[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>

1 files changed, 5 insertions, 2 deletions

diff --git a/arch/arm/plat-omap/include/mach/clock.h b/arch/arm/plat-omap/include/mach/clock.h
index 8705902de1d..af6ae4fa46d 100644
--- a/arch/arm/plat-omap/include/mach/clock.h
+++ b/arch/arm/plat-omap/include/mach/clock.h
@@ -70,6 +70,8 @@ struct clk {
         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 @@ struct clk_functions {
 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 @@ extern const struct clkops clkops_null;
 /* 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)