Piteball/android_kernel_google_msm
1
0
Fork 0
mirror of https://github.com/followmsi/android_kernel_google_msm.git synced 2024-11-06 23:17:41 +00:00
Code Issues Projects Releases Wiki Activity

clk: Add devm_clk_get()

Browse source 
Add a resource managed clk_get() to simplify clock usage in
drivers. This allows driver authors to "get and forget" about
their clocks by automatically calling clk_put() when the driver
is detached. This also encourages clock consumers to use the
clk_get() API correctly by passing in a struct device as an
argument.

Change-Id: I1ed53cd3c26c0390fa30cd3c3dca14bcdd59939f
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Stephen Boyd 2012-03-23 15:21:12 -07:00
parent 3924a3e96e
commit 64990c839b
2 changed files with 35 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

25
drivers/clk/clkdev.c
View file

@ -83,6 +83,31 @@ struct clk *clk_get(struct device *dev, const char *con_id)
}
EXPORT_SYMBOL(clk_get);
static void devm_clk_release(struct device *dev, void *res)
{
clk_put(*(struct clk **)res);
}
struct clk *devm_clk_get(struct device *dev, const char *id)
{
struct clk **ptr, *clk;
ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL);
if (!ptr)
return ERR_PTR(-ENOMEM);
clk = clk_get(dev, id);
if (!IS_ERR(clk)) {
*ptr = clk;
devres_add(dev, ptr);
} else {
devres_free(ptr);
}
return clk;
}
EXPORT_SYMBOL(devm_clk_get);
void clk_put(struct clk *clk)
{
__clk_put(clk);

10
include/linux/clk.h
View file

@ -100,6 +100,16 @@ int clk_notifier_unregister(struct clk *clk, struct notifier_block *nb);
*/
struct clk *clk_get(struct device *dev, const char *id);
/**
* devm_clk_get - Resource managed clk_get()
* @dev: device for clk "consumer"
* @id: clk ID.
*
* Managed clk_get(). Clocks returned from this function are
* automatically clk_put() on driver detach.
*/
struct clk *devm_clk_get(struct device *dev, const char *id);
/**
* clk_prepare - prepare a clock source
* @clk: clock source