MAX6639_REG_THERM_LIMIT
res = regmap_read(data->regmap, MAX6639_REG_THERM_LIMIT(channel), &val);
res = regmap_write(data->regmap, MAX6639_REG_THERM_LIMIT(channel),
err = regmap_write(data->regmap, MAX6639_REG_THERM_LIMIT(i), 80);