ARM: dts: exynos: Add ADCs on 4412 and 5422 based odroid boards.

Odroid-X, -X2, -XU3 and -XU4 have SOC-ADC routed to an external connector.
Enable the ADC for use as iio-device.
Signed-off-by: Markus Reichl <m.reichl@fivetechno.de>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

arch/arm/boot/dts/exynos4412-odroidx.dts

@@ -64,6 +64,11 @@ regulator_p3v3 {
 	};
 };
 
+&adc {
+	vdd-supply = <&ldo10_reg>;
+	status = "okay";
+};
+
 /* VDDQ for MSHC (eMMC card) */
 &buck8_reg {
 	regulator-name = "BUCK8_VDDQ_MMC4_2.8V";

arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi

@@ -147,6 +147,11 @@ map6 {
 	};
 };
 
+&adc {
+	vdd-supply = <&ldo4_reg>;
+	status = "okay";
+};
+
 &bus_wcore {
 	devfreq-events = <&nocp_mem0_0>, <&nocp_mem0_1>,
 			<&nocp_mem1_0>, <&nocp_mem1_1>;
@@ -293,6 +298,12 @@ ldo3_reg: LDO3 {
 				regulator-max-microvolt = <1800000>;
 			};
 
+			ldo4_reg: LDO4 {
+				regulator-name = "vdd_adc";
+				regulator-min-microvolt = <1800000>;
+				regulator-max-microvolt = <1800000>;
+			};
+
 			ldo5_reg: LDO5 {
 				regulator-name = "vdd_ldo5";
 				regulator-min-microvolt = <1800000>;