apf27dev: add max5821 to the dts

Signed-off-by: Philippe Reynes <tremyfr@gmail.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/imx27-apf27dev.dts

@@ -59,6 +59,21 @@ user {
 			linux,default-trigger = "heartbeat";
 		};
 	};
+
+	regulators {
+		compatible = "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		reg_max5821: regulator@0 {
+			compatible = "regulator-fixed";
+			reg = <0>;
+			regulator-name = "max5821-reg";
+			regulator-min-microvolt = <2500000>;
+			regulator-max-microvolt = <2500000>;
+			regulator-always-on;
+		};
+	};
 };
 
 &cspi1 {
@@ -107,6 +122,12 @@ rtc@68 {
 		compatible = "dallas,ds1374";
 		reg = <0x68>;
 	};
+
+	max5821@38 {
+		compatible = "maxim,max5821";
+		reg = <0x38>;
+		vref-supply = <&reg_max5821>;
+	};
 };
 
 &i2c2 {