__mxl86110_read_extended_reg
ret = __mxl86110_read_extended_reg(phydev, regnum);
ret = __mxl86110_read_extended_reg(phydev, 0xf);
ret = __mxl86110_read_extended_reg(phydev, MXL86110_EXT_CHIP_CFG_REG);
page = __mxl86110_read_extended_reg(phydev, MXL86111_EXT_SMI_SDS_PHY_REG);