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authorDan Murphy <dmurphy@ti.com>2019-06-05 07:56:33 -0500
committerJacek Anaszewski <jacek.anaszewski@gmail.com>2019-06-07 20:40:06 +0200
commit04f4dc1bc5f0f64640026497f97e2f3c063f7831 (patch)
treefa692d7c3d8969899fb954df8094b7c12b21e35e /Documentation/devicetree/bindings/leds/leds-lm36274.txt
parentbff5e8071533e8a298a060ff4a257eb5e818661b (diff)
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>
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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