* 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:
https://www.ti.com/lit/ds/symlink/lm36274.pdf
