From a8a97db984bdc5e89d42e41891543d2daaf314cb Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Thu, 5 Apr 2012 11:42:09 +0100 Subject: ARM: 7376/1: clkdev: Implement managed clk_get() Allow clk API users to simplify their cleanup paths by providing a managed version of clk_get() and clk_put(). Signed-off-by: Mark Brown Signed-off-by: Russell King --- include/linux/clk.h | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) (limited to 'include/linux/clk.h') diff --git a/include/linux/clk.h b/include/linux/clk.h index b0252726df61..70cf722ac3af 100644 --- a/include/linux/clk.h +++ b/include/linux/clk.h @@ -100,6 +100,26 @@ int clk_notifier_unregister(struct clk *clk, struct notifier_block *nb); */ struct clk *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" + * @id: clock comsumer ID + * + * Returns a struct clk corresponding to the clock producer, or + * valid IS_ERR() condition containing errno. The implementation + * uses @dev and @id to determine the clock consumer, and thereby + * the clock producer. (IOW, @id may be identical strings, but + * clk_get may return different clock producers depending on @dev.) + * + * Drivers must assume that the clock source is not enabled. + * + * devm_clk_get should not be called from within interrupt context. + * + * The clock will automatically be freed when the device is unbound + * from the bus. + */ +struct clk *devm_clk_get(struct device *dev, const char *id); + /** * clk_prepare - prepare a clock source * @clk: clock source @@ -206,6 +226,18 @@ unsigned long clk_get_rate(struct clk *clk); */ void clk_put(struct clk *clk); +/** + * devm_clk_put - "free" a managed clock source + * @dev: device used to acuqire the clock + * @clk: clock source acquired with devm_clk_get() + * + * Note: drivers must ensure that all clk_enable calls made on this + * clock source are balanced by clk_disable calls prior to calling + * this function. + * + * clk_put should not be called from within interrupt context. + */ +void devm_clk_put(struct device *dev, struct clk *clk); /* * The remaining APIs are optional for machine class support. -- cgit v1.2.3-59-g8ed1b