[ARM] 3628/1: S3C24XX: add get_rate call to struct clk

Patch from Ben Dooks

Add a get_rate call to allow an given clock
to over-ride the clk_get_rate() call.

This provides support for clocks which rely on
division of their parent to correctly report
their frequency when the parent can also change.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/mach-s3c2410/clock.c b/arch/arm/mach-s3c2410/clock.c
index f553e5e..c5c93c3 100644 (file)
--- a/arch/arm/mach-s3c2410/clock.c
+++ b/arch/arm/mach-s3c2410/clock.c
@@ -148,8 +148,11 @@ unsigned long clk_get_rate(struct clk *clk)
        if (clk->rate != 0)
                return clk->rate;
 
-       while (clk->parent != NULL && clk->rate == 0)
-               clk = clk->parent;
+       if (clk->get_rate != NULL)
+               return (clk->get_rate)(clk);
+
+       if (clk->parent != NULL)
+               return clk_get_rate(clk->parent);
 
        return clk->rate;
 }

diff --git a/arch/arm/mach-s3c2410/clock.h b/arch/arm/mach-s3c2410/clock.h
index 1bee570..9456c81 100644 (file)
--- a/arch/arm/mach-s3c2410/clock.h
+++ b/arch/arm/mach-s3c2410/clock.h
@@ -22,6 +22,7 @@ struct clk {
 
        int                 (*enable)(struct clk *, int enable);
        int                 (*set_rate)(struct clk *c, unsigned long rate);
+       unsigned long       (*get_rate)(struct clk *c);
        unsigned long       (*round_rate)(struct clk *c, unsigned long rate);
        int                 (*set_parent)(struct clk *c, struct clk *parent);
 };