dt-bindings: leds: Add LED bindings for the LM36274

Add the LM36274 LED specific bindings.

Signed-off-by: Dan Murphy <dmurphy@ti.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>

diff --git a/Documentation/devicetree/bindings/leds/leds-lm36274.txt b/Documentation/devicetree/bindings/leds/leds-lm36274.txt
new file mode 100644 (file)
index 0000000..456a589
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+* Texas Instruments LM36274 4-Channel LCD Backlight Driver w/Integrated Bias
+
+The LM36274 is an integrated four-channel WLED driver and LCD bias supply.
+The backlight boost provides the power to bias four parallel LED strings with
+up to 29V total output voltage. The 11-bit LED current is programmable via
+the I2C bus and/or controlled via a logic level PWM input from 60 uA to 30 mA.
+
+Parent device properties are documented in
+Documentation/devicetree/bindings/mfd/ti_lmu.txt
+
+Regulator properties are documented in
+Documentation/devicetree/bindings/regulator/lm363x-regulator.txt
+
+Required backlight properties:
+       - compatible:
+               "ti,lm36274-backlight"
+       - reg : 0
+       - #address-cells : 1
+       - #size-cells : 0
+       - led-sources : Indicates which LED strings will be enabled.
+                       Values from 0-3, sources is 0 based so strings will be
+                       source value + 1.
+
+Optional backlight properties:
+       - label : see Documentation/devicetree/bindings/leds/common.txt
+       - linux,default-trigger :
+          see Documentation/devicetree/bindings/leds/common.txt
+
+Example:
+
+HVLED string 1 and 3 are controlled by control bank A and HVLED 2 string is
+controlled by control bank B.
+
+lm36274@11 {
+       compatible = "ti,lm36274";
+       #address-cells = <1>;
+       #size-cells = <0>;
+       reg = <0x11>;
+
+       enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
+
+       regulators {
+               #address-cells = <1>;
+               #size-cells = <0>;
+               compatible = "ti,lm363x-regulator";
+
+               enable-gpios = <&pioC 0 GPIO_ACTIVE_HIGH>,
+                              <&pioC 1 GPIO_ACTIVE_HIGH>;
+
+               vboost {
+                       regulator-name = "lcd_boost";
+                       regulator-min-microvolt = <4000000>;
+                       regulator-max-microvolt = <7150000>;
+                       regulator-always-on;
+               };
+
+               vpos {
+                       regulator-name = "lcd_vpos";
+                       regulator-min-microvolt = <4000000>;
+                       regulator-max-microvolt = <6500000>;
+               };
+
+               vneg {
+                       regulator-name = "lcd_vneg";
+                       regulator-min-microvolt = <4000000>;
+                       regulator-max-microvolt = <6500000>;
+               };
+       };
+
+       backlight {
+               #address-cells = <1>;
+               #size-cells = <0>;
+               compatible = "ti,lm36274-backlight";
+
+               led@0 {
+                       reg = <0>;
+                       led-sources = <0 2>;
+                       label = "white:backlight_cluster";
+                       linux,default-trigger = "backlight";
+               };
+       };
+};
+
+For more product information please see the link below:
+http://www.ti.com/lit/ds/symlink/lm36274.pdf