mfd: axp20x: Add MFD cells for AXP20X and AXP22X battery driver

The X-Powers AXP20X and AXP22X PMICs can have a battery as power supply.

This patch adds the AXP20X/AXP22X battery driver to the MFD cells of the
AXP209, AXP221 and AXP223 MFD.
Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/axp20x.c

@@ -593,6 +593,9 @@ static struct mfd_cell axp20x_cells[] = {
 		.name		= "axp20x-regulator",
 	}, {
 		.name		= "axp20x-adc",
+	}, {
+		.name		= "axp20x-battery-power-supply",
+		.of_compatible	= "x-powers,axp209-battery-power-supply",
 	}, {
 		.name		= "axp20x-ac-power-supply",
 		.of_compatible	= "x-powers,axp202-ac-power-supply",
@@ -620,6 +623,9 @@ static struct mfd_cell axp221_cells[] = {
 		.of_compatible	= "x-powers,axp221-ac-power-supply",
 		.num_resources	= ARRAY_SIZE(axp20x_ac_power_supply_resources),
 		.resources	= axp20x_ac_power_supply_resources,
+	}, {
+		.name		= "axp20x-battery-power-supply",
+		.of_compatible	= "x-powers,axp221-battery-power-supply",
 	}, {
 		.name		= "axp20x-usb-power-supply",
 		.of_compatible	= "x-powers,axp221-usb-power-supply",
@@ -635,6 +641,9 @@ static struct mfd_cell axp223_cells[] = {
 		.resources		= axp22x_pek_resources,
 	}, {
 		.name		= "axp22x-adc",
+	}, {
+		.name		= "axp20x-battery-power-supply",
+		.of_compatible	= "x-powers,axp221-battery-power-supply",
 	}, {
 		.name			= "axp20x-regulator",
 	}, {