ARM: dts: mxs: add pwm-backlight for imx23-evk and imx28-evk

Add pwm device and pwm-backlight for imx23-evk and imx28-evk.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/imx23-evk.dts

@@ -51,6 +51,12 @@
 		};
 
 		apbx@80040000 {
+			pwm: pwm@80064000 {
+				pinctrl-names = "default";
+				pinctrl-0 = <&pwm2_pins_a>;
+				status = "okay";
+			};
+
 			auart0: serial@8006c000 {
 				pinctrl-names = "default";
 				pinctrl-0 = <&auart0_pins_a>;
@@ -76,4 +82,11 @@
 			gpio = <&gpio1 29 0>;
 		};
 	};
+
+	backlight {
+		compatible = "pwm-backlight";
+		pwms = <&pwm 2 5000000>;
+		brightness-levels = <0 4 8 16 32 64 128 255>;
+		default-brightness-level = <6>;
+	};
 };

arch/arm/boot/dts/imx23.dtsi

@@ -181,6 +181,16 @@
 					>;
 					fsl,pull-up = <0>;
 				};
+
+				pwm2_pins_a: pwm2@0 {
+					reg = <0>;
+					fsl,pinmux-ids = <
+						0x11c0 /* MX23_PAD_PWM2__PWM2 */
+					>;
+					fsl,drive-strength = <0>;
+					fsl,voltage = <1>;
+					fsl,pull-up = <0>;
+				};
 			};
 
 			digctl@8001c000 {
@@ -294,8 +304,11 @@
 				interrupts = <22>;
 			};
 
-			pwm@80064000 {
+			pwm: pwm@80064000 {
+				compatible = "fsl,imx23-pwm";
 				reg = <0x80064000 2000>;
+				#pwm-cells = <2>;
+				fsl,pwm-number = <5>;
 				status = "disabled";
 			};
 

arch/arm/boot/dts/imx28-evk.dts

@@ -95,6 +95,12 @@
 				};
 			};
 
+			pwm: pwm@80064000 {
+				pinctrl-names = "default";
+				pinctrl-0 = <&pwm2_pins_a>;
+				status = "okay";
+			};
+
 			duart: serial@80074000 {
 				pinctrl-names = "default";
 				pinctrl-0 = <&duart_pins_a>;
@@ -179,4 +185,11 @@
 			linux,default-trigger = "heartbeat";
 		};
 	};
+
+	backlight {
+		compatible = "pwm-backlight";
+		pwms = <&pwm 2 5000000>;
+		brightness-levels = <0 4 8 16 32 64 128 255>;
+		default-brightness-level = <6>;
+	};
 };

arch/arm/boot/dts/imx28.dtsi

@@ -364,6 +364,16 @@
 					fsl,voltage = <1>;
 					fsl,pull-up = <1>;
 				};
+
+				pwm2_pins_a: pwm2@0 {
+					reg = <0>;
+					fsl,pinmux-ids = <
+						0x3120 /* MX28_PAD_PWM2__PWM_2 */
+					>;
+					fsl,drive-strength = <0>;
+					fsl,voltage = <1>;
+					fsl,pull-up = <0>;
+				};
 			};
 
 			digctl@8001c000 {
@@ -526,8 +536,11 @@
 				status = "disabled";
 			};
 
-			pwm@80064000 {
+			pwm: pwm@80064000 {
+				compatible = "fsl,imx28-pwm", "fsl,imx23-pwm";
 				reg = <0x80064000 2000>;
+				#pwm-cells = <2>;
+				fsl,pwm-number = <8>;
 				status = "disabled";
 			};