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Commit a093bde2 authored by Ulf Hansson's avatar Ulf Hansson Committed by Mike Turquette
Browse files

clk: Provide option for clk_get_rate to issue hw for new rate 



By using CLK_GET_RATE_NOCACHE flag, we tell the clk_get_rate API to
issue the hw for an updated clock rate. This can be used for a clock
which rate may be updated without a client necessary modifying it.

Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: default avatarMike Turquette <mturquette@linaro.org>
parent 73118e61

drivers/clk/clk.c

+24 −19
Original line number Diff line number Diff line
@@ -557,25 +557,6 @@ int clk_enable(struct clk *clk) 
}

EXPORT_SYMBOL_GPL(clk_enable);



/**

 * clk_get_rate - return the rate of clk

 * @clk: the clk whose rate is being returned

 *

 * Simply returns the cached rate of the clk.  Does not query the hardware.  If

 * clk is NULL then returns 0.

 */

unsigned long clk_get_rate(struct clk *clk)

{

	unsigned long rate;



	mutex_lock(&prepare_lock);

	rate = __clk_get_rate(clk);

	mutex_unlock(&prepare_lock);



	return rate;

}

EXPORT_SYMBOL_GPL(clk_get_rate);



/**

 * __clk_round_rate - round the given rate for a clk

 * @clk: round the rate of this clock
@@ -701,6 +682,30 @@ static void __clk_recalc_rates(struct clk *clk, unsigned long msg) 
		__clk_recalc_rates(child, msg);

}



/**

 * clk_get_rate - return the rate of clk

 * @clk: the clk whose rate is being returned

 *

 * Simply returns the cached rate of the clk, unless CLK_GET_RATE_NOCACHE flag

 * is set, which means a recalc_rate will be issued.

 * If clk is NULL then returns 0.

 */

unsigned long clk_get_rate(struct clk *clk)

{

	unsigned long rate;



	mutex_lock(&prepare_lock);



	if (clk && (clk->flags & CLK_GET_RATE_NOCACHE))

		__clk_recalc_rates(clk, 0);



	rate = __clk_get_rate(clk);

	mutex_unlock(&prepare_lock);



	return rate;

}

EXPORT_SYMBOL_GPL(clk_get_rate);



/**

 * __clk_speculate_rates

 * @clk: first clk in the subtree

include/linux/clk-provider.h

+1 −0
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ 
#define CLK_IGNORE_UNUSED	BIT(3) /* do not gate even if unused */

#define CLK_IS_ROOT		BIT(4) /* root clk, has no parent */

#define CLK_IS_BASIC		BIT(5) /* Basic clk, can't do a to_clk_foo() */

#define CLK_GET_RATE_NOCACHE	BIT(6) /* do not use the cached clk rate */



struct clk_hw;