MV88E1XXX_EXT_PHY_SPECIFIC_CNTRL_REGISTER
(void) simple_mdio_read(cphy, MV88E1XXX_EXT_PHY_SPECIFIC_CNTRL_REGISTER, &val);
(void) simple_mdio_write(cphy, MV88E1XXX_EXT_PHY_SPECIFIC_CNTRL_REGISTER, val);