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Commit 7c09b858 authored by Maxime Ripard's avatar Maxime Ripard
Browse files

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: default avatarChen-Yu Tsai <wens@csie.org>
Signed-off-by: default avatarMaxime Ripard <maxime.ripard@free-electrons.com>
parent 0c3c8e13

drivers/clk/sunxi-ng/ccu_common.h

+2 −0
Original line number Diff line number Diff line
@@ -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;

drivers/clk/sunxi-ng/ccu_mux.c

+7 −1
Original line number Diff line number Diff line
@@ -25,9 +25,15 @@ void ccu_mux_helper_adjust_parent_for_prediv(struct ccu_common *common, 
	int i;



	if (!((common->features & CCU_FEATURE_FIXED_PREDIV) ||

	      (common->features & CCU_FEATURE_VARIABLE_PREDIV)))

	      (common->features & CCU_FEATURE_VARIABLE_PREDIV) ||

	      (common->features & CCU_FEATURE_ALL_PREDIV)))

		return;



	if (common->features & CCU_FEATURE_ALL_PREDIV) {

		*parent_rate = *parent_rate / common->prediv;

		return;

	}



	reg = readl(common->base + common->reg);

	if (parent_index < 0) {

		parent_index = reg >> cm->shift;