ARM: pxa: add clk_set_rate()

Since there're mulitple clock rates in some device controllers, enable
clk_set_rate() for this usage.

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>

2 files changed, 16 insertions, 0 deletions

diff --git a/arch/arm/mach-mmp/clock.c b/arch/arm/mach-mmp/clock.c
index 886e05648f08..7c6f95f29142 100644
--- a/arch/arm/mach-mmp/clock.c
+++ b/arch/arm/mach-mmp/clock.c
@@ -88,3 +88,18 @@ unsigned long clk_get_rate(struct clk *clk)
         return rate;
 }
 EXPORT_SYMBOL(clk_get_rate);
+
+int clk_set_rate(struct clk *clk, unsigned long rate)
+{
+        unsigned long flags;
+        int ret = -EINVAL;
+
+        if (clk->ops->setrate) {
+                spin_lock_irqsave(&clocks_lock, flags);
+                ret = clk->ops->setrate(clk, rate);
+                spin_unlock_irqrestore(&clocks_lock, flags);
+        }
+
+        return ret;
+}
+EXPORT_SYMBOL(clk_set_rate);
diff --git a/arch/arm/mach-mmp/clock.h b/arch/arm/mach-mmp/clock.h
index 9b027d7491f5..3143e994e672 100644
--- a/arch/arm/mach-mmp/clock.h
+++ b/arch/arm/mach-mmp/clock.h
@@ -12,6 +12,7 @@ struct clkops {
         void                    (*enable)(struct clk *);
         void                    (*disable)(struct clk *);
         unsigned long           (*getrate)(struct clk *);
+        int                     (*setrate)(struct clk *, unsigned long);
 };
 
 struct clk {