devicetree: Add new SKY81452 backlight binding

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
Acked-by: Bryan Wu <cooloney@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt b/Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt
new file mode 100644 (file)
index 0000000..8bf2940
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+++ b/Documentation/devicetree/bindings/video/backlight/sky81452-backlight.txt
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+SKY81452-backlight bindings
+
+Required properties:
+- compatible           : Must be "skyworks,sky81452-backlight"
+
+Optional properties:
+- name                 : Name of backlight device. Default is 'lcd-backlight'.
+- gpios                        : GPIO to use to EN pin.
+                       See Documentation/devicetree/bindings/gpio/gpio.txt
+- led-sources          : List of enabled channels from 0 to 5.
+                       See Documentation/devicetree/bindings/leds/common.txt
+- skyworks,ignore-pwm  : Ignore both PWM input
+- skyworks,dpwm-mode   : Enable DPWM dimming mode, otherwise Analog dimming.
+- skyworks,phase-shift : Enable phase shift mode
+- skyworks,short-detection-threshold-volt
+                       : It should be one of 4, 5, 6 and 7V.
+- skyworks,current-limit-mA
+                       : It should be 2300mA or 2750mA.
+
+Example:
+
+       backlight {
+               compatible = "skyworks,sky81452-backlight";
+               name = "pwm-backlight";
+               led-sources = <0 1 2 5>;
+               skyworks,ignore-pwm;
+               skyworks,phase-shift;
+               skyworks,current-limit-mA = <2300>;
+       };