[PATCH 01/12] clk: add helper functions clk_prepare_enable and clk_disable_unprepare
Shawn Guo
shawn.guo at linaro.org
Tue Dec 20 07:00:32 EST 2011
From: Richard Zhao <richard.zhao at linaro.org>
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 at linaro.org>
Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
Signed-off-by: Shawn Guo <shawn.guo at linaro.org>
Cc: Russell King <linux at arm.linux.org.uk>
---
include/linux/clk.h | 22 ++++++++++++++++++++++
1 files changed, 22 insertions(+), 0 deletions(-)
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 7213b52..b9d46fa 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.
--
1.7.4.1
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