ALPHA_PLL_ACK_LATCH
return __alpha_pll_trion_set_rate(hw, rate, prate, PLL_UPDATE, ALPHA_PLL_ACK_LATCH);
wait_for_pll(pll, ALPHA_PLL_ACK_LATCH, 0, "update_ack_set")
wait_for_pll(pll, ALPHA_PLL_ACK_LATCH, 1, "update_ack_clear")