RTCA3_RCR1_PES
val = FIELD_PREP(RTCA3_RCR1_PES, RTCA3_RCR1_PES_1_64_SEC);
rtca3_byte_update_bits(priv, RTCA3_RCR1, RTCA3_RCR1_PES, val);
return readb_poll_timeout(priv->base + RTCA3_RCR1, tmp, ((tmp & RTCA3_RCR1_PES) == val),