DS1388_REG_FLAG
err = regmap_read(ds1307->regmap, DS1388_REG_FLAG, &val);
ret = regmap_read(ds1307->regmap, DS1388_REG_FLAG, &tmp);
regmap_update_bits(ds1307->regmap, DS1388_REG_FLAG,
ret = regmap_update_bits(ds1307->regmap, DS1388_REG_FLAG,