp_table, old_opp, opp);
+	if (scaling_down == -1)
+		scaling_down = 0;
+
+	/* Scaling up? Configure required OPPs before frequency */
+	if (!scaling_down) {
+		ret = _set_required_opps(dev, opp_table, opp, true);
+		if (ret) {
+			dev_err(dev, "Failed to set required opps: %d\n", ret);
+			return ret;
+		}
+
+		ret = _set_opp_bw(opp_table, opp, dev);
+		if (ret) {
+			dev_err(dev, "Failed to set bw: %d\n", ret);
+			return ret;
+		}
+
+		if (opp_table->config_regulators) {
+			ret = opp_table->config_regulators(dev, old_opp, opp,
+							   opp_table->regulators,
+							   opp_table->regulator_count);
+			if (ret) {
+				dev_err(dev, "Failed to set regulator voltages: %d\n",
+					ret);
+				return ret;
+			}
+		}
+	}
+
+	if (opp_table->config_clks) {
+		ret = opp_table->config_clks(dev, opp_table, opp, clk_data, scaling_down);
+		if (ret)
+			return ret;
+	}
+
+	/* Scaling down? Configure required OPPs after frequency */
+	if (scaling_down) {
+		if (opp_table->config_regulators) {
+			ret = opp_table->config_regulators(dev, old_opp, opp,
+							   opp_table->regulators,
+							   opp_table->regulator_count);
+			if (ret) {
+				dev_err(dev, "Failed to set regulator voltages: %d\n",
+					ret);
+				return ret;
+			}
+		}
+
+		ret = _set_opp_bw(opp_table, opp, dev);
+		if (ret) {
+			dev_err(dev, "Failed to set bw: %d\n", ret);
+			return ret;
+		}
+
+		ret = _set_required_opps(dev, opp_table, opp, false);
+		if (ret) {
+			dev_err(dev, "Failed to set required opps: %d\n", ret);
+			return ret;
+		}
+	}
+
+	opp_table->enabled = true;
+	dev_pm_opp_put(old_opp);
+
+	/* Make sure current_opp doesn't get freed */
+	dev_pm_opp_get(opp);
+	opp_table->current_opp = opp;
+
+	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 = 0, temp_freq;
+	struct dev_pm_opp *opp = NULL;
+	bool forced = false;
+	int ret;
+
+	opp_table = _find_opp_table(dev);
+	if (IS_ERR(opp_table)) {
+		dev_err(dev, "%s: device's opp table doesn't exist\n", __func__);
+		return PTR_ERR(opp_table);
+	}
+
+	if (target_freq) {
+		/*
+		 * 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 = opp_table->config_clks(dev, opp_table, NULL,
+						     &target_freq, false);
+			goto put_opp_table;
+		}
+
+		freq = clk_round_rate(opp_table->clk, target_freq);
+		if ((long)freq <= 0)
+			freq = target_freq;
+
+		/*
+		 * The clock driver may support finer resolution of the
+		 * frequencies than the OPP table, don't update the frequency we
+		 * pass to clk_set_rate() here.
+		 */
+		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)\n",
+				__func__, freq, ret);
+			goto put_opp_table;
+		}
+
+		/*
+		 * An OPP entry specifies the highest frequency at which other
+		 * properties of the OPP entry apply. Even if the new OPP is
+		 * same as the old one, we may still reach here for a different
+		 * value of the frequency. In such a case, do not abort but
+		 * configure the hardware to the desired frequency forcefully.
+		 */
+		forced = opp_table->rate_clk_single != freq;
+	}
+
+	ret = _set_opp(dev, opp_table, opp, &freq, forced);
+
+	if (freq)
+		dev_pm_opp_put(opp);
+
+put_opp_table:
+	dev_pm_opp_put_opp_table(opp_table);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_set_rate);
+
+/**
+ * dev_pm_opp_set_opp() - Configure device for OPP
+ * @dev: device for which we do this operation
+ * @opp: OPP to set to
+ *
+ * This configures the device based on the properties of the OPP passed to this
+ * routine.
+ *
+ * Return: 0 on success, a negative error number otherwise.
+ */
+int dev_pm_opp_set_opp(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 doesn't exist\n", __func__);
+		return PTR_ERR(opp_table);
+	}
+
+	ret = _set_opp(dev, opp_table, opp, NULL, false);
+	dev_pm_opp_put_opp_table(opp_table);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_set_opp);
+
+/* 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);
+}
+
+struct opp_device *_add_opp_dev(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;
+
+	mutex_lock(&opp_table->lock);
+	list_add(&opp_dev->node, &opp_table->dev_list);
+	mutex_unlock(&opp_table->lock);
+
+	/* Create debugfs entries for the opp_table */
+	opp_debug_register(opp_dev, opp_table);
+
+	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);
+	INIT_LIST_HEAD(&opp_table->lazy);
+
+	opp_table->clk = ERR_PTR(-ENODEV);
+
+	/* 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 interconnect path(s) for the device */
+	ret = dev_pm_opp_of_find_icc_paths(dev, opp_table);
+	if (ret) {
+		if (ret == -EPROBE_DEFER)
+			goto remove_opp_dev;
+
+		dev_warn(dev, "%s: Error finding interconnect paths: %d\n",
+			 __func__, ret);
+	}
+
+	BLOCKING_INIT_NOTIFIER_HEAD(&opp_table->head);
+	INIT_LIST_HEAD(&opp_table->opp_list);
+	kref_init(&opp_table->kref);
+
+	return opp_table;
+
+remove_opp_dev:
+	_of_clear_opp_table(opp_table);
+	_remove_opp_dev(opp_dev, opp_table);
+	mutex_destroy(&opp_table->genpd_virt_dev_lock);
+	mutex_destroy(&opp_table->lock);
+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 *_update_opp_table_clk(struct device *dev,
+					       struct opp_table *opp_table,
+					       bool getclk)
+{
+	int ret;
+
+	/*
+	 * Return early if we don't need to get clk or we have already done it
+	 * earlier.
+	 */
+	if (!getclk || IS_ERR(opp_table) || !IS_ERR(opp_table->clk) ||
+	    opp_table->clks)
+		return opp_table;
+
+	/* Find clk for the device */
+	opp_table->clk = clk_get(dev, NULL);
+
+	ret = PTR_ERR_OR_ZERO(opp_table->clk);
+	if (!ret) {
+		opp_table->config_clks = _opp_config_clk_single;
+		opp_table->clk_count = 1;
+		return opp_table;
+	}
+
+	if (ret == -ENOENT) {
+		/*
+		 * There are few platforms which don't want the OPP core to
+		 * manage device's clock settings. In such cases neither the
+		 * platform provides the clks explicitly to us, nor the DT
+		 * contains a valid clk entry. The OPP nodes in DT may still
+		 * contain "opp-hz" property though, which we need to parse and
+		 * allow the platform to find an OPP based on freq later on.
+		 *
+		 * This is a simple solution to take care of such corner cases,
+		 * i.e. make the clk_count 1, which lets us allocate space for
+		 * frequency in opp->rates and also parse the entries in DT.
+		 */
+		opp_table->clk_count = 1;
+
+		dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__, ret);
+		return opp_table;
+	}
+
+	dev_pm_opp_put_opp_table(opp_table);
+	dev_err_probe(dev, ret, "Couldn't find clock\n");
+
+	return ERR_PTR(ret);
+}
+
+/*
+ * We need to make sure that the OPP table for a device doesn't get added twice,
+ * if this routine gets called in parallel with the same device pointer.
+ *
+ * The simplest way to enforce that is to perform everything (find existing
+ * table and if not found, create a new one) under the opp_table_lock, so only
+ * one creator gets access to the same. But that expands the critical section
+ * under the lock and may end up causing circular dependencies with frameworks
+ * like debugfs, interconnect or clock framework as they may be direct or
+ * indirect users of OPP core.
+ *
+ * And for that reason we have to go for a bit tricky implementation here, which
+ * uses the opp_tables_busy flag to indicate if another creator is in the middle
+ * of adding an OPP table and others should wait for it to finish.
+ */
+struct opp_table *_add_opp_table_indexed(struct device *dev, int index,
+					 bool getclk)
+{
+	struct opp_table *opp_table;
+
+again:
+	mutex_lock(&opp_table_lock);
+
+	opp_table = _find_opp_table_unlocked(dev);
+	if (!IS_ERR(opp_table))
+		goto unlock;
+
+	/*
+	 * The opp_tables list or an OPP table's dev_list is getting updated by
+	 * another user, wait for it to finish.
+	 */
+	if (unlikely(opp_tables_busy)) {
+		mutex_unlock(&opp_table_lock);
+		cpu_relax();
+		goto again;
+	}
+
+	opp_tables_busy = true;
+	opp_table = _managed_opp(dev, index);
+
+	/* Drop the lock to reduce the size of critical section */
+	mutex_unlock(&opp_table_lock);
+
+	if (opp_table) {
+		if (!_add_opp_dev(dev, opp_table)) {
+			dev_pm_opp_put_opp_table(opp_table);
+			opp_table = ERR_PTR(-ENOMEM);
+		}
+
+		mutex_lock(&opp_table_lock);
+	} else {
+		opp_table = _allocate_opp_table(dev, index);
+
+		mutex_lock(&opp_table_lock);
+		if (!IS_ERR(opp_table))
+			list_add(&opp_table->node, &opp_tables);
+	}
+
+	opp_tables_busy = false;
+
+unlock:
+	mutex_unlock(&opp_table_lock);
+
+	return _update_opp_table_clk(dev, opp_table, getclk);
+}
+
+static struct opp_table *_add_opp_table(struct device *dev, bool getclk)
+{
+	return _add_opp_table_indexed(dev, 0, getclk);
+}
+
+struct opp_table *dev_pm_opp_get_opp_table(struct device *dev)
+{
+	return _find_opp_table(dev);
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_table);
+
+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);
+
+	if (opp_table->current_opp)
+		dev_pm_opp_put(opp_table->current_opp);
+
+	_of_clear_opp_table(opp_table);
+
+	/* Release automatically acquired single 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)
+		_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 kref *kref)
+{
+	struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref);
+	struct opp_table *opp_table = opp->opp_table;
+
+	list_del(&opp->node);
+	mutex_unlock(&opp_table->lock);
+
+	/*
+	 * Notify the changes in the availability of the operable
+	 * frequency/voltage list.
+	 */
+	blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_REMOVE, opp);
+	_of_clear_opp(opp_table, opp);
+	opp_debug_remove_one(opp);
+	kfree(opp);
+}
+
+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, &opp->opp_table->lock);
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_put);
+
+/**
+ * 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 = NULL, *iter;
+	struct opp_table *opp_table;
+
+	opp_table = _find_opp_table(dev);
+	if (IS_ERR(opp_table))
+		return;
+
+	if (!assert_single_clk(opp_table))
+		goto put_table;
+
+	mutex_lock(&opp_table->lock);
+
+	list_for_each_entry(iter, &opp_table->opp_list, node) {
+		if (iter->rates[0] == freq) {
+			opp = iter;
+			break;
+		}
+	}
+
+	mutex_unlock(&opp_table->lock);
+
+	if (opp) {
+		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\n",
+			 __func__, freq);
+	}
+
+put_table:
+	/* Drop the reference taken by _find_opp_table() */
+	dev_pm_opp_put_opp_table(opp_table);
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_remove);
+
+static struct dev_pm_opp *_opp_get_next(struct opp_table *opp_table,
+					bool dynamic)
+{
+	struct dev_pm_opp *opp = NULL, *temp;
+
+	mutex_lock(&opp_table->lock);
+	list_for_each_entry(temp, &opp_table->opp_list, node) {
+		/*
+		 * Refcount must be dropped only once for each OPP by OPP core,
+		 * do that with help of "removed" flag.
+		 */
+		if (!temp->removed && dynamic == temp->dynamic) {
+			opp = temp;
+			break;
+		}
+	}
+
+	mutex_unlock(&opp_table->lock);
+	return opp;
+}
+
+/*
+ * Can't call dev_pm_opp_put() from under the lock as debugfs removal needs to
+ * happen lock less to avoid circular dependency issues. This routine must be
+ * called without the opp_table->lock held.
