F_CHIP_REV
ret = regmap_field_read(bd->rmap_fields[F_CHIP_REV], &bd->chip_rev);
[F_CHIP_REV] = REG_FIELD(CHIP_REV, 0, 15),
[F_CHIP_REV] = REG_FIELD(RT9455_REG_DEV_ID, 0, 3),