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+Regulator of AMS AS3722 PMIC.
+Name of the regulator subnode must be "regulators".
+
+Optional properties:
+--------------------
+The input supply of regulators are the optional properties on the
+regulator node. The AS3722 is having 7 DCDC step-down regulators as
+sd[0-6], 10 LDOs as ldo[0-7], ldo[9-11]. The input supply of these
+regulators are provided through following properties:
+vsup-sd2-supply: Input supply for SD2.
+vsup-sd3-supply: Input supply for SD3.
+vsup-sd4-supply: Input supply for SD4.
+vsup-sd5-supply: Input supply for SD5.
+vin-ldo0-supply: Input supply for LDO0.
+vin-ldo1-6-supply: Input supply for LDO1 and LDO6.
+vin-ldo2-5-7-supply: Input supply for LDO2, LDO5 and LDO7.
+vin-ldo3-4-supply: Input supply for LDO3 and LDO4.
+vin-ldo9-10-supply: Input supply for LDO9 and LDO10.
+vin-ldo11-supply: Input supply for LDO11.
+
+Optional nodes:
+--------------
+- regulators : Must contain a sub-node per regulator from the list below.
+	       Each sub-node should contain the constraints and initialization
+	       information for that regulator. See regulator.txt for a
+	       description of standard properties for these sub-nodes.
+	       Additional custom properties  are listed below.
+	       sd[0-6], ldo[0-7], ldo[9-11].
+
+	       Optional sub-node properties:
+	       ----------------------------
+		ams,ext-control: External control of the rail. The option of
+			this properties will tell which external input is
+			controlling this rail. Valid values are 0, 1, 2 ad 3.
+			0: There is no external control of this rail.
+			1: Rail is controlled by ENABLE1 input pin.
+			2: Rail is controlled by ENABLE2 input pin.
+			3: Rail is controlled by ENABLE3 input pin.
+		ams,enable-tracking: Enable tracking with SD1, only supported
+			by LDO3.
+
+Example:
+-------
+	ams3722: ams3722 {
+		compatible = "ams,as3722";
+		reg = <0x40>;
+		...
+
+		regulators {
+			vsup-sd2-supply = <...>;
+			...
+
+			sd0 {
+				regulator-name = "vdd_cpu";
+				regulator-min-microvolt = <700000>;
+				regulator-max-microvolt = <1400000>;
+				regulator-always-on;
+				ams,ext-control = <2>;
+			};
+
+			sd1 {
+				regulator-name = "vdd_core";
+				regulator-min-microvolt = <700000>;
+				regulator-max-microvolt = <1400000>;
+				regulator-always-on;
+				ams,ext-control = <1>;
+			};
+
+			sd2 {
+				regulator-name = "vddio_ddr";
+				regulator-min-microvolt = <1350000>;
+				regulator-max-microvolt = <1350000>;
+				regulator-always-on;
+			};
+
+			sd4 {
+				regulator-name = "avdd-hdmi-pex";
+				regulator-min-microvolt = <1050000>;
+				regulator-max-microvolt = <1050000>;
+				regulator-always-on;
+			};
+
+			sd5 {
+				regulator-name = "vdd-1v8";
+				regulator-min-microvolt = <1800000>;
+				regulator-max-microvolt = <1800000>;
+				regulator-always-on;
+			};
+			....
+		};
+	};