提交 3d6ee287 编写于 作者: U Ulf Hansson 提交者: Mike Turquette

clk: Introduce optional is_prepared callback

To reflect whether a clk_hw is prepared the clk_hw may implement
the optional is_prepared callback. If not implemented we fall back
to use the software prepare counter.
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NMike Turquette <mturquette@linaro.org>
上级 30ee4006
......@@ -451,6 +451,27 @@ unsigned long __clk_get_flags(struct clk *clk)
return !clk ? 0 : clk->flags;
}
bool __clk_is_prepared(struct clk *clk)
{
int ret;
if (!clk)
return false;
/*
* .is_prepared is optional for clocks that can prepare
* fall back to software usage counter if it is missing
*/
if (!clk->ops->is_prepared) {
ret = clk->prepare_count ? 1 : 0;
goto out;
}
ret = clk->ops->is_prepared(clk->hw);
out:
return !!ret;
}
bool __clk_is_enabled(struct clk *clk)
{
int ret;
......
......@@ -45,6 +45,10 @@ struct clk_hw;
* undo any work done in the @prepare callback. Called with
* prepare_lock held.
*
* @is_prepared: Queries the hardware to determine if the clock is prepared.
* This function is allowed to sleep. Optional, if this op is not
* set then the prepare count will be used.
*
* @enable: Enable the clock atomically. This must not return until the
* clock is generating a valid clock signal, usable by consumer
* devices. Called with enable_lock held. This function must not
......@@ -108,6 +112,7 @@ struct clk_hw;
struct clk_ops {
int (*prepare)(struct clk_hw *hw);
void (*unprepare)(struct clk_hw *hw);
int (*is_prepared)(struct clk_hw *hw);
int (*enable)(struct clk_hw *hw);
void (*disable)(struct clk_hw *hw);
int (*is_enabled)(struct clk_hw *hw);
......@@ -351,6 +356,7 @@ unsigned int __clk_get_enable_count(struct clk *clk);
unsigned int __clk_get_prepare_count(struct clk *clk);
unsigned long __clk_get_rate(struct clk *clk);
unsigned long __clk_get_flags(struct clk *clk);
bool __clk_is_prepared(struct clk *clk);
bool __clk_is_enabled(struct clk *clk);
struct clk *__clk_lookup(const char *name);
......
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