[PATCH 01/31] opp: Add devres wrapper for dev_pm_opp_set_clkname and dev_pm_opp_put_clkname

Yangtao Li
2021-01-01T16:56:36Z

Add devres wrapper for dev_pm_opp_set_clkname() and
dev_pm_opp_put_clkname() to simplify driver code.

Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
---
drivers/opp/core.c | 47 ++++++++++++++++++++++++++++++++++++++++++
include/linux/pm_opp.h | 9 ++++++++
2 files changed, 56 insertions(+)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 4268eb359915..53fdf33732d5 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -1948,6 +1948,53 @@ void dev_pm_opp_put_clkname(struct opp_table *opp_table)
}
EXPORT_SYMBOL_GPL(dev_pm_opp_put_clkname);

+static void devm_pm_opp_clkname_release(void *data)
+{
+ dev_pm_opp_put_clkname(data);
+}
+
+/**
+ * devm_pm_opp_set_clkname() - Set clk name for the device
+ * @dev: Device for which clk name is being set.
+ * @name: Clk name.
+ *
+ * In order to support OPP switching, OPP layer needs to get pointer to the
+ * clock 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 name of the clk to use.
+ *
+ * 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_clkname(struct device *dev, const char *name)
+{
+ struct opp_table *opp_table;
+ int err;
+
+ opp_table = dev_pm_opp_set_clkname(dev, name);
+ if (IS_ERR(opp_table))
+ return opp_table;
+
+ err = devm_add_action_or_reset(dev, devm_pm_opp_clkname_release, opp_table);
+ if (err)
+ opp_table = ERR_PTR(err);
+
+ return opp_table;
+}
+EXPORT_SYMBOL_GPL(devm_pm_opp_set_clkname);
+
+/**
+ * devm_pm_opp_put_clkname() - Releases resources blocked for clk.
+ * @dev: Device for which we do this operation.
+ * @opp_table: OPP table returned from devm_pm_opp_set_clkname().
+ */
+void devm_pm_opp_put_clkname(struct device *dev, struct opp_table *opp_table)
+{
+ devm_release_action(dev, devm_pm_opp_clkname_release, opp_table);
+}
+EXPORT_SYMBOL_GPL(devm_pm_opp_put_clkname);
+
/**
* dev_pm_opp_register_set_opp_helper() - Register custom set OPP helper
* @dev: Device for which the helper is getting registered.
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index 1435c054016a..3418a2874f88 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -145,6 +145,8 @@ struct opp_table *dev_pm_opp_set_regulators(struct device *dev, const char * con
void dev_pm_opp_put_regulators(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);
+void devm_pm_opp_put_clkname(struct device *dev, struct opp_table *opp_table);
struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev, int (*set_opp)(struct dev_pm_set_opp_data *data));
void dev_pm_opp_unregister_set_opp_helper(struct opp_table *opp_table);
struct opp_table *dev_pm_opp_attach_genpd(struct device *dev, const char **names, struct device ***virt_devs);
@@ -326,6 +328,13 @@ static inline struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const

static inline void dev_pm_opp_put_clkname(struct opp_table *opp_table) {}

+static inline struct opp_table *devm_pm_opp_set_clkname(struct device *dev, const char *name)
+{
+ return ERR_PTR(-ENOTSUPP);
+}
+
+static inline void devm_pm_opp_put_clkname(struct device *dev, struct opp_table *opp_table) {}
+
static inline struct opp_table *dev_pm_opp_attach_genpd(struct device *dev, const char **names, struct device ***virt_devs)
{
return ERR_PTR(-ENOTSUPP);
--
2.25.1