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authorPaul Mundt <lethal@linux-sh.org>2007-07-20 13:30:07 +0900
committerPaul Mundt <lethal@linux-sh.org>2007-07-20 13:30:07 +0900
commitfe04d7798f611bca333df27d44484bdd62eef53f (patch)
treea8b62c7f9812c51434f1ab843aabc0b51aa8145c /arch/sh
parentf6991b0456416186b578d38717efcda2b012b79c (diff)
downloadlinux-fe04d7798f611bca333df27d44484bdd62eef53f.tar.bz2
sh: Support rate rounding for SH7722 FRQCR clocks.
Now that the round_rate() op is supported, hook it up on SH7722 for the FRQCR (CPU, PCLK, etc.) clocks. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh')
-rw-r--r--arch/sh/kernel/cpu/sh4a/clock-sh7722.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/sh/kernel/cpu/sh4a/clock-sh7722.c b/arch/sh/kernel/cpu/sh4a/clock-sh7722.c
index 51b386d454de..a0fd8bb21f7c 100644
--- a/arch/sh/kernel/cpu/sh4a/clock-sh7722.c
+++ b/arch/sh/kernel/cpu/sh4a/clock-sh7722.c
@@ -387,9 +387,24 @@ out_err:
return err;
}
+static long sh7722_frqcr_round_rate(struct clk *clk, unsigned long rate)
+{
+ unsigned long parent_rate = clk->parent->rate;
+ int div;
+
+ /* look for multiplier/divisor pair */
+ div = sh7722_find_divisors(parent_rate, rate);
+ if (div < 0)
+ return clk->rate;
+
+ /* calculate new value of clock rate */
+ return parent_rate * 2 / div;
+}
+
static struct clk_ops sh7722_frqcr_clk_ops = {
.recalc = sh7722_frqcr_recalc,
.set_rate = sh7722_frqcr_set_rate,
+ .round_rate = sh7722_frqcr_round_rate,
};
/*