Quoting Manivannan Sadhasivam (2018-03-17 03:09:48)

+
+static int clk_val_best(struct clk_hw *hw, unsigned long rate,
+                       unsigned long *best_parent_rate)
+{

[...]

+               }
+
+               parent_rate = clk_hw_round_rate(clk_hw_get_parent(hw),
+                               try_parent_rate);
+               cur_rate = DIV_ROUND_UP(parent_rate, clkt->div) * clkt->mul;
+               if (cur_rate <= rate && cur_rate > best) {
+                       bestval = clkt->val;
+                       best = cur_rate;
+                       *best_parent_rate = parent_rate;
+               }
+       }
+
+       if (!bestval) {
+               bestval = _get_table_maxval(clkt);
+               *best_parent_rate = clk_hw_round_rate(
+                               clk_hw_get_parent(hw), 1);
+       }
+
+       return bestval;

Also, if this is largely copy/paste from the factor clk code then
perhaps those functions can be exported to here and reused instead of
copy/paste.

+}