XWAY_MDIO_MIICTRL_TXSKEW_MASK
txskew = FIELD_GET(XWAY_MDIO_MIICTRL_TXSKEW_MASK, val);
val |= FIELD_PREP(XWAY_MDIO_MIICTRL_TXSKEW_MASK, int_delay);
XWAY_MDIO_MIICTRL_TXSKEW_MASK, val);