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: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Mike Turquette <mturquette@linaro.org>
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@ -557,25 +557,6 @@ int clk_enable(struct clk *clk)
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}
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EXPORT_SYMBOL_GPL(clk_enable);
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/**
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* clk_get_rate - return the rate of clk
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* @clk: the clk whose rate is being returned
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*
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* Simply returns the cached rate of the clk. Does not query the hardware. If
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* clk is NULL then returns 0.
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*/
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unsigned long clk_get_rate(struct clk *clk)
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{
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unsigned long rate;
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mutex_lock(&prepare_lock);
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rate = __clk_get_rate(clk);
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mutex_unlock(&prepare_lock);
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return rate;
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}
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EXPORT_SYMBOL_GPL(clk_get_rate);
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/**
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* __clk_round_rate - round the given rate for a clk
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* @clk: round the rate of this clock
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@ -701,6 +682,30 @@ static void __clk_recalc_rates(struct clk *clk, unsigned long msg)
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__clk_recalc_rates(child, msg);
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}
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/**
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* clk_get_rate - return the rate of clk
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* @clk: the clk whose rate is being returned
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*
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* Simply returns the cached rate of the clk, unless CLK_GET_RATE_NOCACHE flag
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* is set, which means a recalc_rate will be issued.
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* If clk is NULL then returns 0.
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*/
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unsigned long clk_get_rate(struct clk *clk)
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{
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unsigned long rate;
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mutex_lock(&prepare_lock);
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if (clk && (clk->flags & CLK_GET_RATE_NOCACHE))
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__clk_recalc_rates(clk, 0);
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rate = __clk_get_rate(clk);
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mutex_unlock(&prepare_lock);
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return rate;
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}
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EXPORT_SYMBOL_GPL(clk_get_rate);
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/**
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* __clk_speculate_rates
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* @clk: first clk in the subtree
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@ -26,6 +26,7 @@
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#define CLK_IGNORE_UNUSED BIT(3) /* do not gate even if unused */
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#define CLK_IS_ROOT BIT(4) /* root clk, has no parent */
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#define CLK_IS_BASIC BIT(5) /* Basic clk, can't do a to_clk_foo() */
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#define CLK_GET_RATE_NOCACHE BIT(6) /* do not use the cached clk rate */
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struct clk_hw;
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