clk_hw_can_set_rate_parent
if (!req->rate || (!clk_hw_can_set_rate_parent(hw) && req->rate >= req->best_parent_rate)) {
else if (clk_hw_can_set_rate_parent(hw))
if (!clk_hw_can_set_rate_parent(&cmp->common.hw)) {
if (!clk_hw_can_set_rate_parent(&nkm->common.hw))