+ */
+static void _opp_remove_all(struct opp_table *opp_table, bool dynamic)
+{
+	struct dev_pm_opp *opp;
+
+	while ((opp = _opp_get_next(opp_table, dynamic))) {
+		opp->removed = true;
+		dev_pm_opp_put(opp);
+
+		/* Drop the references taken by dev_pm_opp_add() */
+		if (dynamic)
+			dev_pm_opp_put_opp_table(opp_table);
+	}
+}
+
+bool _opp_remove_all_static(struct opp_table *opp_table)
+{
+	mutex_lock(&opp_table->lock);
+
+	if (!opp_table->parsed_static_opps) {
+		mutex_unlock(&opp_table->lock);
+		return false;
+	}
+
+	if (--opp_table->parsed_static_opps) {
+		mutex_unlock(&opp_table->lock);
+		return true;
+	}
+
+	mutex_unlock(&opp_table->lock);
+
+	_opp_remove_all(opp_table, false);
+	return true;
+}
+
+/**
+ * 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;
+
+	opp_table = _find_opp_table(dev);
+	if (IS_ERR(opp_table))
+		return;
+
+	_opp_remove_all(opp_table, true);
+
+	/* 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 *opp_table)
+{
+	struct dev_pm_opp *opp;
+	int supply_count, supply_size, icc_size, clk_size;
+
+	/* Allocate space for at least one supply */
+	supply_count = opp_table->regulator_count > 0 ?
+			opp_table->regulator_count : 1;
+	supply_size = sizeof(*opp->supplies) * supply_count;
+	clk_size = sizeof(*opp->rates) * opp_table->clk_count;
+	icc_size = sizeof(*opp->bandwidth) * opp_table->path_count;
+
+	/* allocate new OPP node and supplies structures */
+	opp = kzalloc(sizeof(*opp) + supply_size + clk_size + icc_size, GFP_KERNEL);
+	if (!opp)
+		return NULL;
+
+	/* Put the supplies, bw and clock at the end of the OPP structure */
+	opp->supplies = (struct dev_pm_opp_supply *)(opp + 1);
+
+	opp->rates = (unsigned long *)(opp->supplies + supply_count);
+
+	if (icc_size)
+		opp->bandwidth = (struct dev_pm_opp_icc_bw *)(opp->rates + opp_table->clk_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\n",
+				__func__, opp->supplies[i].u_volt_min,
+				opp->supplies[i].u_volt_max);
+			return false;
+		}
+	}
+
+	return true;
+}
+
+static int _opp_compare_rate(struct opp_table *opp_table,
+			     struct dev_pm_opp *opp1, struct dev_pm_opp *opp2)
+{
+	int i;
+
+	for (i = 0; i < opp_table->clk_count; i++) {
+		if (opp1->rates[i] != opp2->rates[i])
+			return opp1->rates[i] < opp2->rates[i] ? -1 : 1;
+	}
+
+	/* Same rates for both OPPs */
+	return 0;
+}
+
+static int _opp_compare_bw(struct opp_table *opp_table, struct dev_pm_opp *opp1,
+			   struct dev_pm_opp *opp2)
+{
+	int i;
+
+	for (i = 0; i < opp_table->path_count; i++) {
+		if (opp1->bandwidth[i].peak != opp2->bandwidth[i].peak)
+			return opp1->bandwidth[i].peak < opp2->bandwidth[i].peak ? -1 : 1;
+	}
+
+	/* Same bw for both OPPs */
+	return 0;
+}
+
+/*
+ * Returns
+ * 0: opp1 == opp2
+ * 1: opp1 > opp2
+ * -1: opp1 < opp2
+ */
+int _opp_compare_key(struct opp_table *opp_table, struct dev_pm_opp *opp1,
+		     struct dev_pm_opp *opp2)
+{
+	int ret;
+
+	ret = _opp_compare_rate(opp_table, opp1, opp2);
+	if (ret)
+		return ret;
+
+	ret = _opp_compare_bw(opp_table, opp1, opp2);
+	if (ret)
+		return ret;
+
+	if (opp1->level != opp2->level)
+		return opp1->level < opp2->level ? -1 : 1;
+
+	/* Duplicate OPPs */
+	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(opp_table, 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\n",
+			 __func__, opp->rates[0], opp->supplies[0].u_volt,
+			 opp->available, new_opp->rates[0],
+			 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;
+}
+
+void _required_opps_available(struct dev_pm_opp *opp, int count)
+{
+	int i;
+
+	for (i = 0; i < count; i++) {
+		if (opp->required_opps[i]->available)
+			continue;
+
+		opp->available = false;
+		pr_warn("%s: OPP not supported by required OPP %pOF (%lu)\n",
+			 __func__, opp->required_opps[i]->np, opp->rates[0]);
+		return;
+	}
+}
+
+/*
+ * 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)
+{
+	struct list_head *head;
+	int ret;
+
+	mutex_lock(&opp_table->lock);
+	head = &opp_table->opp_list;
+
+	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)\n",
+			 __func__, new_opp->rates[0]);
+	}
+
+	/* required-opps not fully initialized yet */
+	if (lazy_linking_pending(opp_table))
+		return 0;
+
+	_required_opps_available(new_opp, opp_table->required_opp_count);
+
+	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;
+
+	if (!assert_single_clk(opp_table))
+		return -EINVAL;
+
+	new_opp = _opp_allocate(opp_table);
+	if (!new_opp)
+		return -ENOMEM;
+
+	/* populate the opp table */
+	new_opp->rates[0] = 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);
+	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;
+}
+
+/**
+ * _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.
+ */
+static int _opp_set_supported_hw(struct opp_table *opp_table,
+				 const u32 *versions, unsigned int count)
+{
+	/* Another CPU that shares the OPP table has set the property ? */
+	if (opp_table->supported_hw)
+		return 0;
+
+	opp_table->supported_hw = kmemdup(versions, count * sizeof(*versions),
+					GFP_KERNEL);
+	if (!opp_table->supported_hw)
+		return -ENOMEM;
+
+	opp_table->supported_hw_count = count;
+
+	return 0;
+}
+
+/**
+ * _opp_put_supported_hw() - Releases resources blocked for supported hw
+ * @opp_table: OPP table returned by _opp_set_supported_hw().
+ *
+ * This is required only for the V2 bindings, and is called for a matching
+ * _opp_set_supported_hw(). Until this is called, the opp_table structure
+ * will not be freed.
+ */
+static void _opp_put_supported_hw(struct opp_table *opp_table)
+{
+	if (opp_table->supported_hw) {
+		kfree(opp_table->supported_hw);
+		opp_table->supported_hw = NULL;
+		opp_table->supported_hw_count = 0;
+	}
+}
+
+/**
+ * _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.
+ */
+static int _opp_set_prop_name(struct opp_table *opp_table, const char *name)
+{
+	/* Another CPU that shares the OPP table has set the property ? */
+	if (!opp_table->prop_name) {
+		opp_table->prop_name = kstrdup(name, GFP_KERNEL);
+		if (!opp_table->prop_name)
+			return -ENOMEM;
+	}
+
+	return 0;
+}
+
+/**
+ * _opp_put_prop_name() - Releases resources blocked for prop-name
+ * @opp_table: OPP table returned by _opp_set_prop_name().
+ *
+ * This is required only for the V2 bindings, and is called for a matching
+ * _opp_set_prop_name(). Until this is called, the opp_table structure
+ * will not be freed.
+ */
+static void _opp_put_prop_name(struct opp_table *opp_table)
+{
+	if (opp_table->prop_name) {
+		kfree(opp_table->prop_name);
+		opp_table->prop_name = NULL;
+	}
+}
+
+/**
+ * _opp_set_regulators() - Set regulator names for the device
+ * @dev: Device for which regulator name is being set.
+ * @names: Array of pointers to the names of the regulator.
+ * @count: Number of regulators.
+ *
+ * In order to support OPP switching, OPP layer needs to know the name of the
+ * device's regulators, as the core would be required to switch voltages as
+ * well.
+ *
+ * This must be called before any OPPs are initialized for the device.
+ */
+static int _opp_set_regulators(struct opp_table *opp_table, struct device *dev,
+			       const char * const names[])
+{
+	const char * const *temp = names;
+	struct regulator *reg;
+	int count = 0, ret, i;
+
+	/* Count number of regulators */
+	while (*temp++)
+		count++;
+
+	if (!count)
+		return -EINVAL;
+
+	/* Another CPU that shares the OPP table has set the regulators ? */
+	if (opp_table->regulators)
+		return 0;
+
+	opp_table->regulators = kmalloc_array(count,
+					      sizeof(*opp_table->regulators),
+					      GFP_KERNEL);
+	if (!opp_table->regulators)
+		return -ENOMEM;
+
+	for (i = 0; i < count; i++) {
+		reg = regulator_get_optional(dev, names[i]);
+		if (IS_ERR(reg)) {
+			ret = dev_err_probe(dev, PTR_ERR(reg),
+					    "%s: no regulator (%s) found\n",
+					    __func__, names[i]);
+			goto free_regulators;
+		}
+
+		opp_table->regulators[i] = reg;
+	}
+
+	opp_table->regulator_count = count;
+
+	/* Set generic config_regulators() for single regulators here */
+	if (count == 1)
+		opp_table->config_regulators = _opp_config_regulator_single;
+
+	return 0;
+
+free_regulators:
+	while (i != 0)
+		regulator_put(opp_table->regulators[--i]);
+
+	kfree(opp_table->regulators);
+	opp_table->regulators = NULL;
+	opp_table->regulator_count = -1;
+
+	return ret;
+}
+
+/**
+ * _opp_put_regulators() - Releases resources blocked for regulator
+ * @opp_table: OPP table returned from _opp_set_regulators().
+ */
+static void _opp_put_regulators(struct opp_table *opp_table)
+{
+	int i;
+
+	if (!opp_table->regulators)
+		return;
+
+	if (opp_table->enabled) {
+		for (i = opp_table->regulator_count - 1; i >= 0; i--)
+			regulator_disable(opp_table->regulators[i]);
+	}
+
+	for (i = opp_table->regulator_count - 1; i >= 0; i--)
+		regulator_put(opp_table->regulators[i]);
+
+	kfree(opp_table->regulators);
+	opp_table->regulators = NULL;
+	opp_table->regulator_count = -1;
+}
+
+static void _put_clks(struct opp_table *opp_table, int count)
+{
+	int i;
+
+	for (i = count - 1; i >= 0; i--)
+		clk_put(opp_table->clks[i]);
+
+	kfree(opp_table->clks);
+	opp_table->clks = NULL;
+}
+
+/**
+ * _opp_set_clknames() - Set clk names for the device
+ * @dev: Device for which clk names is being set.
+ * @names: Clk names.
+ *
+ * In order to support OPP switching, OPP layer needs to get pointers to the
+ * clocks for the device. Simple cases work fine without using this routine
+ * (i.e. by passing connection-id as NULL), but for a device with multiple
+ * clocks available, the OPP core needs to know the exact names of the clks to
+ * use.
+ *
+ * This must be called before any OPPs are initialized for the device.
+ */
+static int _opp_set_clknames(struct opp_table *opp_table, struct device *dev,
+			     const char * const names[],
+			     config_clks_t config_clks)
+{
+	const char * const *temp = names;
+	int count = 0, ret, i;
+	struct clk *clk;
+
+	/* Count number of clks */
+	while (*temp++)
+		count++;
+
+	/*
+	 * This is a special case where we have a single clock, whose connection
+	 * id name is NULL, i.e. first two entries are NULL in the array.
+	 */
+	if (!count && !names[1])
+		count = 1;
+
+	/* Fail early for invalid configurations */
+	if (!count || (!config_clks && count > 1))
+		return -EINVAL;
+
+	/* Another CPU that shares the OPP table has set the clkname ? */
+	if (opp_table->clks)
+		return 0;
+
+	opp_table->clks = kmalloc_array(count, sizeof(*opp_table->clks),
+					GFP_KERNEL);
+	if (!opp_table->clks)
+		return -ENOMEM;
+
+	/* Find clks for the device */
+	for (i = 0; i < count; i++) {
+		clk = clk_get(dev, names[i]);
+		if (IS_ERR(clk)) {
+			ret = dev_err_probe(dev, PTR_ERR(clk),
+					    "%s: Couldn't find clock with name: %s\n",
+					    __func__, names[i]);
+			goto free_clks;
+		}
+
+		opp_table->clks[i] = clk;
+	}
+
+	opp_table->clk_count = count;
+	opp_table->config_clks = config_clks;
+
+	/* Set generic single clk set here */
+	if (count == 1) {
+		if (!opp_table->config_clks)
+			opp_table->config_clks = _opp_config_clk_single;
+
+		/*
+		 * We could have just dropped the "clk" field and used "clks"
+		 * everywhere. Instead we kept the "clk" field around for
+		 * following reasons:
+		 *
+		 * - avoiding clks[0] everywhere else.
+		 * - not running single clk helpers for multiple clk usecase by
+		 *   mistake.
+		 *
+		 * Since this is single-clk case, just update the clk pointer
+		 * too.
+		 */
+		opp_table->clk = opp_table->clks[0];
+	}
+
+	return 0;
+
+free_clks:
+	_put_clks(opp_table, i);
+	return ret;
+}
+
+/**
+ * _opp_put_clknames() - Releases resources blocked for clks.
+ * @opp_table: OPP table returned from _opp_set_clknames().
