From: Kuninori Morimoto kuninori.morimoto.gx@renesas.com
Current Linux has of_clk_get(), but doesn't have devm_of_clk_get(). This patch adds it. It is implemeted in clk-devres.c to share devm_clk_release().
Signed-off-by: Kuninori Morimoto kuninori.morimoto.gx@renesas.com --- v3 -> v4
- git log explain why it is implemeted in clk-devres - it is related to CONFIG_HAVE_CLK
drivers/clk/clk-devres.c | 21 +++++++++++++++++++++ include/linux/clk.h | 27 +++++++++++++++++++++++---- 2 files changed, 44 insertions(+), 4 deletions(-)
diff --git a/drivers/clk/clk-devres.c b/drivers/clk/clk-devres.c index 8f57154..2449b25 100644 --- a/drivers/clk/clk-devres.c +++ b/drivers/clk/clk-devres.c @@ -53,3 +53,24 @@ void devm_clk_put(struct device *dev, struct clk *clk) WARN_ON(ret); } EXPORT_SYMBOL(devm_clk_put); + +struct clk *devm_of_clk_get(struct device *dev, + struct device_node *np, int index) +{ + struct clk **ptr, *clk; + + ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return ERR_PTR(-ENOMEM); + + clk = of_clk_get(np, index); + if (!IS_ERR(clk)) { + *ptr = clk; + devres_add(dev, ptr); + } else { + devres_free(ptr); + } + + return clk; +} +EXPORT_SYMBOL(devm_of_clk_get); diff --git a/include/linux/clk.h b/include/linux/clk.h index 123c027..7f50c5f 100644 --- a/include/linux/clk.h +++ b/include/linux/clk.h @@ -17,8 +17,9 @@ #include <linux/notifier.h>
struct device; - struct clk; +struct device_node; +struct of_phandle_args;
/** * DOC: clk notifier callback types @@ -249,6 +250,21 @@ static inline void clk_unprepare(struct clk *clk) struct clk *devm_clk_get(struct device *dev, const char *id);
/** + * devm_clk_get - lookup and obtain a managed reference to a clock producer. + * @dev: device for clock "consumer" + * @np: pointer to clock consumer node + * @index: clock index + * + * This function parses the clocks, and uses them to look up the + * struct clk from the registered list of clock providers by using + * @np and @index. + * + * The clock will automatically be freed when the device is unbound + * from the bus. + */ +struct clk *devm_of_clk_get(struct device *dev, struct device_node *np, int index); + +/** * clk_enable - inform the system when the clock source should be running. * @clk: clock source * @@ -432,6 +448,12 @@ static inline struct clk *devm_clk_get(struct device *dev, const char *id) return NULL; }
+static inline struct clk *devm_of_clk_get(struct device *dev, + struct device_node *np, int index) +{ + return NULL; +} + static inline void clk_put(struct clk *clk) {}
static inline void devm_clk_put(struct device *dev, struct clk *clk) {} @@ -501,9 +523,6 @@ static inline void clk_disable_unprepare(struct clk *clk) clk_unprepare(clk); }
-struct device_node; -struct of_phandle_args; - #if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK) struct clk *of_clk_get(struct device_node *np, int index); struct clk *of_clk_get_by_name(struct device_node *np, const char *name);