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

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
......@@ -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
......
......@@ -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;
......
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