+ */
+static void _opp_put_clknames(struct opp_table *opp_table)
+{
+	if (!opp_table->clks)
+		return;
+
+	opp_table->config_clks = NULL;
+	opp_table->clk = ERR_PTR(-ENODEV);
+
+	_put_clks(opp_table, opp_table->clk_count);
+}
+
+/**
+ * _opp_set_config_regulators_helper() - Register custom set regulator helper.
+ * @dev: Device for which the helper is getting registered.
+ * @config_regulators: Custom set regulator helper.
+ *
+ * This is useful to support platforms with multiple regulators per device.
+ *
+ * This must be called before any OPPs are initialized for the device.
+ */
+static int _opp_set_config_regulators_helper(struct opp_table *opp_table,
+		struct device *dev, config_regulators_t config_regulators)
+{
+	/* Another CPU that shares the OPP table has set the helper ? */
+	if (!opp_table->config_regulators)
+		opp_table->config_regulators = config_regulators;
+
+	return 0;
+}
+
+/**
+ * _opp_put_config_regulators_helper() - Releases resources blocked for
+ *					 config_regulators helper.
+ * @opp_table: OPP table returned from _opp_set_config_regulators_helper().
+ *
+ * Release resources blocked for platform specific config_regulators helper.
+ */
+static void _opp_put_config_regulators_helper(struct opp_table *opp_table)
+{
+	if (opp_table->config_regulators)
+		opp_table->config_regulators = NULL;
+}
+
+static void _detach_genpd(struct opp_table *opp_table)
+{
+	int index;
+
+	if (!opp_table->genpd_virt_devs)
+		return;
+
+	for (index = 0; index < opp_table->required_opp_count; index++) {
+		if (!opp_table->genpd_virt_devs[index])
+			continue;
+
+		dev_pm_domain_detach(opp_table->genpd_virt_devs[index], false);
+		opp_table->genpd_virt_devs[index] = NULL;
+	}
+
+	kfree(opp_table->genpd_virt_devs);
+	opp_table->genpd_virt_devs = NULL;
+}
+
+/**
+ * _opp_attach_genpd - Attach genpd(s) for the device and save virtual device pointer
+ * @dev: Consumer device for which the genpd is getting attached.
+ * @names: Null terminated array of pointers containing names of genpd to attach.
+ * @virt_devs: Pointer to return the array of virtual devices.
+ *
+ * Multiple generic power domains for a device are supported with the help of
+ * virtual genpd devices, which are created for each consumer device - genpd
+ * pair. These are the device structures which are attached to the power domain
+ * and are required by the OPP core to set the performance state of the genpd.
+ * The same API also works for the case where single genpd is available and so
+ * we don't need to support that separately.
+ *
+ * This helper will normally be called by the consumer driver of the device
+ * "dev", as only that has details of the genpd names.
+ *
+ * This helper needs to be called once with a list of all genpd to attach.
+ * Otherwise the original device structure will be used instead by the OPP core.
+ *
+ * The order of entries in the names array must match the order in which
+ * "required-opps" are added in DT.
+ */
+static int _opp_attach_genpd(struct opp_table *opp_table, struct device *dev,
+			const char * const *names, struct device ***virt_devs)
+{
+	struct device *virt_dev;
+	int index = 0, ret = -EINVAL;
+	const char * const *name = names;
+
+	if (opp_table->genpd_virt_devs)
+		return 0;
+
+	/*
+	 * If the genpd's OPP table isn't already initialized, parsing of the
+	 * required-opps fail for dev. We should retry this after genpd's OPP
+	 * table is added.
+	 */
+	if (!opp_table->required_opp_count)
+		return -EPROBE_DEFER;
+
+	mutex_lock(&opp_table->genpd_virt_dev_lock);
+
+	opp_table->genpd_virt_devs = kcalloc(opp_table->required_opp_count,
+					     sizeof(*opp_table->genpd_virt_devs),
+					     GFP_KERNEL);
+	if (!opp_table->genpd_virt_devs)
+		goto unlock;
+
+	while (*name) {
+		if (index >= opp_table->required_opp_count) {
+			dev_err(dev, "Index can't be greater than required-opp-count - 1, %s (%d : %d)\n",
+				*name, opp_table->required_opp_count, index);
+			goto err;
+		}
+
+		virt_dev = dev_pm_domain_attach_by_name(dev, *name);
+		if (IS_ERR_OR_NULL(virt_dev)) {
+			ret = virt_dev ? PTR_ERR(virt_dev) : -ENODEV;
+			dev_err(dev, "Couldn't attach to pm_domain: %d\n", ret);
+			goto err;
+		}
+
+		opp_table->genpd_virt_devs[index] = virt_dev;
+		index++;
+		name++;
+	}
+
+	if (virt_devs)
+		*virt_devs = opp_table->genpd_virt_devs;
+	mutex_unlock(&opp_table->genpd_virt_dev_lock);
+
+	return 0;
+
+err:
+	_detach_genpd(opp_table);
+unlock:
+	mutex_unlock(&opp_table->genpd_virt_dev_lock);
+	return ret;
+
+}
+
+/**
+ * _opp_detach_genpd() - Detach genpd(s) from the device.
+ * @opp_table: OPP table returned by _opp_attach_genpd().
+ *
+ * This detaches the genpd(s), resets the virtual device pointers, and puts the
+ * OPP table.
+ */
+static void _opp_detach_genpd(struct opp_table *opp_table)
+{
+	/*
+	 * Acquire genpd_virt_dev_lock to make sure virt_dev isn't getting
+	 * used in parallel.
+	 */
+	mutex_lock(&opp_table->genpd_virt_dev_lock);
+	_detach_genpd(opp_table);
+	mutex_unlock(&opp_table->genpd_virt_dev_lock);
+}
+
+static void _opp_clear_config(struct opp_config_data *data)
+{
+	if (data->flags & OPP_CONFIG_GENPD)
+		_opp_detach_genpd(data->opp_table);
+	if (data->flags & OPP_CONFIG_REGULATOR)
+		_opp_put_regulators(data->opp_table);
+	if (data->flags & OPP_CONFIG_SUPPORTED_HW)
+		_opp_put_supported_hw(data->opp_table);
+	if (data->flags & OPP_CONFIG_REGULATOR_HELPER)
+		_opp_put_config_regulators_helper(data->opp_table);
+	if (data->flags & OPP_CONFIG_PROP_NAME)
+		_opp_put_prop_name(data->opp_table);
+	if (data->flags & OPP_CONFIG_CLK)
+		_opp_put_clknames(data->opp_table);
+
+	dev_pm_opp_put_opp_table(data->opp_table);
+	kfree(data);
+}
+
+/**
+ * dev_pm_opp_set_config() - Set OPP configuration for the device.
+ * @dev: Device for which configuration is being set.
+ * @config: OPP configuration.
+ *
+ * This allows all device OPP configurations to be performed at once.
+ *
+ * This must be called before any OPPs are initialized for the device. This may
+ * be called multiple times for the same OPP table, for example once for each
+ * CPU that share the same table. This must be balanced by the same number of
+ * calls to dev_pm_opp_clear_config() in order to free the OPP table properly.
+ *
+ * This returns a token to the caller, which must be passed to
+ * dev_pm_opp_clear_config() to free the resources later. The value of the
+ * returned token will be >= 1 for success and negative for errors. The minimum
+ * value of 1 is chosen here to make it easy for callers to manage the resource.
+ */
+int dev_pm_opp_set_config(struct device *dev, struct dev_pm_opp_config *config)
+{
+	struct opp_table *opp_table;
+	struct opp_config_data *data;
+	unsigned int id;
+	int ret;
+
+	data = kmalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	opp_table = _add_opp_table(dev, false);
+	if (IS_ERR(opp_table)) {
+		kfree(data);
+		return PTR_ERR(opp_table);
+	}
+
+	data->opp_table = opp_table;
+	data->flags = 0;
+
+	/* This should be called before OPPs are initialized */
+	if (WARN_ON(!list_empty(&opp_table->opp_list))) {
+		ret = -EBUSY;
+		goto err;
+	}
+
+	/* Configure clocks */
+	if (config->clk_names) {
+		ret = _opp_set_clknames(opp_table, dev, config->clk_names,
+					config->config_clks);
+		if (ret)
+			goto err;
+
+		data->flags |= OPP_CONFIG_CLK;
+	} else if (config->config_clks) {
+		/* Don't allow config callback without clocks */
+		ret = -EINVAL;
+		goto err;
+	}
+
+	/* Configure property names */
+	if (config->prop_name) {
+		ret = _opp_set_prop_name(opp_table, config->prop_name);
+		if (ret)
+			goto err;
+
+		data->flags |= OPP_CONFIG_PROP_NAME;
+	}
+
+	/* Configure config_regulators helper */
+	if (config->config_regulators) {
+		ret = _opp_set_config_regulators_helper(opp_table, dev,
+						config->config_regulators);
+		if (ret)
+			goto err;
+
+		data->flags |= OPP_CONFIG_REGULATOR_HELPER;
+	}
+
+	/* Configure supported hardware */
+	if (config->supported_hw) {
+		ret = _opp_set_supported_hw(opp_table, config->supported_hw,
+					    config->supported_hw_count);
+		if (ret)
+			goto err;
+
+		data->flags |= OPP_CONFIG_SUPPORTED_HW;
+	}
+
+	/* Configure supplies */
+	if (config->regulator_names) {
+		ret = _opp_set_regulators(opp_table, dev,
+					  config->regulator_names);
+		if (ret)
+			goto err;
+
+		data->flags |= OPP_CONFIG_REGULATOR;
+	}
+
+	/* Attach genpds */
+	if (config->genpd_names) {
+		ret = _opp_attach_genpd(opp_table, dev, config->genpd_names,
+					config->virt_devs);
+		if (ret)
+			goto err;
+
+		data->flags |= OPP_CONFIG_GENPD;
+	}
+
+	ret = xa_alloc(&opp_configs, &id, data, XA_LIMIT(1, INT_MAX),
+		       GFP_KERNEL);
+	if (ret)
+		goto err;
+
+	return id;
+
+err:
+	_opp_clear_config(data);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_set_config);
+
+/**
+ * dev_pm_opp_clear_config() - Releases resources blocked for OPP configuration.
+ * @opp_table: OPP table returned from dev_pm_opp_set_config().
+ *
+ * This allows all device OPP configurations to be cleared at once. This must be
+ * called once for each call made to dev_pm_opp_set_config(), in order to free
+ * the OPPs properly.
+ *
+ * Currently the first call itself ends up freeing all the OPP configurations,
+ * while the later ones only drop the OPP table reference. This works well for
+ * now as we would never want to use an half initialized OPP table and want to
+ * remove the configurations together.
+ */
+void dev_pm_opp_clear_config(int token)
+{
+	struct opp_config_data *data;
+
+	/*
+	 * This lets the callers call this unconditionally and keep their code
+	 * simple.
+	 */
+	if (unlikely(token <= 0))
+		return;
+
+	data = xa_erase(&opp_configs, token);
+	if (WARN_ON(!data))
+		return;
+
+	_opp_clear_config(data);
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_clear_config);
+
+static void devm_pm_opp_config_release(void *token)
+{
+	dev_pm_opp_clear_config((unsigned long)token);
+}
+
+/**
+ * devm_pm_opp_set_config() - Set OPP configuration for the device.
+ * @dev: Device for which configuration is being set.
+ * @config: OPP configuration.
+ *
+ * This allows all device OPP configurations to be performed at once.
+ * This is a resource-managed variant of dev_pm_opp_set_config().
+ *
+ * Return: 0 on success and errorno otherwise.
+ */
+int devm_pm_opp_set_config(struct device *dev, struct dev_pm_opp_config *config)
+{
+	int token = dev_pm_opp_set_config(dev, config);
+
+	if (token < 0)
+		return token;
+
+	return devm_add_action_or_reset(dev, devm_pm_opp_config_release,
+					(void *) ((unsigned long) token));
+}
+EXPORT_SYMBOL_GPL(devm_pm_opp_set_config);
+
+/**
+ * dev_pm_opp_xlate_required_opp() - Find required OPP for @src_table OPP.
+ * @src_table: OPP table which has @dst_table as one of its required OPP table.
+ * @dst_table: Required OPP table of the @src_table.
+ * @src_opp: OPP from the @src_table.
+ *
+ * This function returns the OPP (present in @dst_table) pointed out by the
+ * "required-opps" property of the @src_opp (present in @src_table).
+ *
+ * The callers are required to call dev_pm_opp_put() for the returned OPP after
+ * use.
+ *
+ * Return: pointer to 'struct dev_pm_opp' on success and errorno otherwise.
