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Date: Thu, 05 May 2016 15:59:05 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Viresh Kumar <viresh.kumar@...aro.org>
Cc: Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
Stephen Boyd <sboyd@...eaurora.org>,
linaro-kernel@...ts.linaro.org, linux-pm@...r.kernel.org,
eric.engestrom@...tec.com, rufus.hamade@...tec.com,
sudeep.holla@....com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PM / OPP: Move CONFIG_OF dependent code in a separate file
On Thursday, May 05, 2016 04:20:33 PM Viresh Kumar wrote:
> Recently few issues were noticed in the code where CONFIG_OF wasn't
> consistently used for many routines. The core file is big enough now and
> ifdef hackery makes it less readable.
>
> Move OF specific code to another file and compile that only if CONFIG_OF
> is enabled.
>
> Compile-tested:
> - For ARM (exynos) with CONFIG_OF enabled
> - For X86 with CONFIG_OF disabled (have to enable CONFIG_PM_OPP separately)
>
> No functional changes.
>
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
I like this.
Any objections anyone?
> ---
> drivers/base/power/opp/Makefile | 1 +
> drivers/base/power/opp/core.c | 448 +-----------------------------
> drivers/base/power/opp/cpu.c | 143 +---------
> drivers/base/power/opp/of.c | 591 ++++++++++++++++++++++++++++++++++++++++
> drivers/base/power/opp/opp.h | 14 +
> 5 files changed, 618 insertions(+), 579 deletions(-)
> create mode 100644 drivers/base/power/opp/of.c
>
> diff --git a/drivers/base/power/opp/Makefile b/drivers/base/power/opp/Makefile
> index 19837ef04d8e..e70ceb406fe9 100644
> --- a/drivers/base/power/opp/Makefile
> +++ b/drivers/base/power/opp/Makefile
> @@ -1,3 +1,4 @@
> ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG
> obj-y += core.o cpu.o
> +obj-$(CONFIG_OF) += of.o
> obj-$(CONFIG_DEBUG_FS) += debugfs.o
> diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c
> index d41dd38aadb6..7c04c87738a6 100644
> --- a/drivers/base/power/opp/core.c
> +++ b/drivers/base/power/opp/core.c
> @@ -18,7 +18,6 @@
> #include <linux/err.h>
> #include <linux/slab.h>
> #include <linux/device.h>
> -#include <linux/of.h>
> #include <linux/export.h>
> #include <linux/regulator/consumer.h>
>
> @@ -29,7 +28,7 @@
> * from here, with each opp_table containing the list of opps it supports in
> * various states of availability.
> */
> -static LIST_HEAD(opp_tables);
> +LIST_HEAD(opp_tables);
> /* Lock to allow exclusive modification to the device and opp lists */
> DEFINE_MUTEX(opp_table_lock);
>
> @@ -53,26 +52,6 @@ static struct opp_device *_find_opp_dev(const struct device *dev,
> return NULL;
> }
>
> -static struct opp_table *_managed_opp(const struct device_node *np)
> -{
> - struct opp_table *opp_table;
> -
> - list_for_each_entry_rcu(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.
> - */
> - return opp_table->shared_opp ? opp_table : NULL;
> - }
> - }
> -
> - return NULL;
> -}
> -
> /**
> * _find_opp_table() - find opp_table struct using device pointer
> * @dev: device pointer used to lookup OPP table
> @@ -757,7 +736,6 @@ static struct opp_table *_add_opp_table(struct device *dev)
> {
> struct opp_table *opp_table;
> struct opp_device *opp_dev;
> - struct device_node *np;
> int ret;
>
> /* Check for existing table for 'dev' first */
> @@ -781,20 +759,7 @@ static struct opp_table *_add_opp_table(struct device *dev)
> return NULL;
> }
>
> - /*
> - * 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) {
> - u32 val;
> -
> - 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);
> - of_node_put(np);
> - }
> + _of_init_opp_table(opp_table, dev);
>
> /* Set regulator to a non-NULL error value */
> opp_table->regulator = ERR_PTR(-ENXIO);
> @@ -890,8 +855,8 @@ static void _kfree_opp_rcu(struct rcu_head *head)
> * It is assumed that the caller holds required mutex for an RCU updater
> * strategy.
