ARM: dts: imx6qdl-gw54xx: add CAN regulator

The GW54xx has a transceiver with a STBY pin connected to an IMX6 GPIO.
Configure this as a regulator to drive it low when CAN is in use.
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6qdl-gw54xx.dtsi

@@ -137,6 +137,16 @@ reg_3p3v: regulator@1 {
 			regulator-always-on;
 		};
 
+		reg_can1_stby: regulator-can1-stby {
+			compatible = "regulator-fixed";
+			pinctrl-names = "default";
+			pinctrl-0 = <&pinctrl_reg_can1>;
+			regulator-name = "can1_stby";
+			gpio = <&gpio1 2 GPIO_ACTIVE_LOW>;
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+		};
+
 		reg_usb_h1_vbus: regulator@2 {
 			compatible = "regulator-fixed";
 			reg = <2>;
@@ -200,6 +210,7 @@ IMX_AUDMUX_V2_PTCR_SYN
 &can1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_flexcan1>;
+	xceiver-supply = <&reg_can1_stby>;
 	status = "okay";
 };
 
@@ -687,7 +698,6 @@ pinctrl_flexcan1: flexcan1grp {
 		fsl,pins = <
 			MX6QDL_PAD_KEY_ROW2__FLEXCAN1_RX	0x1b0b1
 			MX6QDL_PAD_KEY_COL2__FLEXCAN1_TX	0x1b0b1
-			MX6QDL_PAD_GPIO_2__GPIO1_IO02		0x4001b0b0 /* CAN_STBY */
 		>;
 	};
 
@@ -786,6 +796,12 @@ MX6QDL_PAD_SD4_DAT2__PWM4_OUT		0x1b0b1
 		>;
 	};
 
+	pinctrl_reg_can1: regcan1grp {
+		fsl,pins = <
+			MX6QDL_PAD_GPIO_2__GPIO1_IO02		0x4001b0b0 /* CAN_STBY */
+		>;
+	};
+
 	pinctrl_uart1: uart1grp {
 		fsl,pins = <
 			MX6QDL_PAD_SD3_DAT7__UART1_TX_DATA	0x1b0b1