+ */
+struct dev_pm_opp *dev_pm_opp_xlate_required_opp(struct opp_table *src_table,
+						 struct opp_table *dst_table,
+						 struct dev_pm_opp *src_opp)
+{
+	struct dev_pm_opp *opp, *dest_opp = ERR_PTR(-ENODEV);
+	int i;
+
+	if (!src_table || !dst_table || !src_opp ||
+	    !src_table->required_opp_tables)
+		return ERR_PTR(-EINVAL);
+
+	/* required-opps not fully initialized yet */
+	if (lazy_linking_pending(src_table))
+		return ERR_PTR(-EBUSY);
+
+	for (i = 0; i < src_table->required_opp_count; i++) {
+		if (src_table->required_opp_tables[i] == dst_table) {
+			mutex_lock(&src_table->lock);
+
+			list_for_each_entry(opp, &src_table->opp_list, node) {
+				if (opp == src_opp) {
+					dest_opp = opp->required_opps[i];
+					dev_pm_opp_get(dest_opp);
+					break;
+				}
+			}
+
+			mutex_unlock(&src_table->lock);
+			break;
+		}
+	}
+
+	if (IS_ERR(dest_opp)) {
+		pr_err("%s: Couldn't find matching OPP (%p: %p)\n", __func__,
+		       src_table, dst_table);
+	}
+
+	return dest_opp;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_xlate_required_opp);
+
+/**
+ * dev_pm_opp_xlate_performance_state() - Find required OPP's pstate for src_table.
+ * @src_table: OPP table which has dst_table as one of its required OPP table.
+ * @dst_table: Required OPP table of the src_table.
+ * @pstate: Current performance state of the src_table.
+ *
+ * This Returns pstate of the OPP (present in @dst_table) pointed out by the
+ * "required-opps" property of the OPP (present in @src_table) which has
+ * performance state set to @pstate.
+ *
+ * Return: Zero or positive performance state on success, otherwise negative
+ * value on errors.
+ */
+int dev_pm_opp_xlate_performance_state(struct opp_table *src_table,
+				       struct opp_table *dst_table,
+				       unsigned int pstate)
+{
+	struct dev_pm_opp *opp;
+	int dest_pstate = -EINVAL;
+	int i;
+
+	/*
+	 * Normally the src_table will have the "required_opps" property set to
+	 * point to one of the OPPs in the dst_table, but in some cases the
+	 * genpd and its master have one to one mapping of performance states
+	 * and so none of them have the "required-opps" property set. Return the
+	 * pstate of the src_table as it is in such cases.
+	 */
+	if (!src_table || !src_table->required_opp_count)
+		return pstate;
+
+	/* Both OPP tables must belong to genpds */
+	if (unlikely(!src_table->is_genpd || !dst_table->is_genpd)) {
+		pr_err("%s: Performance state is only valid for genpds.\n", __func__);
+		return -EINVAL;
+	}
+
+	/* required-opps not fully initialized yet */
+	if (lazy_linking_pending(src_table))
+		return -EBUSY;
+
+	for (i = 0; i < src_table->required_opp_count; i++) {
+		if (src_table->required_opp_tables[i]->np == dst_table->np)
+			break;
+	}
+
+	if (unlikely(i == src_table->required_opp_count)) {
+		pr_err("%s: Couldn't find matching OPP table (%p: %p)\n",
+		       __func__, src_table, dst_table);
+		return -EINVAL;
+	}
+
+	mutex_lock(&src_table->lock);
+
+	list_for_each_entry(opp, &src_table->opp_list, node) {
+		if (opp->level == pstate) {
+			dest_pstate = opp->required_opps[i]->level;
+			goto unlock;
+		}
+	}
+
+	pr_err("%s: Couldn't find matching OPP (%p: %p)\n", __func__, src_table,
+	       dst_table);
+
+unlock:
+	mutex_unlock(&src_table->lock);
+
+	return dest_pstate;
+}
+
+/**
+ * dev_pm_opp_add()  - Add an OPP table from a table definitions
+ * @dev:	device for which we do this operation
+ * @freq:	Frequency in Hz for this OPP
+ * @u_volt:	Voltage in uVolts for this OPP
+ *
+ * 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.
+ *
+ * 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 dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt)
+{
+	struct opp_table *opp_table;
+	int ret;
+
+	opp_table = _add_opp_table(dev, true);
+	if (IS_ERR(opp_table))
+		return PTR_ERR(opp_table);
+
+	/* Fix regulator count for dynamic OPPs */
+	opp_table->regulator_count = 1;
+
+	ret = _opp_add_v1(opp_table, dev, freq, u_volt, true);
+	if (ret)
+		dev_pm_opp_put_opp_table(opp_table);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_add);
+
+/**
+ * _opp_set_availability() - helper to set the availability of an opp
+ * @dev:		device for which we do this operation
+ * @freq:		OPP frequency to modify availability
+ * @availability_req:	availability status requested for this opp
+ *
+ * Set the availability of an OPP, opp_{enable,disable} share a common logic
+ * which is isolated here.
+ *
+ * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
+ * copy operation, returns 0 if no modification was done OR modification was
+ * successful.
+ */
+static int _opp_set_availability(struct device *dev, unsigned long freq,
+				 bool availability_req)
+{
+	struct opp_table *opp_table;
+	struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV);
+	int r = 0;
+
+	/* Find the opp_table */
+	opp_table = _find_opp_table(dev);
+	if (IS_ERR(opp_table)) {
+		r = PTR_ERR(opp_table);
+		dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r);
+		return r;
+	}
+
+	if (!assert_single_clk(opp_table)) {
+		r = -EINVAL;
+		goto put_table;
+	}
+
+	mutex_lock(&opp_table->lock);
+
+	/* Do we have the frequency? */
+	list_for_each_entry(tmp_opp, &opp_table->opp_list, node) {
+		if (tmp_opp->rates[0] == freq) {
+			opp = tmp_opp;
+			break;
+		}
+	}
+
+	if (IS_ERR(opp)) {
+		r = PTR_ERR(opp);
+		goto unlock;
+	}
+
+	/* Is update really needed? */
+	if (opp->available == availability_req)
+		goto unlock;
+
+	opp->available = availability_req;
+
+	dev_pm_opp_get(opp);
+	mutex_unlock(&opp_table->lock);
+
+	/* Notify the change of the OPP availability */
+	if (availability_req)
+		blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ENABLE,
+					     opp);
+	else
+		blocking_notifier_call_chain(&opp_table->head,
+					     OPP_EVENT_DISABLE, opp);
+
+	dev_pm_opp_put(opp);
+	goto put_table;
+
+unlock:
+	mutex_unlock(&opp_table->lock);
+put_table:
+	dev_pm_opp_put_opp_table(opp_table);
+	return r;
+}
+
+/**
+ * dev_pm_opp_adjust_voltage() - helper to change the voltage of an OPP
+ * @dev:		device for which we do this operation
+ * @freq:		OPP frequency to adjust voltage of
+ * @u_volt:		new OPP target voltage
+ * @u_volt_min:		new OPP min voltage
+ * @u_volt_max:		new OPP max voltage
+ *
+ * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
+ * copy operation, returns 0 if no modifcation was done OR modification was
+ * successful.
+ */
+int dev_pm_opp_adjust_voltage(struct device *dev, unsigned long freq,
+			      unsigned long u_volt, unsigned long u_volt_min,
+			      unsigned long u_volt_max)
+
+{
+	struct opp_table *opp_table;
+	struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV);
+	int r = 0;
+
+	/* Find the opp_table */
+	opp_table = _find_opp_table(dev);
+	if (IS_ERR(opp_table)) {
+		r = PTR_ERR(opp_table);
+		dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r);
+		return r;
+	}
+
+	if (!assert_single_clk(opp_table)) {
+		r = -EINVAL;
+		goto put_table;
+	}
+
+	mutex_lock(&opp_table->lock);
+
+	/* Do we have the frequency? */
+	list_for_each_entry(tmp_opp, &opp_table->opp_list, node) {
+		if (tmp_opp->rates[0] == freq) {
+			opp = tmp_opp;
+			break;
+		}
+	}
+
+	if (IS_ERR(opp)) {
+		r = PTR_ERR(opp);
+		goto adjust_unlock;
+	}
+
+	/* Is update really needed? */
+	if (opp->supplies->u_volt == u_volt)
+		goto adjust_unlock;
+
+	opp->supplies->u_volt = u_volt;
+	opp->supplies->u_volt_min = u_volt_min;
+	opp->supplies->u_volt_max = u_volt_max;
+
+	dev_pm_opp_get(opp);
+	mutex_unlock(&opp_table->lock);
+
+	/* Notify the voltage change of the OPP */
+	blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADJUST_VOLTAGE,
+				     opp);
+
+	dev_pm_opp_put(opp);
+	goto put_table;
+
+adjust_unlock:
+	mutex_unlock(&opp_table->lock);
+put_table:
+	dev_pm_opp_put_opp_table(opp_table);
+	return r;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_adjust_voltage);
+
+/**
+ * dev_pm_opp_enable() - Enable a specific OPP
+ * @dev:	device for which we do this operation
+ * @freq:	OPP frequency to enable
+ *
+ * Enables a provided opp. If the operation is valid, this returns 0, else the
+ * corresponding error value. It is meant to be used for users an OPP available
+ * after being temporarily made unavailable with dev_pm_opp_disable.
+ *
+ * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
+ * copy operation, returns 0 if no modification was done OR modification was
+ * successful.
+ */
+int dev_pm_opp_enable(struct device *dev, unsigned long freq)
+{
+	return _opp_set_availability(dev, freq, true);
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_enable);
+
+/**
+ * dev_pm_opp_disable() - Disable a specific OPP
+ * @dev:	device for which we do this operation
+ * @freq:	OPP frequency to disable
+ *
+ * Disables a provided opp. If the operation is valid, this returns
+ * 0, else the corresponding error value. It is meant to be a temporary
+ * control by users to make this OPP not available until the circumstances are
+ * right to make it available again (with a call to dev_pm_opp_enable).
+ *
+ * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
+ * copy operation, returns 0 if no modification was done OR modification was
+ * successful.
+ */
+int dev_pm_opp_disable(struct device *dev, unsigned long freq)
+{
+	return _opp_set_availability(dev, freq, false);
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_disable);
+
+/**
+ * dev_pm_opp_register_notifier() - Register OPP notifier for the device
+ * @dev:	Device for which notifier needs to be registered
+ * @nb:		Notifier block to be registered
+ *
+ * Return: 0 on success or a negative error value.
+ */
+int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb)
+{
+	struct opp_table *opp_table;
+	int ret;
+
+	opp_table = _find_opp_table(dev);
+	if (IS_ERR(opp_table))
+		return PTR_ERR(opp_table);
+
+	ret = blocking_notifier_chain_register(&opp_table->head, nb);
+
+	dev_pm_opp_put_opp_table(opp_table);
+
+	return ret;
+}
+EXPORT_SYMBOL(dev_pm_opp_register_notifier);
+
+/**
+ * dev_pm_opp_unregister_notifier() - Unregister OPP notifier for the device
+ * @dev:	Device for which notifier needs to be unregistered
+ * @nb:		Notifier block to be unregistered
+ *
+ * Return: 0 on success or a negative error value.
+ */
+int dev_pm_opp_unregister_notifier(struct device *dev,
+				   struct notifier_block *nb)
+{
+	struct opp_table *opp_table;
+	int ret;
+
+	opp_table = _find_opp_table(dev);
+	if (IS_ERR(opp_table))
+		return PTR_ERR(opp_table);
+
+	ret = blocking_notifier_chain_unregister(&opp_table->head, nb);
+
+	dev_pm_opp_put_opp_table(opp_table);
+
+	return ret;
+}
+EXPORT_SYMBOL(dev_pm_opp_unregister_notifier);
+
+/**
+ * dev_pm_opp_remove_table() - Free all OPPs associated with the device
+ * @dev:	device pointer used to lookup OPP table.
+ *
+ * Free both OPPs created using static entries present in DT and the
+ * dynamically added entries.
+ */
+void dev_pm_opp_remove_table(struct device *dev)
+{
+	struct opp_table *opp_table;
+
+	/* Check for existing table for 'dev' */
+	opp_table = _find_opp_table(dev);
+	if (IS_ERR(opp_table)) {
+		int error = PTR_ERR(opp_table);
+
+		if (error != -ENODEV)
+			WARN(1, "%s: opp_table: %d\n",
+			     IS_ERR_OR_NULL(dev) ?
+					"Invalid device" : dev_name(dev),
+			     error);
+		return;
+	}
+
+	/*
+	 * Drop the extra reference only if the OPP table was successfully added
+	 * with dev_pm_opp_of_add_table() earlier.
+	 **/
+	if (_opp_remove_all_static(opp_table))
+		dev_pm_opp_put_opp_table(opp_table);
+
+	/* Drop reference taken by _find_opp_table() */
+	dev_pm_opp_put_opp_table(opp_table);
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table);
+
+/**
+ * dev_pm_opp_sync_regulators() - Sync state of voltage regulators
+ * @dev:	device for which we do this operation
+ *
+ * Sync voltage state of the OPP table regulators.