> */
> -static void _opp_remove(struct opp_table *opp_table,
> - struct dev_pm_opp *opp, bool notify)
> +void _opp_remove(struct opp_table *opp_table, struct dev_pm_opp *opp,
> + bool notify)
> {
> /*
> * Notify the changes in the availability of the operable
> @@ -952,8 +917,8 @@ void dev_pm_opp_remove(struct device *dev, unsigned long freq)
> }
> EXPORT_SYMBOL_GPL(dev_pm_opp_remove);
>
> -static struct dev_pm_opp *_allocate_opp(struct device *dev,
> - struct opp_table **opp_table)
> +struct dev_pm_opp *_allocate_opp(struct device *dev,
> + struct opp_table **opp_table)
> {
> struct dev_pm_opp *opp;
>
> @@ -989,8 +954,8 @@ static bool _opp_supported_by_regulators(struct dev_pm_opp *opp,
> return true;
> }
>
> -static int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
> - struct opp_table *opp_table)
> +int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
> + struct opp_table *opp_table)
> {
> struct dev_pm_opp *opp;
> struct list_head *head = &opp_table->opp_list;
> @@ -1066,8 +1031,8 @@ static int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
> * Duplicate OPPs (both freq and volt are same) and !opp->available
> * -ENOMEM Memory allocation failure
> */
> -static int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt,
> - bool dynamic)
> +int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt,
> + bool dynamic)
> {
> struct opp_table *opp_table;
> struct dev_pm_opp *new_opp;
> @@ -1112,83 +1077,6 @@ static int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt,
> return ret;
> }
>
> -/* TODO: Support multiple regulators */
> -static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev,
> - struct opp_table *opp_table)
> -{
> - u32 microvolt[3] = {0};
> - u32 val;
> - int count, ret;
> - struct property *prop = NULL;
> - char name[NAME_MAX];
> -
> - /* Search for "opp-microvolt-<name>" */
> - if (opp_table->prop_name) {
> - snprintf(name, sizeof(name), "opp-microvolt-%s",
> - opp_table->prop_name);
> - prop = of_find_property(opp->np, name, NULL);
> - }
> -
> - if (!prop) {
> - /* Search for "opp-microvolt" */
> - sprintf(name, "opp-microvolt");
> - prop = of_find_property(opp->np, name, NULL);
> -
> - /* Missing property isn't a problem, but an invalid entry is */
> - if (!prop)
> - return 0;
> - }
> -
> - 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 count;
> - }
> -
> - /* There can be one or three elements here */
> - if (count != 1 && count != 3) {
> - dev_err(dev, "%s: Invalid number of elements in %s property (%d)\n",
> - __func__, name, count);
> - return -EINVAL;
> - }
> -
> - ret = of_property_read_u32_array(opp->np, name, microvolt, count);
> - if (ret) {
> - dev_err(dev, "%s: error parsing %s: %d\n", __func__, name, ret);
> - return -EINVAL;
> - }
> -
> - opp->u_volt = microvolt[0];
> -
> - if (count == 1) {
> - opp->u_volt_min = opp->u_volt;
> - opp->u_volt_max = opp->u_volt;
> - } else {
> - opp->u_volt_min = microvolt[1];
> - opp->u_volt_max = microvolt[2];
> - }
> -
> - /* Search for "opp-microamp-<name>" */
> - prop = NULL;
> - if (opp_table->prop_name) {
> - snprintf(name, sizeof(name), "opp-microamp-%s",
> - opp_table->prop_name);
> - prop = of_find_property(opp->np, name, NULL);
> - }
> -
> - if (!prop) {
> - /* Search for "opp-microamp" */
> - sprintf(name, "opp-microamp");
> - prop = of_find_property(opp->np, name, NULL);
> - }
> -
> - if (prop && !of_property_read_u32(opp->np, name, &val))
> - opp->u_amp = val;
> -
> - return 0;
> -}
> -
> /**
> * dev_pm_opp_set_supported_hw() - Set supported platforms
> * @dev: Device for which supported-hw has to be set.
> @@ -1517,144 +1405,6 @@ void dev_pm_opp_put_regulator(struct device *dev)
> }
> EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulator);
>
> -static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table,
> - struct device_node *np)
> -{
> - unsigned int count = opp_table->supported_hw_count;
> - u32 version;
> - int ret;
> -
> - if (!opp_table->supported_hw)
> - return true;
> -
> - while (count--) {
> - ret = of_property_read_u32_index(np, "opp-supported-hw", count,
> - &version);
> - if (ret) {
> - dev_warn(dev, "%s: failed to read opp-supported-hw property at index %d: %d\n",
> - __func__, count, ret);
> - return false;
> - }
> -
> - /* Both of these are bitwise masks of the versions */
> - if (!(version & opp_table->supported_hw[count]))
> - return false;
> - }
> -
> - return true;
> -}
> -
> -/**
> - * _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings)
> - * @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.
