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 <[e-mail]>
Signed-off-by: Maxime Ripard <[e-mail]>

drivers/clk/sunxi-ng/ccu_mux.c

···
 		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);