clk: add helper functions clk_prepare_enable and clk_disable_unprepare (42c5d52f) · Commits · 戴 / test

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>

include/linux/clk.h

+22 −0

Original line number	Diff line number	Diff line
		@@ -107,6 +107,28 @@ static inline void clk_unprepare(struct clk *clk)
		}
		#endif

		/* clk_prepare_enable helps cases using clk_enable in non-atomic context. */
		static inline int clk_prepare_enable(struct clk *clk)
		{
		int ret;

		ret = clk_prepare(clk);
		if (ret)
		return ret;
		ret = clk_enable(clk);
		if (ret)
		clk_unprepare(clk);

		return ret;
		}

		/* clk_disable_unprepare helps cases using clk_disable in non-atomic context. */
		static inline void clk_disable_unprepare(struct clk *clk)
		{
		clk_disable(clk);
		clk_unprepare(clk);
		}

		/**
		* clk_get_rate - obtain the current clock rate (in Hz) for a clock source.
		* This is only valid once the clock source has been enabled.

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