MV88E6XXX_G1_ATU_DATA
err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_ATU_DATA, &atu_data);
err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_ATU_DATA, &val);
return mv88e6xxx_g1_write(chip, MV88E6XXX_G1_ATU_DATA, data);