> - *
> - * Locking: The internal opp_table and opp structures are RCU protected.
> - * Hence this function internally uses RCU updater strategy with mutex locks
> - * to keep the integrity of the internal data structures. Callers should ensure
> - * that this function is *NOT* called under RCU protection or in contexts where
> - * mutex cannot be locked.
> - *
> - * 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
> - * -EINVAL Failed parsing the OPP node
> - */
> -static int _opp_add_static_v2(struct device *dev, struct device_node *np)
> -{
> - struct opp_table *opp_table;
> - struct dev_pm_opp *new_opp;
> - u64 rate;
> - u32 val;
> - int ret;
> -
> - /* Hold our table modification lock here */
> - mutex_lock(&opp_table_lock);
> -
> - new_opp = _allocate_opp(dev, &opp_table);
> - if (!new_opp) {
> - ret = -ENOMEM;
> - goto unlock;
> - }
> -
> - ret = of_property_read_u64(np, "opp-hz", &rate);
> - if (ret < 0) {
> - dev_err(dev, "%s: opp-hz 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: %llu\n", rate);
> - goto free_opp;
> - }
> -
> - /*
> - * 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.
> - */
> - new_opp->rate = (unsigned long)rate;
> - new_opp->turbo = of_property_read_bool(np, "turbo-mode");
> -
> - new_opp->np = np;
> - new_opp->dynamic = false;
> - new_opp->available = true;
> -
> - 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_opp;
> -
> - ret = _opp_add(dev, new_opp, opp_table);
> - if (ret)
> - goto free_opp;
> -
> - /* OPP to select on device suspend */
> - if (of_property_read_bool(np, "opp-suspend")) {
> - if (opp_table->suspend_opp) {
> - dev_warn(dev, "%s: Multiple suspend OPPs found (%lu %lu)\n",
> - __func__, opp_table->suspend_opp->rate,
> - new_opp->rate);
> - } 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;
> -
> - mutex_unlock(&opp_table_lock);
> -
> - pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n",
> - __func__, new_opp->turbo, new_opp->rate, new_opp->u_volt,
> - new_opp->u_volt_min, new_opp->u_volt_max,
> - new_opp->clock_latency_ns);
> -
> - /*
> - * Notify the changes in the availability of the operable
> - * frequency/voltage list.
> - */
> - srcu_notifier_call_chain(&opp_table->srcu_head, OPP_EVENT_ADD, new_opp);
> - return 0;
> -
> -free_opp:
> - _opp_remove(opp_table, new_opp, false);
> -unlock:
> - mutex_unlock(&opp_table_lock);
> - return ret;
> -}
> -
> /**
> * dev_pm_opp_add() - Add an OPP table from a table definitions
> * @dev: device for which we do this operation
> @@ -1846,7 +1596,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_get_notifier);
> * Free OPPs either created using static entries present in DT or even the
> * dynamically added entries based on remove_all param.
> */
> -static void _dev_pm_opp_remove_table(struct device *dev, bool remove_all)
> +void _dev_pm_opp_remove_table(struct device *dev, bool remove_all)
> {
> struct opp_table *opp_table;
> struct dev_pm_opp *opp, *tmp;
> @@ -1900,179 +1650,3 @@ void dev_pm_opp_remove_table(struct device *dev)
> _dev_pm_opp_remove_table(dev, true);
> }
> EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table);
> -
> -#ifdef CONFIG_OF
> -/**
> - * 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.
> - *
> - * Locking: The internal opp_table and opp structures are RCU protected.
> - * Hence this function indirectly uses RCU updater strategy with mutex locks
> - * to keep the integrity of the internal data structures. Callers should ensure
> - * that this function is *NOT* called under RCU protection or in contexts where
> - * mutex cannot be locked.
> - */
> -void dev_pm_opp_of_remove_table(struct device *dev)
> -{
> - _dev_pm_opp_remove_table(dev, false);
> -}
> -EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table);
> -
> -/* Returns opp descriptor node for a device, caller must do of_node_put() */
> -struct device_node *_of_get_opp_desc_node(struct device *dev)
> -{
> - /*
> - * TODO: Support for multiple OPP tables.
> - *
> - * There should be only ONE phandle present in "operating-points-v2"
> - * property.
