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authorRichard Zhao <richard.zhao@linaro.org>2011-11-15 14:47:56 +0800
committerShawn Guo <shawn.guo@linaro.org>2011-12-28 21:25:35 +0800
commit42c5d52f2bbf68add2d7a6982753993e0c75a119 (patch)
tree725714648698dd69e568b198ddd7c753cb38973a /include/linux/clk.h
parent384703b8e6cd4c8ef08512e596024e028c91c339 (diff)
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>
Diffstat (limited to 'include/linux/clk.h')
-rw-r--r--include/linux/clk.h22
1 files changed, 22 insertions, 0 deletions
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 7213b52b2c0e..b9d46fa154b4 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -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.