2019-06-05 20:56:33 +08:00
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* Texas Instruments LM36274 4-Channel LCD Backlight Driver w/Integrated Bias
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The LM36274 is an integrated four-channel WLED driver and LCD bias supply.
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The backlight boost provides the power to bias four parallel LED strings with
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up to 29V total output voltage. The 11-bit LED current is programmable via
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the I2C bus and/or controlled via a logic level PWM input from 60 uA to 30 mA.
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Parent device properties are documented in
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2019-06-28 20:12:26 +08:00
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Documentation/devicetree/bindings/mfd/ti-lmu.txt
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2019-06-05 20:56:33 +08:00
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Regulator properties are documented in
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Documentation/devicetree/bindings/regulator/lm363x-regulator.txt
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Required backlight properties:
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- compatible:
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"ti,lm36274-backlight"
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- reg : 0
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- #address-cells : 1
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- #size-cells : 0
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- led-sources : Indicates which LED strings will be enabled.
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Values from 0-3, sources is 0 based so strings will be
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source value + 1.
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Optional backlight properties:
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- label : see Documentation/devicetree/bindings/leds/common.txt
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- linux,default-trigger :
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see Documentation/devicetree/bindings/leds/common.txt
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Example:
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HVLED string 1 and 3 are controlled by control bank A and HVLED 2 string is
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controlled by control bank B.
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lm36274@11 {
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compatible = "ti,lm36274";
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#address-cells = <1>;
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#size-cells = <0>;
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reg = <0x11>;
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enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
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regulators {
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#address-cells = <1>;
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#size-cells = <0>;
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compatible = "ti,lm363x-regulator";
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enable-gpios = <&pioC 0 GPIO_ACTIVE_HIGH>,
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<&pioC 1 GPIO_ACTIVE_HIGH>;
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vboost {
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regulator-name = "lcd_boost";
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regulator-min-microvolt = <4000000>;
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regulator-max-microvolt = <7150000>;
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regulator-always-on;
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};
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vpos {
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regulator-name = "lcd_vpos";
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regulator-min-microvolt = <4000000>;
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regulator-max-microvolt = <6500000>;
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};
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vneg {
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regulator-name = "lcd_vneg";
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regulator-min-microvolt = <4000000>;
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regulator-max-microvolt = <6500000>;
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};
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};
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backlight {
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#address-cells = <1>;
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#size-cells = <0>;
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compatible = "ti,lm36274-backlight";
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led@0 {
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reg = <0>;
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led-sources = <0 2>;
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label = "white:backlight_cluster";
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linux,default-trigger = "backlight";
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};
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};
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};
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For more product information please see the link below:
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2020-07-13 22:51:15 +08:00
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https://www.ti.com/lit/ds/symlink/lm36274.pdf
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