[PATCH V4 01/14] clk: add helper functions clk_prepare_enable and clk_disable_unprepare
From: Richard Zhao <hidden>
Date: 2011-11-15 06:47:56
Also in:
linux-i2c, linux-mmc, linux-serial, netdev
Subsystem:
clk api, the rest · Maintainers:
Russell King, Linus Torvalds
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 <redacted> --- 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.
--
1.7.5.4