[ARM] MXC: add clkdev support

This patch only adds general clkdev support without actually switching
any MXC architecture to clkdev.

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

arch/arm/plat-mxc/clock.c

@@ -47,6 +47,11 @@ static DEFINE_MUTEX(clocks_mutex);
  * Standard clock functions defined in include/linux/clk.h
  *-------------------------------------------------------------------------*/
 
+/*
+ * All the code inside #ifndef CONFIG_COMMON_CLKDEV can be removed once all
+ * MXC architectures have switched to using clkdev.
+ */
+#ifndef CONFIG_COMMON_CLKDEV
 /*
  * Retrieve a clock by name.
  *
@@ -110,6 +115,7 @@ struct clk *clk_get(struct device *dev, const char *id)
 	return clk;
 }
 EXPORT_SYMBOL(clk_get);
+#endif
 
 static void __clk_disable(struct clk *clk)
 {
@@ -187,13 +193,15 @@ unsigned long clk_get_rate(struct clk *clk)
 }
 EXPORT_SYMBOL(clk_get_rate);
 
+#ifndef CONFIG_COMMON_CLKDEV
 /* Decrement the clock's module reference count */
 void clk_put(struct clk *clk)
 {
 	if (clk && !IS_ERR(clk))
 		module_put(clk->owner);
 }
 EXPORT_SYMBOL(clk_put);
+#endif
 
 /* Round the requested clock rate to the nearest supported
  * rate that is less than or equal to the requested rate.
@@ -257,6 +265,7 @@ struct clk *clk_get_parent(struct clk *clk)
 }
 EXPORT_SYMBOL(clk_get_parent);
 
+#ifndef CONFIG_COMMON_CLKDEV
 /*
  * Add a new clock to the clock tree.
  */
@@ -327,6 +336,7 @@ static int __init mxc_setup_proc_entry(void)
 }
 
 late_initcall(mxc_setup_proc_entry);
+#endif /* CONFIG_PROC_FS */
 #endif
 
 /*

arch/arm/plat-mxc/include/mach/clkdev.h

@@ -0,0 +1,7 @@
+#ifndef __ASM_MACH_CLKDEV_H
+#define __ASM_MACH_CLKDEV_H
+
+#define __clk_get(clk) ({ 1; })
+#define __clk_put(clk) do { } while (0)
+
+#endif

arch/arm/plat-mxc/include/mach/clock.h

@@ -26,9 +26,13 @@
 struct module;
 
 struct clk {
+#ifndef CONFIG_COMMON_CLKDEV
+	/* As soon as i.MX1 and i.MX31 switched to clkdev, this
+	 * block can go away */
 	struct list_head node;
 	struct module *owner;
 	const char *name;
+#endif
 	int id;
 	/* Source clock this clk depends on */
 	struct clk *parent;