dt-bindings: backlight: arcxcnn: Supply bindings for Arctic Sand backlight

Signed-off-by: Olimpiu Dejeu <olimpiu@arcticsand.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/Documentation/devicetree/bindings/leds/backlight/arcxcnn_bl.txt b/Documentation/devicetree/bindings/leds/backlight/arcxcnn_bl.txt
new file mode 100644 (file)
index 0000000..230abde
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+Binding for ArcticSand arc2c0608 LED driver
+
+Required properties:
+- compatible:          should be "arc,arc2c0608"
+- reg:                 slave address
+
+Optional properties:
+- default-brightness:  brightness value on boot, value from: 0-4095
+- label:               The name of the backlight device
+                       See Documentation/devicetree/bindings/leds/common.txt
+- led-sources:         List of enabled channels from 0 to 5.
+                       See Documentation/devicetree/bindings/leds/common.txt
+
+- arc,led-config-0:    setting for register ILED_CONFIG_0
+- arc,led-config-1:    setting for register ILED_CONFIG_1
+- arc,dim-freq:                PWM mode frequence setting (bits [3:0] used)
+- arc,comp-config:     setting for register CONFIG_COMP
+- arc,filter-config:   setting for register FILTER_CONFIG
+- arc,trim-config:     setting for register IMAXTUNE
+
+Note: Optional properties not specified will default to values in IC EPROM
+
+Example:
+
+arc2c0608@30 {
+       compatible = "arc,arc2c0608";
+       reg = <0x30>;
+       default-brightness = <500>;
+       label = "lcd-backlight";
+       linux,default-trigger = "backlight";
+       led-sources = <0 1 2 5>;
+};
+