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authorLinus Torvalds <torvalds@linux-foundation.org>2011-10-27 08:41:50 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2011-10-27 08:41:50 +0200
commit18974369cfe23acf16d0fb79e0d1fba7a9a95ec0 (patch)
tree22367984dbd4c79e9635035e268c428444c40e76 /include
parent7e0a6fd5a4723c79cc46c9541e343092302e0e5b (diff)
parent196a57c2749119be4732cc2b2adb8aafcb4fcb14 (diff)
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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.h43
-rw-r--r--include/linux/clkdev.h7
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, ...);