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clk: Introduce optional unprepare_unused callback

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An unprepare_unused callback is introduced due to the same reasons to
why the disable_unused callback was added.

During the clk_disable_unused sequence, those clk_hw that needs specific
treatment with regards to being unprepared, shall implement the
unprepare_unused callback.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
This commit is contained in:
Ulf Hansson 2013-03-12 20:26:04 +01:00 committed by Mike Turquette
parent 1c155b3dfe
commit 3cc8247f1d
2 changed files with 10 additions and 2 deletions
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7
drivers/clk/clk.c
View file

@ -352,9 +352,12 @@ static void clk_unprepare_unused_subtree(struct clk *clk)
if (clk->flags & CLK_IGNORE_UNUSED)
return;
if (__clk_is_prepared(clk))
if (clk->ops->unprepare)
if (__clk_is_prepared(clk)) {
if (clk->ops->unprepare_unused)
clk->ops->unprepare_unused(clk->hw);
else if (clk->ops->unprepare)
clk->ops->unprepare(clk->hw);
}
}
/* caller must hold prepare_lock */

5
include/linux/clk-provider.h
View file

@ -49,6 +49,10 @@ struct clk_hw;
* This function is allowed to sleep. Optional, if this op is not
* set then the prepare count will be used.
*
* @unprepare_unused: Unprepare the clock atomically. Only called from
* clk_disable_unused for prepare clocks with special needs.
* Called with prepare mutex held. This function may sleep.
*
* @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
@ -113,6 +117,7 @@ struct clk_ops {
int (*prepare)(struct clk_hw *hw);
void (*unprepare)(struct clk_hw *hw);
int (*is_prepared)(struct clk_hw *hw);
void (*unprepare_unused)(struct clk_hw *hw);
int (*enable)(struct clk_hw *hw);
void (*disable)(struct clk_hw *hw);
int (*is_enabled)(struct clk_hw *hw);