+ *
+ * Return: 0 on success or a negative error value.
+ */
+int dev_pm_opp_sync_regulators(struct device *dev)
+{
+	struct opp_table *opp_table;
+	struct regulator *reg;
+	int i, ret = 0;
+
+	/* Device may not have OPP table */
+	opp_table = _find_opp_table(dev);
+	if (IS_ERR(opp_table))
+		return 0;
+
+	/* Regulator may not be required for the device */
+	if (unlikely(!opp_table->regulators))
+		goto put_table;
+
+	/* Nothing to sync if voltage wasn't changed */
+	if (!opp_table->enabled)
+		goto put_table;
+
+	for (i = 0; i < opp_table->regulator_count; i++) {
+		reg = opp_table->regulators[i];
+		ret = regulator_sync_voltage(reg);
+		if (ret)
+			break;
+	}
+put_table:
+	/* Drop reference taken by _find_opp_table() */
+	dev_pm_opp_put_opp_table(opp_table);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_sync_regulators);
diff --git a/drivers/opp/cpu.c b/drivers/opp/cpu.c
new file mode 100644
index 0000000000..12c429b407
--- /dev/null
+++ b/drivers/opp/cpu.c
@@ -0,0 +1,236 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Generic OPP helper interface for CPU device
+ *
+ * Copyright (C) 2009-2014 Texas Instruments Incorporated.
+ *	Nishanth Menon
+ *	Romit Dasgupta
+ *	Kevin Hilman
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/cpu.h>
+#include <linux/cpufreq.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/export.h>
+#include <linux/slab.h>
+
+#include "opp.h"
+
+#ifdef CONFIG_CPU_FREQ
+
+/**
+ * dev_pm_opp_init_cpufreq_table() - create a cpufreq table for a device
+ * @dev:	device for which we do this operation
+ * @opp_table:	Cpufreq table returned back to caller
+ *
+ * Generate a cpufreq table for a provided device- this assumes that the
+ * opp table is already initialized and ready for usage.
+ *
+ * This function allocates required memory for the cpufreq table. It is
+ * expected that the caller does the required maintenance such as freeing
+ * the table as required.
+ *
+ * Returns -EINVAL for bad pointers, -ENODEV if the device is not found, -ENOMEM
+ * if no memory available for the operation (table is not populated), returns 0
+ * if successful and table is populated.
+ *
+ * WARNING: It is  important for the callers to ensure refreshing their copy of
+ * the table if any of the mentioned functions have been invoked in the interim.
+ */
+int dev_pm_opp_init_cpufreq_table(struct device *dev,
+				  struct cpufreq_frequency_table **opp_table)
+{
+	struct dev_pm_opp *opp;
+	struct cpufreq_frequency_table *freq_table = NULL;
+	int i, max_opps, ret = 0;
+	unsigned long rate;
+
+	max_opps = dev_pm_opp_get_opp_count(dev);
+	if (max_opps <= 0)
+		return max_opps ? max_opps : -ENODATA;
+
+	freq_table = kcalloc((max_opps + 1), sizeof(*freq_table), GFP_KERNEL);
+	if (!freq_table)
+		return -ENOMEM;
+
+	for (i = 0, rate = 0; i < max_opps; i++, rate++) {
+		/* find next rate */
+		opp = dev_pm_opp_find_freq_ceil(dev, &rate);
+		if (IS_ERR(opp)) {
+			ret = PTR_ERR(opp);
+			goto out;
+		}
+		freq_table[i].driver_data = i;
+		freq_table[i].frequency = rate / 1000;
+
+		/* Is Boost/turbo opp ? */
+		if (dev_pm_opp_is_turbo(opp))
+			freq_table[i].flags = CPUFREQ_BOOST_FREQ;
+
+		dev_pm_opp_put(opp);
+	}
+
+	freq_table[i].driver_data = i;
+	freq_table[i].frequency = CPUFREQ_TABLE_END;
+
+	*opp_table = &freq_table[0];
+
+out:
+	if (ret)
+		kfree(freq_table);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_init_cpufreq_table);
+
+/**
+ * dev_pm_opp_free_cpufreq_table() - free the cpufreq table
+ * @dev:	device for which we do this operation
+ * @opp_table:	table to free
+ *
+ * Free up the table allocated by dev_pm_opp_init_cpufreq_table
+ */
+void dev_pm_opp_free_cpufreq_table(struct device *dev,
+				   struct cpufreq_frequency_table **opp_table)
+{
+	if (!opp_table)
+		return;
+
+	kfree(*opp_table);
+	*opp_table = NULL;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_free_cpufreq_table);
+#endif	/* CONFIG_CPU_FREQ */
+
+void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask,
+				      int last_cpu)
+{
+	struct device *cpu_dev;
+	int cpu;
+
+	WARN_ON(cpumask_empty(cpumask));
+
+	for_each_cpu(cpu, cpumask) {
+		if (cpu == last_cpu)
+			break;
+
+		cpu_dev = get_cpu_device(cpu);
+		if (!cpu_dev) {
+			pr_err("%s: failed to get cpu%d device\n", __func__,
+			       cpu);
+			continue;
+		}
+
+		dev_pm_opp_remove_table(cpu_dev);
+	}
+}
+
+/**
+ * dev_pm_opp_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 to remove all the OPPs entries associated with
+ * the cpus in @cpumask.
+ */
+void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask)
+{
+	_dev_pm_opp_cpumask_remove_table(cpumask, -1);
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_cpumask_remove_table);
+
+/**
+ * dev_pm_opp_set_sharing_cpus() - Mark OPP table as shared by few CPUs
+ * @cpu_dev:	CPU device for which we do this operation
+ * @cpumask:	cpumask of the CPUs which share the OPP table with @cpu_dev
+ *
+ * This marks OPP table of the @cpu_dev as shared by the CPUs present in
+ * @cpumask.
+ *
+ * Returns -ENODEV if OPP table isn't already present.
+ */
+int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev,
+				const struct cpumask *cpumask)
+{
+	struct opp_device *opp_dev;
+	struct opp_table *opp_table;
+	struct device *dev;
+	int cpu, ret = 0;
+
+	opp_table = _find_opp_table(cpu_dev);
+	if (IS_ERR(opp_table))
+		return PTR_ERR(opp_table);
+
+	for_each_cpu(cpu, cpumask) {
+		if (cpu == cpu_dev->id)
+			continue;
+
+		dev = get_cpu_device(cpu);
+		if (!dev) {
+			dev_err(cpu_dev, "%s: failed to get cpu%d device\n",
+				__func__, cpu);
+			continue;
+		}
+
+		opp_dev = _add_opp_dev(dev, opp_table);
+		if (!opp_dev) {
+			dev_err(dev, "%s: failed to add opp-dev for cpu%d device\n",
+				__func__, cpu);
+			continue;
+		}
+
+		/* Mark opp-table as multiple CPUs are sharing it now */
+		opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED;
+	}
+
+	dev_pm_opp_put_opp_table(opp_table);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_set_sharing_cpus);
+
+/**
+ * dev_pm_opp_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with @cpu_dev
+ * @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 -ENODEV if OPP table isn't already present and -EINVAL if the OPP
+ * table's status is access-unknown.
+ */
+int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
+{
+	struct opp_device *opp_dev;
+	struct opp_table *opp_table;
+	int ret = 0;
+
+	opp_table = _find_opp_table(cpu_dev);
+	if (IS_ERR(opp_table))
+		return PTR_ERR(opp_table);
+
+	if (opp_table->shared_opp == OPP_TABLE_ACCESS_UNKNOWN) {
+		ret = -EINVAL;
+		goto put_opp_table;
+	}
+
+	cpumask_clear(cpumask);
+
+	if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) {
+		mutex_lock(&opp_table->lock);
+		list_for_each_entry(opp_dev, &opp_table->dev_list, node)
+			cpumask_set_cpu(opp_dev->dev->id, cpumask);
+		mutex_unlock(&opp_table->lock);
+	} else {
+		cpumask_set_cpu(cpu_dev->id, cpumask);
+	}
+
+put_opp_table:
+	dev_pm_opp_put_opp_table(opp_table);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_get_sharing_cpus);
diff --git a/drivers/opp/debugfs.c b/drivers/opp/debugfs.c
new file mode 100644
index 0000000000..17543c0aa5
--- /dev/null
+++ b/drivers/opp/debugfs.c
@@ -0,0 +1,279 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Generic OPP debugfs interface
+ *
+ * Copyright (C) 2015-2016 Viresh Kumar <viresh.kumar@linaro.org>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/debugfs.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/init.h>
+#include <linux/limits.h>
+#include <linux/slab.h>
+
+#include "opp.h"
+
+static struct dentry *rootdir;
+
+static void opp_set_dev_name(const struct device *dev, char *name)
+{
+	if (dev->parent)
+		snprintf(name, NAME_MAX, "%s-%s", dev_name(dev->parent),
+			 dev_name(dev));
+	else
+		snprintf(name, NAME_MAX, "%s", dev_name(dev));
+}
+
+void opp_debug_remove_one(struct dev_pm_opp *opp)
+{
+	debugfs_remove_recursive(opp->dentry);
+}
+
+static ssize_t bw_name_read(struct file *fp, char __user *userbuf,
+			    size_t count, loff_t *ppos)
+{
+	struct icc_path *path = fp->private_data;
+	char buf[64];
+	int i;
+
+	i = scnprintf(buf, sizeof(buf), "%.62s\n", icc_get_name(path));
+
+	return simple_read_from_buffer(userbuf, count, ppos, buf, i);
+}
+
+static const struct file_operations bw_name_fops = {
+	.open = simple_open,
+	.read = bw_name_read,
+	.llseek = default_llseek,
+};
+
+static void opp_debug_create_bw(struct dev_pm_opp *opp,
+				struct opp_table *opp_table,
+				struct dentry *pdentry)
+{
+	struct dentry *d;
+	char name[11];
+	int i;
+
+	for (i = 0; i < opp_table->path_count; i++) {
+		snprintf(name, sizeof(name), "icc-path-%.1d", i);
+
+		/* Create per-path directory */
+		d = debugfs_create_dir(name, pdentry);
+
+		debugfs_create_file("name", S_IRUGO, d, opp_table->paths[i],
+				    &bw_name_fops);
+		debugfs_create_u32("peak_bw", S_IRUGO, d,
+				   &opp->bandwidth[i].peak);
+		debugfs_create_u32("avg_bw", S_IRUGO, d,
+				   &opp->bandwidth[i].avg);
+	}
+}
+
+static void opp_debug_create_clks(struct dev_pm_opp *opp,
+				  struct opp_table *opp_table,
+				  struct dentry *pdentry)
+{
+	char name[12];
+	int i;
+
+	if (opp_table->clk_count == 1) {
+		debugfs_create_ulong("rate_hz", S_IRUGO, pdentry, &opp->rates[0]);
+		return;
+	}
+
+	for (i = 0; i < opp_table->clk_count; i++) {
+		snprintf(name, sizeof(name), "rate_hz_%d", i);
+		debugfs_create_ulong(name, S_IRUGO, pdentry, &opp->rates[i]);
+	}
+}
+
+static void opp_debug_create_supplies(struct dev_pm_opp *opp,
+				      struct opp_table *opp_table,
+				      struct dentry *pdentry)
+{
+	struct dentry *d;
+	int i;
+
+	for (i = 0; i < opp_table->regulator_count; i++) {
+		char name[15];
+
+		snprintf(name, sizeof(name), "supply-%d", i);
+
+		/* Create per-opp directory */
+		d = debugfs_create_dir(name, pdentry);
+
+		debugfs_create_ulong("u_volt_target", S_IRUGO, d,
+				     &opp->supplies[i].u_volt);
+
+		debugfs_create_ulong("u_volt_min", S_IRUGO, d,
+				     &opp->supplies[i].u_volt_min);
+
+		debugfs_create_ulong("u_volt_max", S_IRUGO, d,
+				     &opp->supplies[i].u_volt_max);
+
+		debugfs_create_ulong("u_amp", S_IRUGO, d,
+				     &opp->supplies[i].u_amp);
+
+		debugfs_create_ulong("u_watt", S_IRUGO, d,
+				     &opp->supplies[i].u_watt);
+	}
+}
+
+void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table)
+{
+	struct dentry *pdentry = opp_table->dentry;
+	struct dentry *d;
+	unsigned long id;
+	char name[25];	/* 20 chars for 64 bit value + 5 (opp:\0) */
+
+	/*
+	 * Get directory name for OPP.
+	 *
+	 * - Normally rate is unique to each OPP, use it to get unique opp-name.
+	 * - For some devices rate isn't available or there are multiple, use
+	 *   index instead for them.