> - */
> -
> - return of_parse_phandle(dev->of_node, "operating-points-v2", 0);
> -}
> -
> -/* Initializes OPP tables based on new bindings */
> -static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np)
> -{
> - struct device_node *np;
> - struct opp_table *opp_table;
> - int ret = 0, count = 0;
> -
> - mutex_lock(&opp_table_lock);
> -
> - opp_table = _managed_opp(opp_np);
> - if (opp_table) {
> - /* OPPs are already managed */
> - if (!_add_opp_dev(dev, opp_table))
> - ret = -ENOMEM;
> - mutex_unlock(&opp_table_lock);
> - return ret;
> - }
> - mutex_unlock(&opp_table_lock);
> -
> - /* We have opp-table node now, iterate over it and add OPPs */
> - for_each_available_child_of_node(opp_np, np) {
> - count++;
> -
> - ret = _opp_add_static_v2(dev, np);
> - if (ret) {
> - dev_err(dev, "%s: Failed to add OPP, %d\n", __func__,
> - ret);
> - goto free_table;
> - }
> - }
> -
> - /* There should be one of more OPP defined */
> - if (WARN_ON(!count))
> - return -ENOENT;
> -
> - mutex_lock(&opp_table_lock);
> -
> - opp_table = _find_opp_table(dev);
> - if (WARN_ON(IS_ERR(opp_table))) {
> - ret = PTR_ERR(opp_table);
> - mutex_unlock(&opp_table_lock);
> - goto free_table;
> - }
> -
> - opp_table->np = opp_np;
> - opp_table->shared_opp = of_property_read_bool(opp_np, "opp-shared");
> -
> - mutex_unlock(&opp_table_lock);
> -
> - return 0;
> -
> -free_table:
> - dev_pm_opp_of_remove_table(dev);
> -
> - return ret;
> -}
> -
> -/* Initializes OPP tables based on old-deprecated bindings */
> -static int _of_add_opp_table_v1(struct device *dev)
> -{
> - const struct property *prop;
> - const __be32 *val;
> - int nr;
> -
> - prop = of_find_property(dev->of_node, "operating-points", NULL);
> - if (!prop)
> - return -ENODEV;
> - if (!prop->value)
> - return -ENODATA;
> -
> - /*
> - * 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__);
> - return -EINVAL;
> - }
> -
> - val = prop->value;
> - while (nr) {
> - unsigned long freq = be32_to_cpup(val++) * 1000;
> - unsigned long volt = be32_to_cpup(val++);
> -
> - if (_opp_add_v1(dev, freq, volt, false))
> - dev_warn(dev, "%s: Failed to add OPP %ld\n",
> - __func__, freq);
> - nr -= 2;
> - }
> -
> - return 0;
> -}
> -
> -/**
> - * 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.
> - *
> - * Locking: The internal opp_table and opp structures are RCU protected.
> - * Hence this function indirectly uses RCU updater strategy with mutex locks
> - * to keep the integrity of the internal data structures. Callers should ensure
> - * that this function is *NOT* called under RCU protection or in contexts where
> - * mutex cannot be locked.
> - *
> - * 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)
> -{
> - struct device_node *opp_np;
> - int ret;
> -
> - /*
> - * OPPs have two version of bindings now. The older one is deprecated,
> - * try for the new binding first.
> - */
> - opp_np = _of_get_opp_desc_node(dev);
> - if (!opp_np) {
> - /*
> - * Try old-deprecated bindings for backward compatibility with
> - * older dtbs.
> - */
> - return _of_add_opp_table_v1(dev);
> - }
> -
> - ret = _of_add_opp_table_v2(dev, opp_np);
> - of_node_put(opp_np);
> -
> - return ret;
> -}
> -EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table);
> -#endif
> diff --git a/drivers/base/power/opp/cpu.c b/drivers/base/power/opp/cpu.c
> index 357781e0b791..83d6e7ba1a34 100644
> --- a/drivers/base/power/opp/cpu.c
> +++ b/drivers/base/power/opp/cpu.c
> @@ -18,7 +18,6 @@
> #include <linux/err.h>
> #include <linux/errno.h>
> #include <linux/export.h>
> -#include <linux/of.h>
> #include <linux/slab.h>
>
> #include "opp.h"
> @@ -119,8 +118,7 @@ void dev_pm_opp_free_cpufreq_table(struct device *dev,
> EXPORT_SYMBOL_GPL(dev_pm_opp_free_cpufreq_table);
> #endif /* CONFIG_CPU_FREQ */
>
> -static void
> -_dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, bool of)
> +void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, bool of)
> {
> struct device *cpu_dev;
> int cpu;
> @@ -162,145 +160,6 @@ void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask)
> }
> EXPORT_SYMBOL_GPL(dev_pm_opp_cpumask_remove_table);
>
> -#ifdef CONFIG_OF
> -/**
> - * 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.
