|author||Mark Brown <firstname.lastname@example.org>||2012-04-05 11:42:09 +0100|
|committer||Simone Willett <email@example.com>||2012-05-17 13:45:55 -0700|
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 <firstname.lastname@example.org> Signed-off-by: Russell King <email@example.com> Cherry-picked from mainline a8a97db984bdc5e89d42e41891543d2daaf314cb Change-Id: Ib36c0c82063928937166b6014fca92025bc83878 Signed-off-by: Laxman Dewangan <firstname.lastname@example.org> Reviewed-on: http://git-master/r/102860 Reviewed-by: Automatic_Commit_Validation_User Reviewed-by: Stephen Warren <email@example.com>
Diffstat (limited to 'include')
1 files changed, 32 insertions, 0 deletions
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 1d37f42ac294..59b428e5fbc5 100644
@@ -41,6 +41,26 @@ struct clk;
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_enable - inform the system when the clock source should be running.
* @clk: clock source
@@ -83,6 +103,18 @@ 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.