+	 */
+	if (likely(opp_table->clk_count == 1 && opp->rates[0]))
+		id = opp->rates[0];
+	else
+		id = _get_opp_count(opp_table);
+
+	snprintf(name, sizeof(name), "opp:%lu", id);
+
+	/* Create per-opp directory */
+	d = debugfs_create_dir(name, pdentry);
+
+	debugfs_create_bool("available", S_IRUGO, d, &opp->available);
+	debugfs_create_bool("dynamic", S_IRUGO, d, &opp->dynamic);
+	debugfs_create_bool("turbo", S_IRUGO, d, &opp->turbo);
+	debugfs_create_bool("suspend", S_IRUGO, d, &opp->suspend);
+	debugfs_create_u32("level", S_IRUGO, d, &opp->level);
+	debugfs_create_ulong("clock_latency_ns", S_IRUGO, d,
+			     &opp->clock_latency_ns);
+
+	opp->of_name = of_node_full_name(opp->np);
+	debugfs_create_str("of_name", S_IRUGO, d, (char **)&opp->of_name);
+
+	opp_debug_create_clks(opp, opp_table, d);
+	opp_debug_create_supplies(opp, opp_table, d);
+	opp_debug_create_bw(opp, opp_table, d);
+
+	opp->dentry = d;
+}
+
+static void opp_list_debug_create_dir(struct opp_device *opp_dev,
+				      struct opp_table *opp_table)
+{
+	const struct device *dev = opp_dev->dev;
+	struct dentry *d;
+
+	opp_set_dev_name(dev, opp_table->dentry_name);
+
+	/* Create device specific directory */
+	d = debugfs_create_dir(opp_table->dentry_name, rootdir);
+
+	opp_dev->dentry = d;
+	opp_table->dentry = d;
+}
+
+static void opp_list_debug_create_link(struct opp_device *opp_dev,
+				       struct opp_table *opp_table)
+{
+	char name[NAME_MAX];
+
+	opp_set_dev_name(opp_dev->dev, name);
+
+	/* Create device specific directory link */
+	opp_dev->dentry = debugfs_create_symlink(name, rootdir,
+						 opp_table->dentry_name);
+}
+
+/**
+ * opp_debug_register - add a device opp node to the debugfs 'opp' directory
+ * @opp_dev: opp-dev pointer for device
+ * @opp_table: the device-opp being added
+ *
+ * Dynamically adds device specific directory in debugfs 'opp' directory. If the
+ * device-opp is shared with other devices, then links will be created for all
+ * devices except the first.
+ */
+void opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table)
+{
+	if (opp_table->dentry)
+		opp_list_debug_create_link(opp_dev, opp_table);
+	else
+		opp_list_debug_create_dir(opp_dev, opp_table);
+}
+
+static void opp_migrate_dentry(struct opp_device *opp_dev,
+			       struct opp_table *opp_table)
+{
+	struct opp_device *new_dev = NULL, *iter;
+	const struct device *dev;
+	struct dentry *dentry;
+
+	/* Look for next opp-dev */
+	list_for_each_entry(iter, &opp_table->dev_list, node)
+		if (iter != opp_dev) {
+			new_dev = iter;
+			break;
+		}
+
+	BUG_ON(!new_dev);
+
+	/* new_dev is guaranteed to be valid here */
+	dev = new_dev->dev;
+	debugfs_remove_recursive(new_dev->dentry);
+
+	opp_set_dev_name(dev, opp_table->dentry_name);
+
+	dentry = debugfs_rename(rootdir, opp_dev->dentry, rootdir,
+				opp_table->dentry_name);
+	if (IS_ERR(dentry)) {
+		dev_err(dev, "%s: Failed to rename link from: %s to %s\n",
+			__func__, dev_name(opp_dev->dev), dev_name(dev));
+		return;
+	}
+
+	new_dev->dentry = dentry;
+	opp_table->dentry = dentry;
+}
+
+/**
+ * opp_debug_unregister - remove a device opp node from debugfs opp directory
+ * @opp_dev: opp-dev pointer for device
+ * @opp_table: the device-opp being removed
+ *
+ * Dynamically removes device specific directory from debugfs 'opp' directory.
+ */
+void opp_debug_unregister(struct opp_device *opp_dev,
+			  struct opp_table *opp_table)
+{
+	if (opp_dev->dentry == opp_table->dentry) {
+		/* Move the real dentry object under another device */
+		if (!list_is_singular(&opp_table->dev_list)) {
+			opp_migrate_dentry(opp_dev, opp_table);
+			goto out;
+		}
+		opp_table->dentry = NULL;
+	}
+
+	debugfs_remove_recursive(opp_dev->dentry);
+
+out:
+	opp_dev->dentry = NULL;
+}
+
+static int __init opp_debug_init(void)
+{
+	/* Create /sys/kernel/debug/opp directory */
+	rootdir = debugfs_create_dir("opp", NULL);
+
+	return 0;
+}
+core_initcall(opp_debug_init);
diff --git a/drivers/opp/of.c b/drivers/opp/of.c
new file mode 100644
index 0000000000..ada4963c7c
--- /dev/null
+++ b/drivers/opp/of.c
@@ -0,0 +1,1598 @@
+// 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.h>
+#include <linux/pm_domain.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+#include <linux/energy_model.h>
+
+#include "opp.h"
+
+/* OPP tables with uninitialized required OPPs, protected by opp_table_lock */
+static LIST_HEAD(lazy_opp_tables);
+
+/*
+ * 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;
+
+	mutex_lock(&opp_table_lock);
+	list_del(&opp_table->lazy);
+	mutex_unlock(&opp_table_lock);
+}
+
+/*
+ * 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) {
+		/*
+		 * The OPP table is not held while allocating the table, take it
+		 * now to avoid corruption to the lazy_opp_tables list.
+		 */
+		mutex_lock(&opp_table_lock);
+		list_add(&opp_table->lazy, &lazy_opp_tables);
+		mutex_unlock(&opp_table_lock);
+	}
+	else
+		_update_set_required_opps(opp_table);
+
+	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_property_present(np, "#power-domain-cells"))
+		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) {
+			_update_set_required_opps(opp_table);
+			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 = dev_err_probe(dev, PTR_ERR(paths[i]), "%s: Unable to get path%d\n", __func__, i);
+			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_property_present(np, "opp-supported-hw"))
+			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 u32 *_parse_named_prop(struct dev_pm_opp *opp, struct device *dev,
+			      struct opp_table *opp_table,
+			      const char *prop_type, bool *triplet)
+{
+	struct property *prop = NULL;
+	char name[NAME_MAX];
+	int count, ret;
+	u32 *out;
+
+	/* Search for "opp-<prop_type>-<name>" */
+	if (opp_table->prop_name) {
+		snprintf(name, sizeof(name), "opp-%s-%s", prop_type,
+			 opp_table->prop_name);
+		prop = of_find_property(opp->np, name, NULL);
+	}
+
+	if (!prop) {
+		/* Search for "opp-<prop_type>" */
+		snprintf(name, sizeof(name), "opp-%s", prop_type);
+		prop = of_find_property(opp->np, name, NULL);
+		if (!prop)
+			return NULL;
+	}
+
+	count = of_property_count_u32_elems(opp->np, name);
+	if (count < 0) {
+		dev_err(dev, "%s: Invalid %s property (%d)\n", __func__, name,
+			count);
+		return ERR_PTR(count);
+	}
+
+	/*
+	 * Initialize regulator_count, if regulator information isn't provided
+	 * by the platform. Now that one of the properties is available, fix the
+	 * regulator_count to 1.
+	 */
+	if (unlikely(opp_table->regulator_count == -1))
+		opp_table->regulator_count = 1;
+
+	if (count != opp_table->regulator_count &&
+	    (!triplet || count != opp_table->regulator_count * 3)) {
+		dev_err(dev, "%s: Invalid number of elements in %s property (%u) with supplies (%d)\n",
+			__func__, prop_type, count, opp_table->regulator_count);
+		return ERR_PTR(-EINVAL);
+	}
+
+	out = kmalloc_array(count, sizeof(*out), GFP_KERNEL);
+	if (!out)
+		return ERR_PTR(-EINVAL);
+
+	ret = of_property_read_u32_array(opp->np, name, out, count);
+	if (ret) {
+		dev_err(dev, "%s: error parsing %s: %d\n", __func__, name, ret);
+		kfree(out);
+		return ERR_PTR(-EINVAL);
+	}
+
+	if (triplet)
+		*triplet = count != opp_table->regulator_count;
+
+	return out;
+}
+
+static u32 *opp_parse_microvolt(struct dev_pm_opp *opp, struct device *dev,
+				struct opp_table *opp_table, bool *triplet)
+{
+	u32 *microvolt;
+
+	microvolt = _parse_named_prop(opp, dev, opp_table, "microvolt", triplet);
+	if (IS_ERR(microvolt))
+		return microvolt;
+
+	if (!microvolt) {
+		/*
+		 * Missing property isn't a problem, but an invalid
+		 * entry is. This property isn't optional if regulator
+		 * information is provided. Check only for the first OPP, as
+		 * regulator_count may get initialized after that to a valid
+		 * value.
+		 */
+		if (list_empty(&opp_table->opp_list) &&
+		    opp_table->regulator_count > 0) {
+			dev_err(dev, "%s: opp-microvolt missing although OPP managing regulators\n",
+				__func__);
+			return ERR_PTR(-EINVAL);
+		}
+	}
+
+	return microvolt;
+}
+
+static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev,
+			      struct opp_table *opp_table)
+{
+	u32 *microvolt, *microamp, *microwatt;
+	int ret = 0, i, j;
+	bool triplet;
+
+	microvolt = opp_parse_microvolt(opp, dev, opp_table, &triplet);
+	if (IS_ERR(microvolt))
+		return PTR_ERR(microvolt);
+
+	microamp = _parse_named_prop(opp, dev, opp_table, "microamp", NULL);
+	if (IS_ERR(microamp)) {
+		ret = PTR_ERR(microamp);
+		goto free_microvolt;
+	}
+
+	microwatt = _parse_named_prop(opp, dev, opp_table, "microwatt", NULL);
+	if (IS_ERR(microwatt)) {
+		ret = PTR_ERR(microwatt);
+		goto free_microamp;
+	}
+
+	/*
+	 * Initialize regulator_count if it is uninitialized and no properties
+	 * are found.
+	 */
+	if (unlikely(opp_table->regulator_count == -1)) {
+		opp_table->regulator_count = 0;
+		return 0;
+	}
+
+	for (i = 0, j = 0; i < opp_table->regulator_count; i++) {
+		if (microvolt) {
+			opp->supplies[i].u_volt = microvolt[j++];
+
+			if (triplet) {
+				opp->supplies[i].u_volt_min = microvolt[j++];
+				opp->supplies[i].u_volt_max = microvolt[j++];
+			} else {
+				opp->supplies[i].u_volt_min = opp->supplies[i].u_volt;
+				opp->supplies[i].u_volt_max = opp->supplies[i].u_volt;
+			}
+		}
+
+		if (microamp)
+			opp->supplies[i].u_amp = microamp[i];
+
+		if (microwatt)
+			opp->supplies[i].u_watt = microwatt[i];
+	}
+
+	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;
+
+	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;
+	}
+
+	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;
+	}
+
+	/* The OPP tables must belong to a genpd */
+	if (unlikely(!opp_table->is_genpd)) {
+		pr_err("%s: Performance state is only valid for genpds.\n", __func__);
+		goto put_required_np;
+	}
+
+	opp = _find_opp_of_np(opp_table, required_np);
+	if (opp) {
+		pstate = opp->level;
+		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);
diff --git a/drivers/opp/opp.h b/drivers/opp/opp.h
new file mode 100644
index 0000000000..8a5ea38f3a
--- /dev/null
+++ b/drivers/opp/opp.h
@@ -0,0 +1,297 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Generic OPP Interface
+ *
+ * Copyright (C) 2009-2010 Texas Instruments Incorporated.
+ *	Nishanth Menon
+ *	Romit Dasgupta
+ *	Kevin Hilman
+ */
+
+#ifndef __DRIVER_OPP_H__
+#define __DRIVER_OPP_H__
+
+#include <linux/device.h>
+#include <linux/interconnect.h>
+#include <linux/kernel.h>
+#include <linux/kref.h>
+#include <linux/list.h>
+#include <linux/limits.h>
+#include <linux/pm_opp.h>
+#include <linux/notifier.h>
+
+struct clk;
+struct regulator;
+
+/* Lock to allow exclusive modification to the device and opp lists */
+extern struct mutex opp_table_lock;
+
+extern struct list_head opp_tables;
+
+/* OPP Config flags */
+#define OPP_CONFIG_CLK			BIT(0)
+#define OPP_CONFIG_REGULATOR		BIT(1)
+#define OPP_CONFIG_REGULATOR_HELPER	BIT(2)
+#define OPP_CONFIG_PROP_NAME		BIT(3)
+#define OPP_CONFIG_SUPPORTED_HW		BIT(4)
+#define OPP_CONFIG_GENPD		BIT(5)
+
+/**
+ * struct opp_config_data - data for set config operations
+ * @opp_table: OPP table
+ * @flags: OPP config flags
+ *
+ * This structure stores the OPP config information for each OPP table
+ * configuration by the callers.
