clk: propagate round_rate for CLK_SET_RATE_PARENT case

Need to propagate round_rate call for the clk that has no .round_rate
operation but with flag CLK_SET_RATE_PARENT set.

For example, clk_mux is a clk with no .round_rate operation.  However,
it could likely be in a clk_set_rate propagation path, saying it has
parent clk who has .round_rate and .set_rate operations.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 62ecac53b0a236be9cc45d9cd85a2841419b9247..c6e8866289b4ab71329e8e17750bf7258e35f409 100644 (file)
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -587,8 +587,12 @@ unsigned long __clk_round_rate(struct clk *clk, unsigned long rate)
        if (!clk)
                return -EINVAL;
 
-       if (!clk->ops->round_rate)
-               return clk->rate;
+       if (!clk->ops->round_rate) {
+               if (clk->flags & CLK_SET_RATE_PARENT)
+                       return __clk_round_rate(clk->parent, rate);
+               else
+                       return clk->rate;
+       }
 
        if (clk->parent)
                parent_rate = clk->parent->rate;