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clk: Introduce optional is_prepared callback
To reflect whether a clk_hw is prepared the clk_hw may implement the optional is_prepared callback. If not implemented we fall back to use the software prepare counter. 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>
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@ -451,6 +451,27 @@ unsigned long __clk_get_flags(struct clk *clk)
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return !clk ? 0 : clk->flags;
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}
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bool __clk_is_prepared(struct clk *clk)
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{
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int ret;
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if (!clk)
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return false;
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/*
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* .is_prepared is optional for clocks that can prepare
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* fall back to software usage counter if it is missing
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*/
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if (!clk->ops->is_prepared) {
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ret = clk->prepare_count ? 1 : 0;
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goto out;
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}
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ret = clk->ops->is_prepared(clk->hw);
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out:
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return !!ret;
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}
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bool __clk_is_enabled(struct clk *clk)
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{
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int ret;
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@ -45,6 +45,10 @@ struct clk_hw;
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* undo any work done in the @prepare callback. Called with
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* prepare_lock held.
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*
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* @is_prepared: Queries the hardware to determine if the clock is prepared.
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* This function is allowed to sleep. Optional, if this op is not
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* set then the prepare count will be used.
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*
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* @enable: Enable the clock atomically. This must not return until the
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* clock is generating a valid clock signal, usable by consumer
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* devices. Called with enable_lock held. This function must not
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@ -108,6 +112,7 @@ struct clk_hw;
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struct clk_ops {
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int (*prepare)(struct clk_hw *hw);
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void (*unprepare)(struct clk_hw *hw);
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int (*is_prepared)(struct clk_hw *hw);
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int (*enable)(struct clk_hw *hw);
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void (*disable)(struct clk_hw *hw);
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int (*is_enabled)(struct clk_hw *hw);
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@ -351,6 +356,7 @@ unsigned int __clk_get_enable_count(struct clk *clk);
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unsigned int __clk_get_prepare_count(struct clk *clk);
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unsigned long __clk_get_rate(struct clk *clk);
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unsigned long __clk_get_flags(struct clk *clk);
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bool __clk_is_prepared(struct clk *clk);
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bool __clk_is_enabled(struct clk *clk);
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struct clk *__clk_lookup(const char *name);
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