> - *
> - * Locking: The internal opp_table and opp structures are RCU protected.
> - * Hence this function internally uses RCU updater strategy with mutex locks
> - * to keep the integrity of the internal data structures. Callers should ensure
> - * that this function is *NOT* called under RCU protection or in contexts where
> - * mutex cannot be locked.
> - */
> -void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask)
> -{
> - _dev_pm_opp_cpumask_remove_table(cpumask, true);
> -}
> -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.
> - *
> - * Locking: The internal opp_table and opp structures are RCU protected.
> - * Hence this function internally uses RCU updater strategy with mutex locks
> - * to keep the integrity of the internal data structures. Callers should ensure
> - * that this function is *NOT* called under RCU protection or in contexts where
> - * mutex cannot be locked.
> - */
> -int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask)
> -{
> - struct device *cpu_dev;
> - int cpu, ret = 0;
> -
> - WARN_ON(cpumask_empty(cpumask));
> -
> - 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);
> - continue;
> - }
> -
> - ret = dev_pm_opp_of_add_table(cpu_dev);
> - if (ret) {
> - pr_err("%s: couldn't find opp table for cpu:%d, %d\n",
> - __func__, cpu, ret);
> -
> - /* Free all other OPPs */
> - dev_pm_opp_of_cpumask_remove_table(cpumask);
> - break;
> - }
> - }
> -
> - 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.
> - *
> - * Locking: The internal opp_table and opp structures are RCU protected.
> - * Hence this function internally uses RCU updater strategy with mutex locks
> - * to keep the integrity of the internal data structures. Callers should ensure
> - * that this function is *NOT* called under RCU protection or in contexts where
> - * mutex cannot be locked.
> - */
> -int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
> -{
> - struct device_node *np, *tmp_np;
> - struct device *tcpu_dev;
> - int cpu, ret = 0;
> -
> - /* Get OPP descriptor node */
> - np = _of_get_opp_desc_node(cpu_dev);
> - if (!np) {
> - dev_dbg(cpu_dev, "%s: Couldn't find cpu_dev 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;
> -
> - tcpu_dev = get_cpu_device(cpu);
> - if (!tcpu_dev) {
> - dev_err(cpu_dev, "%s: failed to get cpu%d device\n",
> - __func__, cpu);
> - ret = -ENODEV;
> - goto put_cpu_node;
> - }
> -
> - /* Get OPP descriptor node */
> - tmp_np = _of_get_opp_desc_node(tcpu_dev);
> - if (!tmp_np) {
> - dev_err(tcpu_dev, "%s: Couldn't find tcpu_dev node.\n",
> - __func__);
> - 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);
> -#endif
> -
> /**
> * dev_pm_opp_set_sharing_cpus() - Mark OPP table as shared by few CPUs
> * @cpu_dev: CPU device for which we do this operation
> diff --git a/drivers/base/power/opp/of.c b/drivers/base/power/opp/of.c
> new file mode 100644
> index 000000000000..94d2010558e3
> --- /dev/null
> +++ b/drivers/base/power/opp/of.c
> @@ -0,0 +1,591 @@
> +/*
> + * Generic OPP OF helpers
> + *
> + * Copyright (C) 2009-2010 Texas Instruments Incorporated.
> + * Nishanth Menon
> + * Romit Dasgupta
> + * Kevin Hilman
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#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/export.h>
> +
> +#include "opp.h"
> +
> +static struct opp_table *_managed_opp(const struct device_node *np)
> +{
> + struct opp_table *opp_table;
> +
> + list_for_each_entry_rcu(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.
