[PATCH v2 02/14] opp: Add devres wrapper for dev_pm_opp_set_regulators

[Dmitry Osipenko <digetx@gmail.com>]

From: Yangtao Li <tiny.windzz@gmail.com>

Add devres wrapper for dev_pm_opp_set_regulators() to simplify drivers
code.

Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/opp/core.c     | 39 +++++++++++++++++++++++++++++++++++++++
 include/linux/pm_opp.h |  8 ++++++++
 2 files changed, 47 insertions(+)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 3345ab8da6b2..32fa2bff847b 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -2047,6 +2047,45 @@ void dev_pm_opp_put_regulators(struct opp_table *opp_table)
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulators);
 
+static void devm_pm_opp_regulators_release(void *data)
+{
+	dev_pm_opp_put_regulators(data);
+}
+
+/**
+ * devm_pm_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.
+ *
+ * The opp_table structure will be freed after the device is destroyed.
+ */
+struct opp_table *devm_pm_opp_set_regulators(struct device *dev,
+					     const char * const names[],
+					     unsigned int count)
+{
+	struct opp_table *opp_table;
+	int err;
+
+	opp_table = dev_pm_opp_set_regulators(dev, names, count);
+	if (IS_ERR(opp_table))
+		return opp_table;
+
+	err = devm_add_action_or_reset(dev, devm_pm_opp_regulators_release,
+				       opp_table);
+	if (err)
+		opp_table = ERR_PTR(err);
+
+	return opp_table;
+}
+EXPORT_SYMBOL_GPL(devm_pm_opp_set_regulators);
+
 /**
  * dev_pm_opp_set_clkname() - Set clk name for the device
  * @dev: Device for which clk name is being set.
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index 6fb992168f1e..284d23665b15 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -148,6 +148,7 @@ struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name)
 void dev_pm_opp_put_prop_name(struct opp_table *opp_table);
 struct opp_table *dev_pm_opp_set_regulators(struct device *dev, const char * const names[], unsigned int count);
 void dev_pm_opp_put_regulators(struct opp_table *opp_table);
+struct opp_table *devm_pm_opp_set_regulators(struct device *dev, const char * const names[], unsigned int count);
 struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char *name);
 void dev_pm_opp_put_clkname(struct opp_table *opp_table);
 struct opp_table *devm_pm_opp_set_clkname(struct device *dev, const char *name);
@@ -349,6 +350,13 @@ static inline struct opp_table *dev_pm_opp_set_regulators(struct device *dev, co
 
 static inline void dev_pm_opp_put_regulators(struct opp_table *opp_table) {}
 
+static inline struct opp_table *devm_pm_opp_set_regulators(struct device *dev,
+							   const char * const names[],
+							   unsigned int count)
+{
+	return ERR_PTR(-EOPNOTSUPP);
+}
+
 static inline struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char *name)
 {
 	return ERR_PTR(-EOPNOTSUPP);
-- 
2.29.2