RATE_TO_U64
p->clk->range.min_rate = RATE_TO_U64(r->rate[0]);
p->clk->range.max_rate = RATE_TO_U64(r->rate[1]);
p->clk->range.step_size = RATE_TO_U64(r->rate[2]);
*rate = RATE_TO_U64(r->rate[st->loop_idx]);