[PATCH 5/5] ARM: dts: sun6i: add pwm backlight for reference design tablet

[Icenowy Zheng <icenowy-ymACFijhrKM@public.gmane.org>]

The reference tablet design of sun6i uses pwm0 to control the backlight.

As we have PWM support for sun6i now, enable the backlight control.

Signed-off-by: Icenowy Zheng <icenowy-ymACFijhrKM@public.gmane.org>
---
 .../boot/dts/sun6i-reference-design-tablet.dtsi    | 24 ++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/arch/arm/boot/dts/sun6i-reference-design-tablet.dtsi b/arch/arm/boot/dts/sun6i-reference-design-tablet.dtsi
index c3fcf16..aa96acf 100644
--- a/arch/arm/boot/dts/sun6i-reference-design-tablet.dtsi
+++ b/arch/arm/boot/dts/sun6i-reference-design-tablet.dtsi
@@ -45,6 +45,7 @@
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/input/input.h>
 #include <dt-bindings/pinctrl/sun4i-a10.h>
+#include <dt-bindings/pwm/pwm.h>
 
 / {
 	aliases {
@@ -54,6 +55,16 @@
 	chosen {
 		stdout-path = "serial0:115200n8";
 	};
+
+	backlight: backlight {
+		compatible = "pwm-backlight";
+		pinctrl-names = "default";
+		pinctrl-0 = <&bl_en_pin>;
+		pwms = <&pwm0 0 50000 PWM_POLARITY_INVERTED>;
+		brightness-levels = <0 10 20 30 40 50 60 70 80 90 100>;
+		default-brightness-level = <8>;
+		enable-gpios = <&pio 0 25 GPIO_ACTIVE_HIGH>; /* PA25 */
+	};
 };
 
 &cpu0 {
@@ -76,6 +87,13 @@
 };
 
 &pio {
+	bl_en_pin: bl_en_pin@0 {
+		allwinner,pins = "PA25";
+		allwinner,function = "gpio_in";
+		allwinner,drive = <SUN4I_PINCTRL_10_MA>;
+		allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
+	};
+
 	mmc0_cd_pin_e708_q1: mmc0_cd_pin@0 {
 		allwinner,pins = "PA8";
 		allwinner,function = "gpio_in";
@@ -91,6 +109,12 @@
 	};
 };
 
+&pwm0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pwm0_pins>;
+	status = "okay";
+};
+
 &p2wi {
 	status = "okay";
 
-- 
2.10.1