> + */
> + return opp_table->shared_opp ? opp_table : NULL;
> + }
> + }
> +
> + return NULL;
> +}
> +
> +void _of_init_opp_table(struct opp_table *opp_table, struct device *dev)
> +{
> + struct device_node *np;
> +
> + /*
> + * 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) {
> + u32 val;
> +
> + 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);
> + of_node_put(np);
> + }
> +}
> +
> +static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table,
> + struct device_node *np)
> +{
> + unsigned int count = opp_table->supported_hw_count;
> + u32 version;
> + int ret;
> +
> + if (!opp_table->supported_hw)
> + return true;
> +
> + while (count--) {
> + ret = of_property_read_u32_index(np, "opp-supported-hw", count,
> + &version);
> + if (ret) {
> + dev_warn(dev, "%s: failed to read opp-supported-hw property at index %d: %d\n",
> + __func__, count, ret);
> + return false;
> + }
> +
> + /* Both of these are bitwise masks of the versions */
> + if (!(version & opp_table->supported_hw[count]))
> + return false;
> + }
> +
> + return true;
> +}
> +
> +/* TODO: Support multiple regulators */
> +static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev,
> + struct opp_table *opp_table)
> +{
> + u32 microvolt[3] = {0};
> + u32 val;
> + int count, ret;
> + struct property *prop = NULL;
> + char name[NAME_MAX];
> +
> + /* Search for "opp-microvolt-<name>" */
> + if (opp_table->prop_name) {
> + snprintf(name, sizeof(name), "opp-microvolt-%s",
> + opp_table->prop_name);
> + prop = of_find_property(opp->np, name, NULL);
> + }
> +
> + if (!prop) {
> + /* Search for "opp-microvolt" */
> + sprintf(name, "opp-microvolt");
> + prop = of_find_property(opp->np, name, NULL);
> +
> + /* Missing property isn't a problem, but an invalid entry is */
> + if (!prop)
> + return 0;
> + }
> +
> + 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 count;
> + }
> +
> + /* There can be one or three elements here */
> + if (count != 1 && count != 3) {
> + dev_err(dev, "%s: Invalid number of elements in %s property (%d)\n",
> + __func__, name, count);
> + return -EINVAL;
> + }
> +
> + ret = of_property_read_u32_array(opp->np, name, microvolt, count);
> + if (ret) {
> + dev_err(dev, "%s: error parsing %s: %d\n", __func__, name, ret);
> + return -EINVAL;
> + }
> +
> + opp->u_volt = microvolt[0];
> +
> + if (count == 1) {
> + opp->u_volt_min = opp->u_volt;
> + opp->u_volt_max = opp->u_volt;
> + } else {
> + opp->u_volt_min = microvolt[1];
> + opp->u_volt_max = microvolt[2];
> + }
> +
> + /* Search for "opp-microamp-<name>" */
> + prop = NULL;
> + if (opp_table->prop_name) {
> + snprintf(name, sizeof(name), "opp-microamp-%s",
> + opp_table->prop_name);
> + prop = of_find_property(opp->np, name, NULL);
> + }
> +
> + if (!prop) {
> + /* Search for "opp-microamp" */
> + sprintf(name, "opp-microamp");
> + prop = of_find_property(opp->np, name, NULL);
> + }
> +
> + if (prop && !of_property_read_u32(opp->np, name, &val))
> + opp->u_amp = val;
> +
> + return 0;
> +}
> +
> +/**
> + * 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.
> + *
> + * Locking: The internal opp_table and opp structures are RCU protected.
> + * Hence this function indirectly uses RCU updater strategy with mutex locks
> + * to keep the integrity of the internal data structures. Callers should ensure
> + * that this function is *NOT* called under RCU protection or in contexts where
> + * mutex cannot be locked.
> + */
> +void dev_pm_opp_of_remove_table(struct device *dev)
> +{
> + _dev_pm_opp_remove_table(dev, false);
> +}
> +EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table);
> +
> +/* Returns opp descriptor node for a device, caller must do of_node_put() */
> +struct device_node *_of_get_opp_desc_node(struct device *dev)
> +{
> + /*
> + * TODO: Support for multiple OPP tables.
> + *
> + * There should be only ONE phandle present in "operating-points-v2"
> + * property.
> + */
> +
> + return of_parse_phandle(dev->of_node, "operating-points-v2", 0);
> +}
> +
> +/**
> + * _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings)
> + * @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.
> + *
> + * Locking: The internal opp_table and opp structures are RCU protected.
> + * Hence this function internally uses RCU updater strategy with mutex locks
> + * to keep the integrity of the internal data structures. Callers should ensure
> + * that this function is *NOT* called under RCU protection or in contexts where
> + * mutex cannot be locked.
> + *
> + * 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
> + * -EINVAL Failed parsing the OPP node
> + */
> +static int _opp_add_static_v2(struct device *dev, struct device_node *np)
> +{
> + struct opp_table *opp_table;
> + struct dev_pm_opp *new_opp;
> + u64 rate;
> + u32 val;
> + int ret;
> +
> + /* Hold our table modification lock here */
> + mutex_lock(&opp_table_lock);
> +
> + new_opp = _allocate_opp(dev, &opp_table);
> + if (!new_opp) {
> + ret = -ENOMEM;
> + goto unlock;
> + }
> +
> + ret = of_property_read_u64(np, "opp-hz", &rate);
> + if (ret < 0) {
> + dev_err(dev, "%s: opp-hz 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: %llu\n", rate);
> + goto free_opp;
> + }
> +
> + /*
> + * 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.