+ */
+struct opp_config_data {
+	struct opp_table *opp_table;
+	unsigned int flags;
+};
+
+/*
+ * Internal data structure organization with the OPP layer library is as
+ * follows:
+ * opp_tables (root)
+ *	|- device 1 (represents voltage domain 1)
+ *	|	|- opp 1 (availability, freq, voltage)
+ *	|	|- opp 2 ..
+ *	...	...
+ *	|	`- opp n ..
+ *	|- device 2 (represents the next voltage domain)
+ *	...
+ *	`- device m (represents mth voltage domain)
+ * device 1, 2.. are represented by opp_table structure while each opp
+ * is represented by the opp structure.
+ */
+
+/**
+ * struct dev_pm_opp - Generic OPP description structure
+ * @node:	opp table node. The nodes are maintained throughout the lifetime
+ *		of boot. It is expected only an optimal set of OPPs are
+ *		added to the library by the SoC framework.
+ *		IMPORTANT: the opp nodes should be maintained in increasing
+ *		order.
+ * @kref:	for reference count of the OPP.
+ * @available:	true/false - marks if this OPP as available or not
+ * @dynamic:	not-created from static DT entries.
+ * @turbo:	true if turbo (boost) OPP
+ * @suspend:	true if suspend OPP
+ * @removed:	flag indicating that OPP's reference is dropped by OPP core.
+ * @rates:	Frequencies in hertz
+ * @level:	Performance level
+ * @supplies:	Power supplies voltage/current values
+ * @bandwidth:	Interconnect bandwidth values
+ * @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's
+ *		frequency from any other OPP's frequency.
+ * @required_opps: List of OPPs that are required by this OPP.
+ * @opp_table:	points back to the opp_table struct this opp belongs to
+ * @np:		OPP's device node.
+ * @dentry:	debugfs dentry pointer (per opp)
+ *
+ * This structure stores the OPP information for a given device.
+ */
+struct dev_pm_opp {
+	struct list_head node;
+	struct kref kref;
+
+	bool available;
+	bool dynamic;
+	bool turbo;
+	bool suspend;
+	bool removed;
+	unsigned long *rates;
+	unsigned int level;
+
+	struct dev_pm_opp_supply *supplies;
+	struct dev_pm_opp_icc_bw *bandwidth;
+
+	unsigned long clock_latency_ns;
+
+	struct dev_pm_opp **required_opps;
+	struct opp_table *opp_table;
+
+	struct device_node *np;
+
+#ifdef CONFIG_DEBUG_FS
+	struct dentry *dentry;
+	const char *of_name;
+#endif
+};
+
+/**
+ * struct opp_device - devices managed by 'struct opp_table'
+ * @node:	list node
+ * @dev:	device to which the struct object belongs
+ * @dentry:	debugfs dentry pointer (per device)
+ *
+ * This is an internal data structure maintaining the devices that are managed
+ * by 'struct opp_table'.
+ */
+struct opp_device {
+	struct list_head node;
+	const struct device *dev;
+
+#ifdef CONFIG_DEBUG_FS
+	struct dentry *dentry;
+#endif
+};
+
+enum opp_table_access {
+	OPP_TABLE_ACCESS_UNKNOWN = 0,
+	OPP_TABLE_ACCESS_EXCLUSIVE = 1,
+	OPP_TABLE_ACCESS_SHARED = 2,
+};
+
+/**
+ * struct opp_table - Device opp structure
+ * @node:	table node - contains the devices with OPPs that
+ *		have been registered. Nodes once added are not modified in this
+ *		table.
+ * @head:	notifier head to notify the OPP availability changes.
+ * @dev_list:	list of devices that share these OPPs
+ * @opp_list:	table of opps
+ * @kref:	for reference count of the table.
+ * @lock:	mutex protecting the opp_list and dev_list.
+ * @np:		struct device_node pointer for opp's DT node.
+ * @clock_latency_ns_max: Max clock latency in nanoseconds.
+ * @parsed_static_opps: Count of devices for which OPPs are initialized from DT.
+ * @shared_opp: OPP is shared between multiple devices.
+ * @rate_clk_single: Currently configured frequency for single clk.
+ * @current_opp: Currently configured OPP for the table.
+ * @suspend_opp: Pointer to OPP to be used during device suspend.
+ * @genpd_virt_dev_lock: Mutex protecting the genpd virtual device pointers.
+ * @genpd_virt_devs: List of virtual devices for multiple genpd support.
+ * @required_opp_tables: List of device OPP tables that are required by OPPs in
+ *		this table.
+ * @required_opp_count: Number of required devices.
+ * @supported_hw: Array of version number to support.
+ * @supported_hw_count: Number of elements in supported_hw array.
+ * @prop_name: A name to postfix to many DT properties, while parsing them.
+ * @config_clks: Platform specific config_clks() callback.
+ * @clks: Device's clock handles, for multiple clocks.
+ * @clk: Device's clock handle, for single clock.
+ * @clk_count: Number of clocks.
+ * @config_regulators: Platform specific config_regulators() callback.
+ * @regulators: Supply regulators
+ * @regulator_count: Number of power supply regulators. Its value can be -1
+ * (uninitialized), 0 (no opp-microvolt property) or > 0 (has opp-microvolt
+ * property).
+ * @paths: Interconnect path handles
+ * @path_count: Number of interconnect paths
+ * @enabled: Set to true if the device's resources are enabled/configured.
+ * @is_genpd: Marks if the OPP table belongs to a genpd.
+ * @set_required_opps: Helper responsible to set required OPPs.
+ * @dentry:	debugfs dentry pointer of the real device directory (not links).
+ * @dentry_name: Name of the real dentry.
+ *
+ * @voltage_tolerance_v1: In percentage, for v1 bindings only.
+ *
+ * This is an internal data structure maintaining the link to opps attached to
+ * a device. This structure is not meant to be shared to users as it is
+ * meant for book keeping and private to OPP library.
+ */
+struct opp_table {
+	struct list_head node, lazy;
+
+	struct blocking_notifier_head head;
+	struct list_head dev_list;
+	struct list_head opp_list;
+	struct kref kref;
+	struct mutex lock;
+
+	struct device_node *np;
+	unsigned long clock_latency_ns_max;
+
+	/* For backward compatibility with v1 bindings */
+	unsigned int voltage_tolerance_v1;
+
+	unsigned int parsed_static_opps;
+	enum opp_table_access shared_opp;
+	unsigned long rate_clk_single;
+	struct dev_pm_opp *current_opp;
+	struct dev_pm_opp *suspend_opp;
+
+	struct mutex genpd_virt_dev_lock;
+	struct device **genpd_virt_devs;
+	struct opp_table **required_opp_tables;
+	unsigned int required_opp_count;
+
+	unsigned int *supported_hw;
+	unsigned int supported_hw_count;
+	const char *prop_name;
+	config_clks_t config_clks;
+	struct clk **clks;
+	struct clk *clk;
+	int clk_count;
+	config_regulators_t config_regulators;
+	struct regulator **regulators;
+	int regulator_count;
+	struct icc_path **paths;
+	unsigned int path_count;
+	bool enabled;
+	bool is_genpd;
+	int (*set_required_opps)(struct device *dev,
+		struct opp_table *opp_table, struct dev_pm_opp *opp, bool scaling_down);
+
+#ifdef CONFIG_DEBUG_FS
+	struct dentry *dentry;
+	char dentry_name[NAME_MAX];
+#endif
+};
+
+/* Routines internal to opp core */
+void dev_pm_opp_get(struct dev_pm_opp *opp);
+bool _opp_remove_all_static(struct opp_table *opp_table);
+void _get_opp_table_kref(struct opp_table *opp_table);
+int _get_opp_count(struct opp_table *opp_table);
+struct opp_table *_find_opp_table(struct device *dev);
+struct opp_device *_add_opp_dev(const struct device *dev, struct opp_table *opp_table);
+struct dev_pm_opp *_opp_allocate(struct opp_table *opp_table);
+void _opp_free(struct dev_pm_opp *opp);
+int _opp_compare_key(struct opp_table *opp_table, struct dev_pm_opp *opp1, struct dev_pm_opp *opp2);
+int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, struct opp_table *opp_table);
+int _opp_add_v1(struct opp_table *opp_table, struct device *dev, unsigned long freq, long u_volt, bool dynamic);
+void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, int last_cpu);
+struct opp_table *_add_opp_table_indexed(struct device *dev, int index, bool getclk);
+void _put_opp_list_kref(struct opp_table *opp_table);
+void _required_opps_available(struct dev_pm_opp *opp, int count);
+void _update_set_required_opps(struct opp_table *opp_table);
+
+static inline bool lazy_linking_pending(struct opp_table *opp_table)
+{
+	return unlikely(!list_empty(&opp_table->lazy));
+}
+
+#ifdef CONFIG_OF
+void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index);
+void _of_clear_opp_table(struct opp_table *opp_table);
+struct opp_table *_managed_opp(struct device *dev, int index);
+void _of_clear_opp(struct opp_table *opp_table, struct dev_pm_opp *opp);
+#else
+static inline void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index) {}
+static inline void _of_clear_opp_table(struct opp_table *opp_table) {}
+static inline struct opp_table *_managed_opp(struct device *dev, int index) { return NULL; }
+static inline void _of_clear_opp(struct opp_table *opp_table, struct dev_pm_opp *opp) {}
+#endif
+
+#ifdef CONFIG_DEBUG_FS
+void opp_debug_remove_one(struct dev_pm_opp *opp);
+void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table);
+void opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table);
+void opp_debug_unregister(struct opp_device *opp_dev, struct opp_table *opp_table);
+#else
+static inline void opp_debug_remove_one(struct dev_pm_opp *opp) {}
+
+static inline void opp_debug_create_one(struct dev_pm_opp *opp,
+					struct opp_table *opp_table) { }
+
+static inline void opp_debug_register(struct opp_device *opp_dev,
+				      struct opp_table *opp_table) { }
+
+static inline void opp_debug_unregister(struct opp_device *opp_dev,
+					struct opp_table *opp_table)
+{ }
+#endif		/* DEBUG_FS */
+
+#endif		/* __DRIVER_OPP_H__ */
diff --git a/drivers/opp/ti-opp-supply.c b/drivers/opp/ti-opp-supply.c
new file mode 100644
index 0000000000..8f3f13fbbb
--- /dev/null
+++ b/drivers/opp/ti-opp-supply.c
@@ -0,0 +1,420 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2016-2017 Texas Instruments Incorporated - https://www.ti.com/
+ *	Nishanth Menon <nm@ti.com>
+ *	Dave Gerlach <d-gerlach@ti.com>
+ *
+ * TI OPP supply driver that provides override into the regulator control
+ * for generic opp core to handle devices with ABB regulator and/or
+ * SmartReflex Class0.
+ */
+#include <linux/clk.h>
+#include <linux/cpufreq.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/of_device.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_opp.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+
+/**
+ * struct ti_opp_supply_optimum_voltage_table - optimized voltage table
+ * @reference_uv:	reference voltage (usually Nominal voltage)
+ * @optimized_uv:	Optimized voltage from efuse
+ */
+struct ti_opp_supply_optimum_voltage_table {
+	unsigned int reference_uv;
+	unsigned int optimized_uv;
+};
+
+/**
+ * struct ti_opp_supply_data - OMAP specific opp supply data
+ * @vdd_table:	Optimized voltage mapping table
+ * @num_vdd_table: number of entries in vdd_table
+ * @vdd_absolute_max_voltage_uv: absolute maximum voltage in UV for the supply
+ * @old_supplies: Placeholder for supplies information for old OPP.
+ * @new_supplies: Placeholder for supplies information for new OPP.
+ */
+struct ti_opp_supply_data {
+	struct ti_opp_supply_optimum_voltage_table *vdd_table;
+	u32 num_vdd_table;
+	u32 vdd_absolute_max_voltage_uv;
+	struct dev_pm_opp_supply old_supplies[2];
+	struct dev_pm_opp_supply new_supplies[2];
+};
+
+static struct ti_opp_supply_data opp_data;
+
+/**
+ * struct ti_opp_supply_of_data - device tree match data
+ * @flags:	specific type of opp supply
+ * @efuse_voltage_mask: mask required for efuse register representing voltage
+ * @efuse_voltage_uv: Are the efuse entries in micro-volts? if not, assume
+ *		milli-volts.
