[v2,1/3] CLK: get rid of HAVE_CLK_PREPARE

Commit Message

Dmitry Torokhov Nov. 22, 2012, 5:34 a.m. UTC

HAVE_CLK_PREPARE is automatically selected by COMMON_CLK and the only
platform that explicitly selects HAVE_CLK_PREPARE is MXS which has been
switched to common clk framework, so we can delete this option now.

As part of this change we move declarations of clk_prepare() and
clk_unprepare() under HAVE_CLK and provide stubs if this option is not
enabled.

Reviewed-by: Viresh Kumar <[e-mail]>
Signed-off-by: Dmitry Torokhov <[e-mail]>
---
 arch/arm/Kconfig    |  1 -
 drivers/clk/Kconfig |  4 ----
 include/linux/clk.h | 68 +++++++++++++++++++++++++----------------------------
 3 files changed, 32 insertions(+), 41 deletions(-)

Comments

Shawn Guo Nov. 22, 2012, 6:12 a.m. UTC | #1

On Wed, Nov 21, 2012 at 09:34:40PM -0800, Dmitry Torokhov wrote:
> HAVE_CLK_PREPARE is automatically selected by COMMON_CLK and the only
> platform that explicitly selects HAVE_CLK_PREPARE is MXS which has been
> switched to common clk framework, so we can delete this option now.
> 
> As part of this change we move declarations of clk_prepare() and
> clk_unprepare() under HAVE_CLK and provide stubs if this option is not
> enabled.
> 
> Reviewed-by: Viresh Kumar <[e-mail]>
> Signed-off-by: Dmitry Torokhov <[e-mail]>

Acked-by: Shawn Guo <[e-mail]>

Russell King - ARM Linux Nov. 22, 2012, 9:54 a.m. UTC | #2

On Wed, Nov 21, 2012 at 09:34:40PM -0800, Dmitry Torokhov wrote:
> HAVE_CLK_PREPARE is automatically selected by COMMON_CLK and the only
> platform that explicitly selects HAVE_CLK_PREPARE is MXS which has been
> switched to common clk framework, so we can delete this option now.
> 
> As part of this change we move declarations of clk_prepare() and
> clk_unprepare() under HAVE_CLK and provide stubs if this option is not
> enabled.
> 
> Reviewed-by: Viresh Kumar <[e-mail]>
> Signed-off-by: Dmitry Torokhov <[e-mail]>

NAK, until some proper investigation about whether this can be removed
has been done.

Patch

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index ade7e92..ae6c1df 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -453,7 +453,6 @@  config ARCH_MXS
 	select CLKSRC_MMIO
 	select COMMON_CLK
 	select GENERIC_CLOCKEVENTS
-	select HAVE_CLK_PREPARE
 	select MULTI_IRQ_HANDLER
 	select PINCTRL
 	select SPARSE_IRQ
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index bace9e9..639ee9d 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -3,15 +3,11 @@  config CLKDEV_LOOKUP
 	bool
 	select HAVE_CLK
 
-config HAVE_CLK_PREPARE
-	bool
-
 config HAVE_MACH_CLKDEV
 	bool
 
 config COMMON_CLK
 	bool
-	select HAVE_CLK_PREPARE
 	select CLKDEV_LOOKUP
 	---help---
 	  The common clock framework is a single definition of struct
diff --git a/include/linux/clk.h b/include/linux/clk.h
index b3ac22d..f8204c3 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -84,42 +84,6 @@  int clk_notifier_unregister(struct clk *clk, struct notifier_block *nb);
 
 #endif
 
-/**
- * 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_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
-
 #ifdef CONFIG_HAVE_CLK
 /**
  * clk_get - lookup and obtain a reference to a clock producer.
@@ -159,6 +123,27 @@  struct clk *clk_get(struct device *dev, const char *id);
 struct clk *devm_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.
+ */
+int clk_prepare(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.
+ */
+void clk_unprepare(struct clk *clk);
+
+/**
  * clk_enable - inform the system when the clock source should be running.
  * @clk: clock source
  *
@@ -292,6 +277,17 @@  static inline void clk_put(struct clk *clk) {}
 
 static inline void devm_clk_put(struct device *dev, struct clk *clk) {}
 
+static inline int clk_prepare(struct clk *clk)
+{
+	might_sleep();
+	return 0;
+}
+
+static inline void clk_unprepare(struct clk *clk)
+{
+	might_sleep();
+}
+
 static inline int clk_enable(struct clk *clk)
 {
 	return 0;