> + */
> + new_opp->rate = (unsigned long)rate;
> + new_opp->turbo = of_property_read_bool(np, "turbo-mode");
> +
> + new_opp->np = np;
> + new_opp->dynamic = false;
> + new_opp->available = true;
> +
> + 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_opp;
> +
> + ret = _opp_add(dev, new_opp, opp_table);
> + if (ret)
> + goto free_opp;
> +
> + /* OPP to select on device suspend */
> + if (of_property_read_bool(np, "opp-suspend")) {
> + if (opp_table->suspend_opp) {
> + dev_warn(dev, "%s: Multiple suspend OPPs found (%lu %lu)\n",
> + __func__, opp_table->suspend_opp->rate,
> + new_opp->rate);
> + } 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;
> +
> + mutex_unlock(&opp_table_lock);
> +
> + pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n",
> + __func__, new_opp->turbo, new_opp->rate, new_opp->u_volt,
> + new_opp->u_volt_min, new_opp->u_volt_max,
> + new_opp->clock_latency_ns);
> +
> + /*
> + * Notify the changes in the availability of the operable
> + * frequency/voltage list.
> + */
> + srcu_notifier_call_chain(&opp_table->srcu_head, OPP_EVENT_ADD, new_opp);
> + return 0;
> +
> +free_opp:
> + _opp_remove(opp_table, new_opp, false);
> +unlock:
> + mutex_unlock(&opp_table_lock);
> + return ret;
> +}
> +
> +/* Initializes OPP tables based on new bindings */
> +static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np)
> +{
> + struct device_node *np;
> + struct opp_table *opp_table;
> + int ret = 0, count = 0;
> +
> + mutex_lock(&opp_table_lock);
> +
> + opp_table = _managed_opp(opp_np);
> + if (opp_table) {
> + /* OPPs are already managed */
> + if (!_add_opp_dev(dev, opp_table))
> + ret = -ENOMEM;
> + mutex_unlock(&opp_table_lock);
> + return ret;
> + }
> + mutex_unlock(&opp_table_lock);
> +
> + /* We have opp-table node now, iterate over it and add OPPs */
> + for_each_available_child_of_node(opp_np, np) {
> + count++;
> +
> + ret = _opp_add_static_v2(dev, np);
> + if (ret) {
> + dev_err(dev, "%s: Failed to add OPP, %d\n", __func__,
> + ret);
> + goto free_table;
> + }
> + }
> +
> + /* There should be one of more OPP defined */
> + if (WARN_ON(!count))
> + return -ENOENT;
> +
> + mutex_lock(&opp_table_lock);
> +
> + opp_table = _find_opp_table(dev);
> + if (WARN_ON(IS_ERR(opp_table))) {
> + ret = PTR_ERR(opp_table);
> + mutex_unlock(&opp_table_lock);
> + goto free_table;
> + }
> +
> + opp_table->np = opp_np;
> + opp_table->shared_opp = of_property_read_bool(opp_np, "opp-shared");
> +
> + mutex_unlock(&opp_table_lock);
> +
> + return 0;
> +
> +free_table:
> + dev_pm_opp_of_remove_table(dev);
> +
> + return ret;
> +}
> +
> +/* Initializes OPP tables based on old-deprecated bindings */
> +static int _of_add_opp_table_v1(struct device *dev)
> +{
> + const struct property *prop;
> + const __be32 *val;
> + int nr;
> +
> + prop = of_find_property(dev->of_node, "operating-points", NULL);
> + if (!prop)
> + return -ENODEV;
> + if (!prop->value)
> + return -ENODATA;
> +
> + /*
> + * 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__);
> + return -EINVAL;
> + }
> +
> + val = prop->value;
> + while (nr) {
> + unsigned long freq = be32_to_cpup(val++) * 1000;
> + unsigned long volt = be32_to_cpup(val++);
> +
> + if (_opp_add_v1(dev, freq, volt, false))
> + dev_warn(dev, "%s: Failed to add OPP %ld\n",
> + __func__, freq);
> + nr -= 2;
> + }
> +
> + return 0;
> +}
> +
> +/**
> + * 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.
> + *
> + * Locking: The internal opp_table and opp structures are RCU protected.
> + * Hence this function indirectly uses RCU updater strategy with mutex locks
> + * to keep the integrity of the internal data structures. Callers should ensure
> + * that this function is *NOT* called under RCU protection or in contexts where
> + * mutex cannot be locked.
