[ARM] omap: create a proper tree of clocks
Traditionally, we've tracked the parent/child relationships between
clk structures by setting the child's parent member to point at the
upstream clock. As a result, when decending the tree, we have had
to scan all clocks to find the children.
Avoid this wasteful scanning by keeping a list of the clock's children.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/plat-omap/include/mach/clock.h b/arch/arm/plat-omap/include/mach/clock.h
index 8705902..af6ae4f 100644
--- a/arch/arm/plat-omap/include/mach/clock.h
+++ b/arch/arm/plat-omap/include/mach/clock.h
@@ -70,6 +70,8 @@
const char *name;
int id;
struct clk *parent;
+ struct list_head children;
+ struct list_head sibling; /* node for children */
unsigned long rate;
__u32 flags;
void __iomem *enable_reg;
@@ -115,7 +117,9 @@
extern unsigned int mpurate;
extern int clk_init(struct clk_functions *custom_clocks);
+extern void clk_init_one(struct clk *clk);
extern int clk_register(struct clk *clk);
+extern void clk_reparent(struct clk *child, struct clk *parent);
extern void clk_unregister(struct clk *clk);
extern void propagate_rate(struct clk *clk);
extern void recalculate_root_clocks(void);
@@ -131,8 +135,7 @@
/* Clock flags */
/* bit 0 is free */
#define RATE_FIXED (1 << 1) /* Fixed clock rate */
-#define RATE_PROPAGATES (1 << 2) /* Program children too */
-/* bits 3-4 are free */
+/* bits 2-4 are free */
#define ENABLE_REG_32BIT (1 << 5) /* Use 32-bit access */
#define CLOCK_IDLE_CONTROL (1 << 7)
#define CLOCK_NO_IDLE_PARENT (1 << 8)