ARM: dts: imx7-colibri: add Carrier Board 3.3V/5V regulators

Model the Carrier Board power distribution by adding a fixed 3.3V
and 5V regulator. The 3.3V regulator is connected to the backlight
as well as the display supply. The 5V regulator is used to supply
USB VBUS.
Signed-off-by: NStefan Agner <stefan@agner.ch>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx7-colibri-eval-v3.dtsi

@@ -48,6 +48,7 @@
 	panel: panel {
 		compatible = "edt,et057090dhu";
 		backlight = <&bl>;
+		power-supply = <&reg_3v3>;
 
 		port {
 			panel_in: endpoint {
@@ -55,11 +56,27 @@
 			};
 		};
 	};
+
+	reg_3v3: regulator-3v3 {
+		compatible = "regulator-fixed";
+		regulator-name = "3.3V";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+	};
+
+	reg_5v0: regulator-5v0 {
+		compatible = "regulator-fixed";
+		regulator-name = "5V";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+	};
 };
 
 &bl {
 	brightness-levels = <0 4 8 16 32 64 128 255>;
 	default-brightness-level = <6>;
+	power-supply = <&reg_3v3>;
+
 	status = "okay";
 };
 

arch/arm/boot/dts/imx7d-colibri-eval-v3.dts

@@ -57,6 +57,7 @@
 		regulator-min-microvolt = <5000000>;
 		regulator-max-microvolt = <5000000>;
 		gpio = <&gpio4 7 GPIO_ACTIVE_LOW>;
+		vin-supply = <&reg_5v0>;
 	};
 };