clk: sunxi-ng: mux: Get closest parent rate possible with CLK_SET_RATE_PARENT

If the CLK_SET_RATE_PARENT flag is set, we want to try getting the
closest parent rate.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/drivers/clk/sunxi-ng/ccu_mux.c b/drivers/clk/sunxi-ng/ccu_mux.c
index d0d69c7eb516..c6bb1f523232 100644
--- a/drivers/clk/sunxi-ng/ccu_mux.c
+++ b/drivers/clk/sunxi-ng/ccu_mux.c
@@ -93,7 +93,18 @@ int ccu_mux_helper_determine_rate(struct ccu_common *common,
                 if (!parent)
                         continue;
 
-                parent_rate = clk_hw_get_rate(parent);
+                if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) {
+                        struct clk_rate_request parent_req = *req;
+                        int ret = __clk_determine_rate(parent, &parent_req);
+
+                        if (ret)
+                                continue;
+
+                        parent_rate = parent_req.rate;
+                } else {
+                        parent_rate = clk_hw_get_rate(parent);
+                }
+
                 adj_parent_rate = parent_rate;
                 ccu_mux_helper_adjust_parent_for_prediv(common, cm, i,
                                                         &adj_parent_rate);