clk: sunxi-ng: Implement global pre-divider

Some clocks have a global pre-divider that applies to all their parents.

Since it might also apply to clocks that have a single parent, this is
merged in the ccu_common structure, unlike the other pre-divider settings
that are tied to a specific index, and thus a specific parent.

Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

drivers/clk/sunxi-ng/ccu_common.h

@@ -21,6 +21,7 @@
 #define CCU_FEATURE_VARIABLE_PREDIV	BIT(1)
 #define CCU_FEATURE_FIXED_PREDIV	BIT(2)
 #define CCU_FEATURE_FIXED_POSTDIV	BIT(3)
+#define CCU_FEATURE_ALL_PREDIV		BIT(4)
 
 struct device_node;
 
@@ -56,6 +57,7 @@ struct device_node;
 struct ccu_common {
 	void __iomem	*base;
 	u16		reg;
+	u32		prediv;
 
 	unsigned long	features;
 	spinlock_t	*lock;