power: supply: max17042_battery: Add support for the VOLT_MIN property

The info is there, so lets export it, like we already do for VOLT_MAX.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>

drivers/power/supply/max17042_battery.c

@@ -81,6 +81,7 @@ static enum power_supply_property max17042_battery_props[] = {
 	POWER_SUPPLY_PROP_TECHNOLOGY,
 	POWER_SUPPLY_PROP_CYCLE_COUNT,
 	POWER_SUPPLY_PROP_VOLTAGE_MAX,
+	POWER_SUPPLY_PROP_VOLTAGE_MIN,
 	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
 	POWER_SUPPLY_PROP_VOLTAGE_AVG,
@@ -257,6 +258,13 @@ static int max17042_get_property(struct power_supply *psy,
 		val->intval = data >> 8;
 		val->intval *= 20000; /* Units of LSB = 20mV */
 		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
+		ret = regmap_read(map, MAX17042_MinMaxVolt, &data);
+		if (ret < 0)
+			return ret;
+
+		val->intval = (data & 0xff) * 20000; /* Units of 20mV */
+		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 		if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
 			ret = regmap_read(map, MAX17042_V_empty, &data);