> + *
> + * 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)
> +{
> + struct device_node *opp_np;
> + int ret;
> +
> + /*
> + * OPPs have two version of bindings now. The older one is deprecated,
> + * try for the new binding first.
> + */
> + opp_np = _of_get_opp_desc_node(dev);
> + if (!opp_np) {
> + /*
> + * Try old-deprecated bindings for backward compatibility with
> + * older dtbs.
> + */
> + return _of_add_opp_table_v1(dev);
> + }
> +
> + ret = _of_add_opp_table_v2(dev, opp_np);
> + of_node_put(opp_np);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table);
> +
> +/* 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.
> + *
> + * Locking: The internal opp_table and opp structures are RCU protected.
> + * Hence this function internally uses RCU updater strategy with mutex locks
> + * to keep the integrity of the internal data structures. Callers should ensure
> + * that this function is *NOT* called under RCU protection or in contexts where
> + * mutex cannot be locked.
> + */
> +void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask)
> +{
> + _dev_pm_opp_cpumask_remove_table(cpumask, true);
> +}
> +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.
> + *
> + * Locking: The internal opp_table and opp structures are RCU protected.
> + * Hence this function internally uses RCU updater strategy with mutex locks
> + * to keep the integrity of the internal data structures. Callers should ensure
> + * that this function is *NOT* called under RCU protection or in contexts where
> + * mutex cannot be locked.
> + */
> +int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask)
> +{
> + struct device *cpu_dev;
> + int cpu, ret = 0;
> +
> + WARN_ON(cpumask_empty(cpumask));
> +
> + 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);
> + continue;
> + }
> +
> + ret = dev_pm_opp_of_add_table(cpu_dev);
> + if (ret) {
> + pr_err("%s: couldn't find opp table for cpu:%d, %d\n",
> + __func__, cpu, ret);
> +
> + /* Free all other OPPs */
> + dev_pm_opp_of_cpumask_remove_table(cpumask);
> + break;
> + }
> + }
> +
> + 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.
> + *
> + * Locking: The internal opp_table and opp structures are RCU protected.
> + * Hence this function internally uses RCU updater strategy with mutex locks
> + * to keep the integrity of the internal data structures. Callers should ensure
> + * that this function is *NOT* called under RCU protection or in contexts where
> + * mutex cannot be locked.
> + */
> +int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev,
> + struct cpumask *cpumask)
> +{
> + struct device_node *np, *tmp_np;
> + struct device *tcpu_dev;
> + int cpu, ret = 0;
> +
> + /* Get OPP descriptor node */
> + np = _of_get_opp_desc_node(cpu_dev);
> + if (!np) {
> + dev_dbg(cpu_dev, "%s: Couldn't find cpu_dev 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;
> +
> + tcpu_dev = get_cpu_device(cpu);
> + if (!tcpu_dev) {
> + dev_err(cpu_dev, "%s: failed to get cpu%d device\n",
> + __func__, cpu);
> + ret = -ENODEV;
> + goto put_cpu_node;
> + }
> +
> + /* Get OPP descriptor node */
> + tmp_np = _of_get_opp_desc_node(tcpu_dev);
> + if (!tmp_np) {
> + dev_err(tcpu_dev, "%s: Couldn't find tcpu_dev node.\n",
> + __func__);
> + 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);
> diff --git a/drivers/base/power/opp/opp.h b/drivers/base/power/opp/opp.h
> index f67f806fcf3a..20f3be22e060 100644
> --- a/drivers/base/power/opp/opp.h
> +++ b/drivers/base/power/opp/opp.h
> @@ -28,6 +28,8 @@ 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;
> +
> /*
> * Internal data structure organization with the OPP layer library is as
> * follows:
> @@ -183,6 +185,18 @@ struct 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 device_node *_of_get_opp_desc_node(struct device *dev);
> +void _dev_pm_opp_remove_table(struct device *dev, bool remove_all);
> +struct dev_pm_opp *_allocate_opp(struct device *dev, struct opp_table **opp_table);
> +int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, struct opp_table *opp_table);
> +void _opp_remove(struct opp_table *opp_table, struct dev_pm_opp *opp, bool notify);
> +int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt, bool dynamic);
> +void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, bool of);
> +
> +#ifdef CONFIG_OF
> +void _of_init_opp_table(struct opp_table *opp_table, struct device *dev);
> +#else
> +static inline void _of_init_opp_table(struct opp_table *opp_table, struct device *dev) {}
> +#endif
>
> #ifdef CONFIG_DEBUG_FS
> void opp_debug_remove_one(struct dev_pm_opp *opp);
>
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