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author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-10-27 08:41:50 +0200 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-10-27 08:41:50 +0200 |
commit | 18974369cfe23acf16d0fb79e0d1fba7a9a95ec0 (patch) | |
tree | 22367984dbd4c79e9635035e268c428444c40e76 /include | |
parent | 7e0a6fd5a4723c79cc46c9541e343092302e0e5b (diff) | |
parent | 196a57c2749119be4732cc2b2adb8aafcb4fcb14 (diff) | |
download | linux-3.10-18974369cfe23acf16d0fb79e0d1fba7a9a95ec0.tar.gz linux-3.10-18974369cfe23acf16d0fb79e0d1fba7a9a95ec0.tar.bz2 linux-3.10-18974369cfe23acf16d0fb79e0d1fba7a9a95ec0.zip |
Merge branch 'clk' of http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm
* 'clk' of http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm:
ARM: 7131/1: clkdev: Add Common Macro for clk_lookup
clk: spi-pl022: convert to clk_prepare()/clk_unprepare()
clk: timer-sp: convert to clk_prepare()/clk_unprepare()
clk: sa1111: convert to clk_prepare()/clk_unprepare()
clk: mmci: convert to clk_prepare()/clk_unprepare()
clk: amba-pl011: convert to clk_prepare()/clk_unprepare()
clk: amba-pl010: convert to clk_prepare()/clk_unprepare()
clk: amba-clcd: convert to clk_prepare()/clk_unprepare()
clk: amba bus: convert to clk_prepare()/clk_unprepare()
clk: provide prepare/unprepare functions
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/clk.h | 43 | ||||
-rw-r--r-- | include/linux/clkdev.h | 7 |
2 files changed, 50 insertions, 0 deletions
diff --git a/include/linux/clk.h b/include/linux/clk.h index 1d37f42ac29..7213b52b2c0 100644 --- a/include/linux/clk.h +++ b/include/linux/clk.h @@ -11,6 +11,8 @@ #ifndef __LINUX_CLK_H #define __LINUX_CLK_H +#include <linux/kernel.h> + struct device; /* @@ -41,11 +43,31 @@ struct clk; struct clk *clk_get(struct device *dev, const char *id); /** + * clk_prepare - prepare a clock source + * @clk: clock source + * + * This prepares the clock source for use. + * + * Must not be called from within atomic context. + */ +#ifdef CONFIG_HAVE_CLK_PREPARE +int clk_prepare(struct clk *clk); +#else +static inline int clk_prepare(struct clk *clk) +{ + might_sleep(); + return 0; +} +#endif + +/** * clk_enable - inform the system when the clock source should be running. * @clk: clock source * * If the clock can not be enabled/disabled, this should return success. * + * May be called from atomic contexts. + * * Returns success (0) or negative errno. */ int clk_enable(struct clk *clk); @@ -57,6 +79,8 @@ int clk_enable(struct clk *clk); * Inform the system that a clock source is no longer required by * a driver and may be shut down. * + * May be called from atomic contexts. + * * Implementation detail: if the clock source is shared between * multiple drivers, clk_enable() calls must be balanced by the * same number of clk_disable() calls for the clock source to be @@ -64,6 +88,25 @@ int clk_enable(struct clk *clk); */ void clk_disable(struct clk *clk); + +/** + * clk_unprepare - undo preparation of a clock source + * @clk: clock source + * + * This undoes a previously prepared clock. The caller must balance + * the number of prepare and unprepare calls. + * + * Must not be called from within atomic context. + */ +#ifdef CONFIG_HAVE_CLK_PREPARE +void clk_unprepare(struct clk *clk); +#else +static inline void clk_unprepare(struct clk *clk) +{ + might_sleep(); +} +#endif + /** * 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. diff --git a/include/linux/clkdev.h b/include/linux/clkdev.h index 457bcb0a310..d9a4fd028c9 100644 --- a/include/linux/clkdev.h +++ b/include/linux/clkdev.h @@ -24,6 +24,13 @@ struct clk_lookup { struct clk *clk; }; +#define CLKDEV_INIT(d, n, c) \ + { \ + .dev_id = d, \ + .con_id = n, \ + .clk = c, \ + } + struct clk_lookup *clkdev_alloc(struct clk *clk, const char *con_id, const char *dev_fmt, ...); |