clk: provide static inline wrappers

So that drivers can use clk_* functions without having to ifdef
them away.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

3 files changed, 44 insertions, 1 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index e7d8cdd315..3a7483783c 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -34,6 +34,7 @@ config ARCH_AT91
 	select CLKDEV_LOOKUP
 	select HAS_DEBUG_LL
 	select HAVE_MACH_ARM_HEAD
+	select HAVE_CLK
 
 config ARCH_BCM2835
 	bool "Broadcom BCM2835 boards"
@@ -99,6 +100,7 @@ config ARCH_NOMADIK
 	bool "STMicroelectronics Nomadik"
 	select CPU_ARM926T
 	select CLOCKSOURCE_NOMADIK
+	select HAVE_CLK
 	help
 	  Support for the Nomadik platform by ST-Ericsson
 
@@ -133,6 +135,7 @@ config ARCH_VERSATILE
 	bool "ARM Versatile boards (ARM926EJ-S)"
 	select CPU_ARM926T
 	select GPIOLIB
+	select HAVE_CLK
 
 config ARCH_VEXPRESS
 	bool "ARM Vexpres boards"
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index a00e5395a2..daf778a441 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -1,8 +1,11 @@
+config HAVE_CLK
+	bool
 
 config CLKDEV_LOOKUP
 	bool
 
 config COMMON_CLK
+	select HAVE_CLK
 	bool
 
 config COMMON_CLK_OF_PROVIDER
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 0a565efb08..6aed1dee77 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -19,12 +19,13 @@ struct device_d;
  * The base API.
  */
 
-
 /*
  * struct clk - an machine class defined object / cookie.
  */
 struct clk;
 
+#ifdef CONFIG_HAVE_CLK
+
 /**
  * clk_get - lookup and obtain a reference to a clock producer.
  * @dev: device for clock "consumer"
@@ -157,6 +158,42 @@ struct clk *clk_get_sys(const char *dev_id, const char *con_id);
 int clk_add_alias(const char *alias, const char *alias_dev_name, char *id,
 			struct device_d *dev);
 
+#else
+
+static inline struct clk *clk_get(struct device_d *dev, const char *id)
+{
+	return NULL;
+}
+
+static inline int clk_enable(struct clk *clk)
+{
+	return 0;
+}
+
+static inline void clk_disable(struct clk *clk)
+{
+}
+
+static inline unsigned long clk_get_rate(struct clk *clk)
+{
+	return 0;
+}
+
+static inline void clk_put(struct clk *clk)
+{
+}
+
+static inline long clk_round_rate(struct clk *clk, unsigned long rate)
+{
+	return 0;
+}
+
+static inline int clk_set_rate(struct clk *clk, unsigned long rate)
+{
+	return 0;
+}
+#endif
+
 #ifdef CONFIG_COMMON_CLK
 struct clk_ops {
 	int		(*enable)(struct clk *clk);