ARM: dts: imx6qdl-wandboard: enable USB OTG

Enable USB OTG (dual-role) on the Wandboard.
Note, that the USB_OTG_VBUS current is quite limited due to a 22R resistor
in the power line. Hence, the overcurrent signal of 1A will never be
triggered on this board.
Signed-off-by: Alexander Kurz <akurz@blala.de>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6qdl-wandboard.dtsi

@@ -44,6 +44,16 @@ reg_3p3v: regulator-3p3v {
 		regulator-max-microvolt = <3300000>;
 		regulator-always-on;
 	};
+
+	reg_usb_otg_vbus: regulator-usbotgvbus {
+		compatible = "regulator-fixed";
+		regulator-name = "usb_otg_vbus";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_usbotgvbus>;
+		gpio = <&gpio3 22 GPIO_ACTIVE_LOW>;
+	};
 };
 
 &audmux {
@@ -166,6 +176,12 @@ MX6QDL_PAD_GPIO_1__USB_OTG_ID		0x17059
 			>;
 		};
 
+		pinctrl_usbotgvbus: usbotgvbusgrp {
+			fsl,pins = <
+				MX6QDL_PAD_EIM_D22__GPIO3_IO22		0x130b0
+			>;
+		};
+
 		pinctrl_usdhc1: usdhc1grp {
 			fsl,pins = <
 				MX6QDL_PAD_SD1_CMD__SD1_CMD		0x17059
@@ -240,10 +256,11 @@ &usbh1 {
 };
 
 &usbotg {
+	vbus-supply = <&reg_usb_otg_vbus>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_usbotg>;
 	disable-over-current;
-	dr_mode = "peripheral";
+	dr_mode = "otg";
 	status = "okay";
 };