ARM: dts: imx6sx-sdb: add flexcan support

CAN transceiver is different on RevA and RevB board.
It's active high on RevA while active low on Rev B.
Signed-off-by: NAisheng Dong <aisheng.dong@nxp.com>
Signed-off-by: NJoakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6sx-sdb-reva.dts

@@ -138,3 +138,15 @@
 		spi-max-frequency = <66000000>;
 	};
 };
+
+&reg_can_en {
+	/* Transceiver EN/STBY is active high on RevA board */
+	gpio = <&gpio4 25 GPIO_ACTIVE_HIGH>;
+	enable-active-high;
+};
+
+&reg_can_stby {
+	gpio = <&gpio4 27 GPIO_ACTIVE_HIGH>;
+	enable-active-high;
+	vin-supply = <&reg_can_en>;
+};

arch/arm/boot/dts/imx6sx-sdb.dts

@@ -132,3 +132,8 @@
 &reg_soc {
 	vin-supply = <&sw1a_reg>;
 };
+
+&reg_can_stby {
+	/* Transceiver EN/STBY is active low on RevB board */
+	gpio = <&gpio4 27 GPIO_ACTIVE_LOW>;
+};

arch/arm/boot/dts/imx6sx-sdb.dtsi

@@ -135,6 +135,20 @@
 		regulator-max-microvolt = <5000000>;
 	};
 
+	reg_can_en: regulator-can-en {
+		compatible = "regulator-fixed";
+		regulator-name = "can-en";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+	};
+
+	reg_can_stby: regulator-can-stby {
+		compatible = "regulator-fixed";
+		regulator-name = "can-stby";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+	};
+
 	sound {
 		compatible = "fsl,imx6sx-sdb-wm8962", "fsl,imx-audio-wm8962";
 		model = "wm8962-audio";
@@ -201,6 +215,20 @@
 	status = "okay";
 };
 
+&flexcan1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_flexcan1>;
+	xceiver-supply = <&reg_can_stby>;
+	status = "okay";
+};
+
+&flexcan2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_flexcan2>;
+	xceiver-supply = <&reg_can_stby>;
+	status = "okay";
+};
+
 &i2c3 {
 	clock-frequency = <100000>;
 	pinctrl-names = "default";
@@ -396,6 +424,20 @@
 			>;
 		};
 
+		pinctrl_flexcan1: flexcan1grp {
+			fsl,pins = <
+				MX6SX_PAD_QSPI1B_DQS__CAN1_TX		0x1b020
+				MX6SX_PAD_QSPI1A_SS1_B__CAN1_RX		0x1b020
+			>;
+		};
+
+		pinctrl_flexcan2: flexcan2grp {
+			fsl,pins = <
+				MX6SX_PAD_QSPI1B_SS1_B__CAN2_RX		0x1b020
+				MX6SX_PAD_QSPI1A_DQS__CAN2_TX		0x1b020
+			>;
+		};
+
 		pinctrl_gpio_keys: gpio_keysgrp {
 			fsl,pins = <
 				MX6SX_PAD_CSI_DATA04__GPIO1_IO_18 0x17059