[PATCH 02/31] opp: Add devres wrapper for dev_pm_opp_set_regulators and dev_pm_opp_put_regulators

[Yangtao Li]

Add devres wrapper for dev_pm_opp_set_regulators()
dev_pm_opp_put_regulators () to simplify driver code.

Signed-off-by: Yangtao Li <tiny.windzz at gmail.com>
---
 drivers/opp/core.c     | 50 ++++++++++++++++++++++++++++++++++++++++++
 include/linux/pm_opp.h |  9 ++++++++
 2 files changed, 59 insertions(+)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 53fdf33732d5..8709689a7152 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -1878,6 +1878,56 @@ 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);
+
+/**
+ * devm_pm_opp_put_regulators() - Releases resources blocked for regulator
+ * @dev: Device for which we do this operation.
+ * @opp_table: OPP table returned from dev_pm_opp_set_regulators().
+ */
+void devm_pm_opp_put_regulators(struct device *dev, struct opp_table *opp_table)
+{
+	devm_release_action(dev, devm_pm_opp_regulators_release, opp_table);
+}
+EXPORT_SYMBOL_GPL(devm_pm_opp_put_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 3418a2874f88..8a329247e08e 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -143,6 +143,8 @@ 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);
+void devm_pm_opp_put_regulators(struct device *dev, struct opp_table *opp_table);
 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);
@@ -321,6 +323,13 @@ 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(-ENOTSUPP);
+}
+
+static inline void devm_pm_opp_put_regulators(struct device *dev, struct opp_table *opp_table) {}
+
 static inline struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char * name)
 {
 	return ERR_PTR(-ENOTSUPP);
-- 
2.25.1