Commit 3cc8247f authored by Ulf Hansson's avatar Ulf Hansson Committed by Mike Turquette
Browse files

clk: Introduce optional unprepare_unused callback 



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: default avatarUlf Hansson <ulf.hansson@linaro.org>
Acked-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarMike Turquette <mturquette@linaro.org>
parent 1c155b3d

drivers/clk/clk.c

+5 −2
Original line number Diff line number Diff line
@@ -352,10 +352,13 @@ 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 */

static void clk_disable_unused_subtree(struct clk *clk)

include/linux/clk-provider.h

+5 −0
Original line number Diff line number Diff line
@@ -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);

CRA Git | Maintained and supported by SUSTech CRA and CCSE