ARM: dts: exynos5422-odroidxu3: Hook up PWM and use it for LEDs

PWM output wasn't working because it wasn't hooked up to its pincontrol.
This patch:
   - hooks up PWM to its pincontrol, and documents what
     the outputs are on the XU3
   - switches the LEDs that are on PWM outputs to use PWM
     rather than GPIO.

The main effect is that the brightness of the LEDs can be controlled, and
user-mode fan control is enabled via /sys/class/pwm
Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Peter Chubb <peter.chubb@nicta.com.au>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>

arch/arm/boot/dts/exynos5422-odroidxu3.dts

@@ -285,25 +285,35 @@ hdmiddc@50 {
 		};
 	};
 
-	leds {
-		compatible = "gpio-leds";
-		heartbeat {
-			label = "blue:heartbeart";
-			gpios = <&gpb2 2 0>;
-			default-state = "off";
-			linux,default-trigger = "heartbeat";
+	pwmleds {
+		compatible = "pwm-leds";
+
+		greenled {
+			label = "green:mmc0";
+			pwms = <&pwm 1 2000000 0>;
+			pwm-names = "pwm1";
+			/*
+			 * Green LED is much brighter than the others
+			 * so limit its max brightness
+			 */
+			max_brightness = <127>;
+			linux,default-trigger = "mmc0";
 		};
 
-		eMMC {
-			label = "green:eMMC";
-			gpios = <&gpb2 1 0>;
-			default-state = "off";
-			linux,default-trigger = "mmc0";
+		blueled {
+			label = "blue:heartbeat";
+			pwms = <&pwm 2 2000000 0>;
+			pwm-names = "pwm2";
+			max_brightness = <255>;
+			linux,default-trigger = "heartbeat";
 		};
+	};
 
-		microSD {
+	gpioleds {
+		compatible = "gpio-leds";
+		redled {
 			label = "red:microSD";
-			gpios = <&gpx2 3 0>;
+			gpios = <&gpx2 3 GPIO_ACTIVE_HIGH>;
 			default-state = "off";
 			linux,default-trigger = "mmc1";
 		};
@@ -472,6 +482,18 @@ ina231@45 {
 	};
 };
 
+&pwm {
+	/*
+	 * PWM 0 -- fan
+	 * PWM 1 -- Green LED
+	 * PWM 2 -- Blue LED
+	 * PWM 3 -- on MIPI connector for backlight
+	 */
+	pinctrl-0 = <&pwm0_out &pwm1_out &pwm2_out &pwm3_out>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
 &rtc {
 	status = "okay";
 	clocks = <&clock CLK_RTC>, <&s2mps11_osc S2MPS11_CLK_AP>;