Commit a8a97db9 authored by Mark Brown's avatar Mark Brown Committed by Russell King

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: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent e816b57a
......@@ -276,3 +276,7 @@ REGULATOR
devm_regulator_get()
devm_regulator_put()
devm_regulator_bulk_get()
CLOCK
devm_clk_get()
devm_clk_put()
......@@ -89,6 +89,51 @@ void clk_put(struct clk *clk)
}
EXPORT_SYMBOL(clk_put);
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);
static int devm_clk_match(struct device *dev, void *res, void *data)
{
struct clk **c = res;
if (!c || !*c) {
WARN_ON(!c || !*c);
return 0;
}
return *c == data;
}
void devm_clk_put(struct device *dev, struct clk *clk)
{
int ret;
ret = devres_destroy(dev, devm_clk_release, devm_clk_match, clk);
WARN_ON(ret);
}
EXPORT_SYMBOL(devm_clk_put);
void clkdev_add(struct clk_lookup *cl)
{
mutex_lock(&clocks_mutex);
......
......@@ -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.
......
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