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[ARM] omap: create a proper tree of clocks

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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>
This commit is contained in:
Russell King
2009-01-31 10:05:51 +00:00
committed by Russell King
parent b5088c0d90
commit 3f0a820c4c
9 changed files with 74 additions and 128 deletions
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7
arch/arm/plat-omap/include/mach/clock.h
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@@ -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)