blackfin: bf60x: add clock support

Add clock support for bf60x.

Signed-off-by: Steven Miao <realmz6@gmail.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>

arch/blackfin/mach-common/clock.h

@@ -0,0 +1,27 @@
+#ifndef __MACH_COMMON_CLKDEV_H
+#define __MACH_COMMON_CLKDEV_H
+
+#include <linux/clk.h>
+
+struct clk_ops {
+	unsigned long (*get_rate)(struct clk *clk);
+	unsigned long (*round_rate)(struct clk *clk, unsigned long rate);
+	int (*set_rate)(struct clk *clk, unsigned long rate);
+	int (*enable)(struct clk *clk);
+	int (*disable)(struct clk *clk);
+};
+
+struct clk {
+	const char		*name;
+	unsigned long           rate;
+	spinlock_t 		lock;
+	u32			flags;
+	const struct clk_ops    *ops;
+	const struct params 	*params;
+	void __iomem            *reg;
+	u32			mask;
+	u32			shift;
+};
+
+#endif
+