ARM: dts: enable pwm backlight for exynos5250-snow

Add PWM backlight node for exynos5250 based snow board.
Signed-off-by: NOlof Johansson <olof@lixom.net>
Signed-off-by: NAjay Kumar <ajaykumar.rs@samsung.com>
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>

arch/arm/boot/dts/exynos5250-snow.dts

@@ -387,4 +387,14 @@
 		vdd_osc-supply = <&ldo10_reg>;
 		vdd_pll-supply = <&ldo8_reg>;
 	};
+
+	backlight {
+		compatible = "pwm-backlight";
+		pwms = <&pwm 0 1000000 0>;
+		brightness-levels = <0 100 500 1000 1500 2000 2500 2800>;
+		default-brightness-level = <7>;
+		pinctrl-0 = <&pwm0_out>;
+		pinctrl-names = "default";
+	};
+
 };