clk: add helper functions clk_prepare_enable and clk_disable_unprepare
It's for migrating to generic clk framework API. The helper functions help cases clk_enable/clk_disable is used in non-atomic context. For example, Call clk_enable in probe and clk_disable in remove. Signed-off-by: Richard Zhao <richard.zhao@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Cc: Russell King <linux@arm.linux.org.uk> Acked-by: Marek Vasut <marek.vasut@gmail.com>
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@ -107,6 +107,28 @@ static inline void clk_unprepare(struct clk *clk)
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}
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#endif
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/* clk_prepare_enable helps cases using clk_enable in non-atomic context. */
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static inline int clk_prepare_enable(struct clk *clk)
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{
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int ret;
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ret = clk_prepare(clk);
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if (ret)
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return ret;
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ret = clk_enable(clk);
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if (ret)
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clk_unprepare(clk);
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return ret;
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}
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/* clk_disable_unprepare helps cases using clk_disable in non-atomic context. */
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static inline void clk_disable_unprepare(struct clk *clk)
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{
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clk_disable(clk);
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clk_unprepare(clk);
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}
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/**
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* clk_get_rate - obtain the current clock rate (in Hz) for a clock source.
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* This is only valid once the clock source has been enabled.
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