clk_hw_reparent
clk_hw_reparent(other_mux_hw, hwp);
clk_hw_reparent(clk_mmux->mmux->hws[n], hwp);
clk_hw_reparent(&tegra->hw, __clk_get_hw(timing->parent));
clk_hw_reparent(hw, parent);
void clk_hw_reparent(struct clk_hw *hw, struct clk_hw *new_parent);