mfd: axp20x: Add ADC cells for AXP20X and AXP22X PMICs

This adds the AXP20X/AXP22x ADCs driver to the mfd cells of the AXP209,
AXP221 and AXP223 MFD.
Signed-off-by: NQuentin Schulz <quentin.schulz@free-electrons.com>
Acked-by: NMaxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: NChen-Yu Tsai <wens@csie.org>
Signed-off-by: NLee Jones <lee.jones@linaro.org>

drivers/mfd/axp20x.c

@@ -589,6 +589,8 @@ static struct mfd_cell axp20x_cells[] = {
 		.resources	= axp20x_pek_resources,
 	}, {
 		.name		= "axp20x-regulator",
+	}, {
+		.name		= "axp20x-adc",
 	}, {
 		.name		= "axp20x-ac-power-supply",
 		.of_compatible	= "x-powers,axp202-ac-power-supply",
@@ -609,6 +611,8 @@ static struct mfd_cell axp221_cells[] = {
 		.resources	= axp22x_pek_resources,
 	}, {
 		.name		= "axp20x-regulator",
+	}, {
+		.name		= "axp22x-adc"
 	}, {
 		.name		= "axp20x-usb-power-supply",
 		.of_compatible	= "x-powers,axp221-usb-power-supply",
@@ -622,6 +626,8 @@ static struct mfd_cell axp223_cells[] = {
 		.name			= "axp20x-pek",
 		.num_resources		= ARRAY_SIZE(axp22x_pek_resources),
 		.resources		= axp22x_pek_resources,
+	}, {
+		.name		= "axp22x-adc",
 	}, {
 		.name			= "axp20x-regulator",
 	}, {