ARM: dts: add STMPE PWM to the NHK15 device tree

This adds the STMPE PWM to the NHK15 device tree.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/boot/dts/ste-nomadik-nhk15.dts

@@ -140,6 +140,10 @@ stmpe_keypad {
 						0x03020067 // Up
 						0x0303006c>; // Down
 			};
+			stmpe0_pwm: stmpe_pwm {
+				compatible = "st,stmpe-pwm";
+				#pwm-cells = <2>;
+			};
 		};
 		stmpe1: stmpe2401@44 {
 			compatible = "st,stmpe2401";
@@ -183,4 +187,24 @@ mmcsd: sdi@101f6000 {
 			wp-gpios = <&stmpe_gpio44 18 GPIO_ACTIVE_HIGH>;
 		};
 	};
+
+	bl: backlight {
+		compatible = "pwm-backlight";
+		pwms = <&stmpe0_pwm 0 500000>;
+		pwm-names = "backlight";
+		brightness-levels = <
+			0  1  2  3  4  5  6  7  8  9
+			10 11 12 13 14 15 16 17 18 19
+			20 21 22 23 24 25 26 27 28 29
+			30 31 32 33 34 35 36 37 38 39
+			40 41 42 43 44 45 46 47 48 49
+			50 51 52 53 54 55 56 57 58 59
+			60 61 62 63 64 65 66 67 68 69
+			70 71 72 73 74 75 76 77 78 79
+			80 81 82 83 84 85 86 87 88 89
+			90 91 92 93 94 95 96 97 98 99
+			100
+		>;
+		default-brightness-level = <100>;
+	};
 };