mv88e6xxx_tai_read
err = mv88e6xxx_tai_read(chip, MV88E6XXX_TAI_CLOCK_PERIOD, &period_ps, 1);
err = mv88e6xxx_tai_read(chip, MV88E6352_TAI_TIME_LO, phc_time,
err = mv88e6xxx_tai_read(chip, MV88E6165_PTP_GC_TIME_LO, phc_time,
err = mv88e6xxx_tai_read(chip, MV88E6352_TAI_EVENT_STATUS,