ARM: dts: imx: add LVDS backlight for Ventana

The GW54xx/GW53xx/GW52xx all support LVDS with a PWM controlled backlight.
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>

arch/arm/boot/dts/imx6qdl-gw52xx.dtsi

@@ -27,6 +27,13 @@ chosen {
 		bootargs = "console=ttymxc1,115200";
 	};
 
+	backlight {
+		compatible = "pwm-backlight";
+		pwms = <&pwm4 0 5000000>;
+		brightness-levels = <0 4 8 16 32 64 128 255>;
+		default-brightness-level = <7>;
+	};
+
 	leds {
 		compatible = "gpio-leds";
 
@@ -399,6 +406,12 @@ MX6QDL_PAD_GPIO_6__I2C3_SDA		0x4001b8b1
 			>;
 		};
 
+		pinctrl_pwm4: pwm4grp {
+			fsl,pins = <
+				MX6QDL_PAD_SD1_CMD__PWM4_OUT		0x1b0b1
+			>;
+		};
+
 		pinctrl_uart1: uart1grp {
 			fsl,pins = <
 				MX6QDL_PAD_SD3_DAT7__UART1_TX_DATA	0x1b0b1
@@ -448,6 +461,12 @@ &pcie {
 	status = "okay";
 };
 
+&pwm4 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_pwm4>;
+	status = "okay";
+};
+
 &ssi1 {
 	fsl,mode = "i2s-slave";
 	status = "okay";

arch/arm/boot/dts/imx6qdl-gw53xx.dtsi

@@ -30,6 +30,13 @@ chosen {
 		bootargs = "console=ttymxc1,115200";
 	};
 
+	backlight {
+		compatible = "pwm-backlight";
+		pwms = <&pwm4 0 5000000>;
+		brightness-levels = <0 4 8 16 32 64 128 255>;
+		default-brightness-level = <7>;
+	};
+
 	leds {
 		compatible = "gpio-leds";
 
@@ -439,6 +446,12 @@ MX6QDL_PAD_GPIO_6__I2C3_SDA		0x4001b8b1
 			>;
 		};
 
+		pinctrl_pwm4: pwm4grp {
+			fsl,pins = <
+				MX6QDL_PAD_SD1_CMD__PWM4_OUT		0x1b0b1
+			>;
+		};
+
 		pinctrl_uart1: uart1grp {
 			fsl,pins = <
 				MX6QDL_PAD_SD3_DAT7__UART1_TX_DATA	0x1b0b1
@@ -513,6 +526,12 @@ eth1: sky2@8 { /* MAC/PHY on bus 8 */
 	};
 };
 
+&pwm4 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_pwm4>;
+	status = "okay";
+};
+
 &ssi1 {
 	fsl,mode = "i2s-slave";
 	status = "okay";

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

@@ -30,6 +30,13 @@ chosen {
 		bootargs = "console=ttymxc1,115200";
 	};
 
+	backlight {
+		compatible = "pwm-backlight";
+		pwms = <&pwm4 0 5000000>;
+		brightness-levels = <0 4 8 16 32 64 128 255>;
+		default-brightness-level = <7>;
+	};
+
 	leds {
 		compatible = "gpio-leds";
 
@@ -461,6 +468,12 @@ MX6QDL_PAD_GPIO_6__I2C3_SDA		0x4001b8b1
 			>;
 		};
 
+		pinctrl_pwm4: pwm4grp {
+			fsl,pins = <
+				MX6QDL_PAD_SD1_CMD__PWM4_OUT		0x1b0b1
+			>;
+		};
+
 		pinctrl_uart1: uart1grp {
 			fsl,pins = <
 				MX6QDL_PAD_SD3_DAT7__UART1_TX_DATA	0x1b0b1
@@ -535,6 +548,12 @@ eth1: sky2@8 { /* MAC/PHY on bus 8 */
 	};
 };
 
+&pwm4 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_pwm4>;
+	status = "okay";
+};
+
 &ssi1 {
 	fsl,mode = "i2s-slave";
 	status = "okay";