+ */
+struct ti_opp_supply_of_data {
+#define OPPDM_EFUSE_CLASS0_OPTIMIZED_VOLTAGE	BIT(1)
+#define OPPDM_HAS_NO_ABB			BIT(2)
+	const u8 flags;
+	const u32 efuse_voltage_mask;
+	const bool efuse_voltage_uv;
+};
+
+/**
+ * _store_optimized_voltages() - store optimized voltages
+ * @dev:	ti opp supply device for which we need to store info
+ * @data:	data specific to the device
+ *
+ * Picks up efuse based optimized voltages for VDD unique per device and
+ * stores it in internal data structure for use during transition requests.
+ *
+ * Return: If successful, 0, else appropriate error value.
+ */
+static int _store_optimized_voltages(struct device *dev,
+				     struct ti_opp_supply_data *data)
+{
+	void __iomem *base;
+	struct property *prop;
+	struct resource *res;
+	const __be32 *val;
+	int proplen, i;
+	int ret = 0;
+	struct ti_opp_supply_optimum_voltage_table *table;
+	const struct ti_opp_supply_of_data *of_data = dev_get_drvdata(dev);
+
+	/* pick up Efuse based voltages */
+	res = platform_get_resource(to_platform_device(dev), IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(dev, "Unable to get IO resource\n");
+		ret = -ENODEV;
+		goto out_map;
+	}
+
+	base = ioremap(res->start, resource_size(res));
+	if (!base) {
+		dev_err(dev, "Unable to map Efuse registers\n");
+		ret = -ENOMEM;
+		goto out_map;
+	}
+
+	/* Fetch efuse-settings. */
+	prop = of_find_property(dev->of_node, "ti,efuse-settings", NULL);
+	if (!prop) {
+		dev_err(dev, "No 'ti,efuse-settings' property found\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	proplen = prop->length / sizeof(int);
+	data->num_vdd_table = proplen / 2;
+	/* Verify for corrupted OPP entries in dt */
+	if (data->num_vdd_table * 2 * sizeof(int) != prop->length) {
+		dev_err(dev, "Invalid 'ti,efuse-settings'\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	ret = of_property_read_u32(dev->of_node, "ti,absolute-max-voltage-uv",
+				   &data->vdd_absolute_max_voltage_uv);
+	if (ret) {
+		dev_err(dev, "ti,absolute-max-voltage-uv is missing\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	table = kcalloc(data->num_vdd_table, sizeof(*data->vdd_table),
+			GFP_KERNEL);
+	if (!table) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	data->vdd_table = table;
+
+	val = prop->value;
+	for (i = 0; i < data->num_vdd_table; i++, table++) {
+		u32 efuse_offset;
+		u32 tmp;
+
+		table->reference_uv = be32_to_cpup(val++);
+		efuse_offset = be32_to_cpup(val++);
+
+		tmp = readl(base + efuse_offset);
+		tmp &= of_data->efuse_voltage_mask;
+		tmp >>= __ffs(of_data->efuse_voltage_mask);
+
+		table->optimized_uv = of_data->efuse_voltage_uv ? tmp :
+					tmp * 1000;
+
+		dev_dbg(dev, "[%d] efuse=0x%08x volt_table=%d vset=%d\n",
+			i, efuse_offset, table->reference_uv,
+			table->optimized_uv);
+
+		/*
+		 * Some older samples might not have optimized efuse
+		 * Use reference voltage for those - just add debug message
+		 * for them.
+		 */
+		if (!table->optimized_uv) {
+			dev_dbg(dev, "[%d] efuse=0x%08x volt_table=%d:vset0\n",
+				i, efuse_offset, table->reference_uv);
+			table->optimized_uv = table->reference_uv;
+		}
+	}
+out:
+	iounmap(base);
+out_map:
+	return ret;
+}
+
+/**
+ * _free_optimized_voltages() - free resources for optvoltages
+ * @dev:	device for which we need to free info
+ * @data:	data specific to the device
+ */
+static void _free_optimized_voltages(struct device *dev,
+				     struct ti_opp_supply_data *data)
+{
+	kfree(data->vdd_table);
+	data->vdd_table = NULL;
+	data->num_vdd_table = 0;
+}
+
+/**
+ * _get_optimal_vdd_voltage() - Finds optimal voltage for the supply
+ * @dev:	device for which we need to find info
+ * @data:	data specific to the device
+ * @reference_uv:	reference voltage (OPP voltage) for which we need value
+ *
+ * Return: if a match is found, return optimized voltage, else return
+ * reference_uv, also return reference_uv if no optimization is needed.
+ */
+static int _get_optimal_vdd_voltage(struct device *dev,
+				    struct ti_opp_supply_data *data,
+				    int reference_uv)
+{
+	int i;
+	struct ti_opp_supply_optimum_voltage_table *table;
+
+	if (!data->num_vdd_table)
+		return reference_uv;
+
+	table = data->vdd_table;
+	if (!table)
+		return -EINVAL;
+
+	/* Find a exact match - this list is usually very small */
+	for (i = 0; i < data->num_vdd_table; i++, table++)
+		if (table->reference_uv == reference_uv)
+			return table->optimized_uv;
+
+	/* IF things are screwed up, we'd make a mess on console.. ratelimit */
+	dev_err_ratelimited(dev, "%s: Failed optimized voltage match for %d\n",
+			    __func__, reference_uv);
+	return reference_uv;
+}
+
+static int _opp_set_voltage(struct device *dev,
+			    struct dev_pm_opp_supply *supply,
+			    int new_target_uv, struct regulator *reg,
+			    char *reg_name)
+{
+	int ret;
+	unsigned long vdd_uv, uv_max;
+
+	if (new_target_uv)
+		vdd_uv = new_target_uv;
+	else
+		vdd_uv = supply->u_volt;
+
+	/*
+	 * If we do have an absolute max voltage specified, then we should
+	 * use that voltage instead to allow for cases where the voltage rails
+	 * are ganged (example if we set the max for an opp as 1.12v, and
+	 * the absolute max is 1.5v, for another rail to get 1.25v, it cannot
+	 * be achieved if the regulator is constrainted to max of 1.12v, even
+	 * if it can function at 1.25v
+	 */
+	if (opp_data.vdd_absolute_max_voltage_uv)
+		uv_max = opp_data.vdd_absolute_max_voltage_uv;
+	else
+		uv_max = supply->u_volt_max;
+
+	if (vdd_uv > uv_max ||
+	    vdd_uv < supply->u_volt_min ||
+	    supply->u_volt_min > uv_max) {
+		dev_warn(dev,
+			 "Invalid range voltages [Min:%lu target:%lu Max:%lu]\n",
+			 supply->u_volt_min, vdd_uv, uv_max);
+		return -EINVAL;
+	}
+
+	dev_dbg(dev, "%s scaling to %luuV[min %luuV max %luuV]\n", reg_name,
+		vdd_uv, supply->u_volt_min,
+		uv_max);
+
+	ret = regulator_set_voltage_triplet(reg,
+					    supply->u_volt_min,
+					    vdd_uv,
+					    uv_max);
+	if (ret) {
+		dev_err(dev, "%s failed for %luuV[min %luuV max %luuV]\n",
+			reg_name, vdd_uv, supply->u_volt_min,
+			uv_max);
+		return ret;
+	}
+
+	return 0;
+}
+
+/* Do the opp supply transition */
+static int ti_opp_config_regulators(struct device *dev,
+			struct dev_pm_opp *old_opp, struct dev_pm_opp *new_opp,
+			struct regulator **regulators, unsigned int count)
+{
+	struct dev_pm_opp_supply *old_supply_vdd = &opp_data.old_supplies[0];
+	struct dev_pm_opp_supply *old_supply_vbb = &opp_data.old_supplies[1];
+	struct dev_pm_opp_supply *new_supply_vdd = &opp_data.new_supplies[0];
+	struct dev_pm_opp_supply *new_supply_vbb = &opp_data.new_supplies[1];
+	struct regulator *vdd_reg = regulators[0];
+	struct regulator *vbb_reg = regulators[1];
+	unsigned long old_freq, freq;
+	int vdd_uv;
+	int ret;
+
+	/* We must have two regulators here */
+	WARN_ON(count != 2);
+
+	/* Fetch supplies and freq information from OPP core */
+	ret = dev_pm_opp_get_supplies(new_opp, opp_data.new_supplies);
+	WARN_ON(ret);
+
+	old_freq = dev_pm_opp_get_freq(old_opp);
+	freq = dev_pm_opp_get_freq(new_opp);
+	WARN_ON(!old_freq || !freq);
+
+	vdd_uv = _get_optimal_vdd_voltage(dev, &opp_data,
+					  new_supply_vdd->u_volt);
+
+	if (new_supply_vdd->u_volt_min < vdd_uv)
+		new_supply_vdd->u_volt_min = vdd_uv;
+
+	/* Scaling up? Scale voltage before frequency */
+	if (freq > old_freq) {
+		ret = _opp_set_voltage(dev, new_supply_vdd, vdd_uv, vdd_reg,
+				       "vdd");
+		if (ret)
+			goto restore_voltage;
+
+		ret = _opp_set_voltage(dev, new_supply_vbb, 0, vbb_reg, "vbb");
+		if (ret)
+			goto restore_voltage;
+	} else {
+		ret = _opp_set_voltage(dev, new_supply_vbb, 0, vbb_reg, "vbb");
+		if (ret)
+			goto restore_voltage;
+
+		ret = _opp_set_voltage(dev, new_supply_vdd, vdd_uv, vdd_reg,
+				       "vdd");
+		if (ret)
+			goto restore_voltage;
+	}
+
+	return 0;
+
+restore_voltage:
+	/* Fetch old supplies information only if required */
+	ret = dev_pm_opp_get_supplies(old_opp, opp_data.old_supplies);
+	WARN_ON(ret);
+
+	/* This shouldn't harm even if the voltages weren't updated earlier */
+	if (old_supply_vdd->u_volt) {
+		ret = _opp_set_voltage(dev, old_supply_vbb, 0, vbb_reg, "vbb");
+		if (ret)
+			return ret;
+
+		ret = _opp_set_voltage(dev, old_supply_vdd, 0, vdd_reg,
+				       "vdd");
+		if (ret)
+			return ret;
+	}
+
+	return ret;
+}
+
+static const struct ti_opp_supply_of_data omap_generic_of_data = {
+};
+
+static const struct ti_opp_supply_of_data omap_omap5_of_data = {
+	.flags = OPPDM_EFUSE_CLASS0_OPTIMIZED_VOLTAGE,
+	.efuse_voltage_mask = 0xFFF,
+	.efuse_voltage_uv = false,
+};
+
+static const struct ti_opp_supply_of_data omap_omap5core_of_data = {
+	.flags = OPPDM_EFUSE_CLASS0_OPTIMIZED_VOLTAGE | OPPDM_HAS_NO_ABB,
+	.efuse_voltage_mask = 0xFFF,
+	.efuse_voltage_uv = false,
+};
+
+static const struct of_device_id ti_opp_supply_of_match[] = {
+	{.compatible = "ti,omap-opp-supply", .data = &omap_generic_of_data},
+	{.compatible = "ti,omap5-opp-supply", .data = &omap_omap5_of_data},
+	{.compatible = "ti,omap5-core-opp-supply",
+	 .data = &omap_omap5core_of_data},
+	{},
+};
+MODULE_DEVICE_TABLE(of, ti_opp_supply_of_match);
+
+static int ti_opp_supply_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device *cpu_dev = get_cpu_device(0);
+	const struct of_device_id *match;
+	const struct ti_opp_supply_of_data *of_data;
+	int ret = 0;
+
+	match = of_match_device(ti_opp_supply_of_match, dev);
+	if (!match) {
+		/* We do not expect this to happen */
+		dev_err(dev, "%s: Unable to match device\n", __func__);
+		return -ENODEV;
+	}
+	if (!match->data) {
+		/* Again, unlikely.. but mistakes do happen */
+		dev_err(dev, "%s: Bad data in match\n", __func__);
+		return -EINVAL;
+	}
+	of_data = match->data;
+
+	dev_set_drvdata(dev, (void *)of_data);
+
+	/* If we need optimized voltage */
+	if (of_data->flags & OPPDM_EFUSE_CLASS0_OPTIMIZED_VOLTAGE) {
+		ret = _store_optimized_voltages(dev, &opp_data);
+		if (ret)
+			return ret;
+	}
+
+	ret = dev_pm_opp_set_config_regulators(cpu_dev, ti_opp_config_regulators);
+	if (ret < 0)
+		_free_optimized_voltages(dev, &opp_data);
+
+	return ret;
+}
+
+static struct platform_driver ti_opp_supply_driver = {
+	.probe = ti_opp_supply_probe,
+	.driver = {
+		   .name = "ti_opp_supply",
+		   .of_match_table = of_match_ptr(ti_opp_supply_of_match),
+		   },
+};
+module_platform_driver(ti_opp_supply_driver);
+
+MODULE_DESCRIPTION("Texas Instruments OMAP OPP Supply driver");
+MODULE_AUTHOR("Texas Instruments Inc.");
+MODULE_LICENSE("GPL v2");