leds-lm36274.txt

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    1 * Texas Instruments LM36274 4-Channel LCD Backlight Driver w/Integrated Bias
    2 
    3 The LM36274 is an integrated four-channel WLED driver and LCD bias supply.
    4 The backlight boost provides the power to bias four parallel LED strings with
    5 up to 29V total output voltage. The 11-bit LED current is programmable via
    6 the I2C bus and/or controlled via a logic level PWM input from 60 uA to 30 mA.
    7 
    8 Parent device properties are documented in
    9 Documentation/devicetree/bindings/mfd/ti-lmu.txt
   10 
   11 Regulator properties are documented in
   12 Documentation/devicetree/bindings/regulator/lm363x-regulator.txt
   13 
   14 Required backlight properties:
   15         - compatible:
   16                 "ti,lm36274-backlight"
   17         - reg : 0
   18         - #address-cells : 1
   19         - #size-cells : 0
   20         - led-sources : Indicates which LED strings will be enabled.
   21                         Values from 0-3, sources is 0 based so strings will be
   22                         source value + 1.
   23 
   24 Optional backlight properties:
   25         - label : see Documentation/devicetree/bindings/leds/common.txt
   26         - linux,default-trigger :
   27            see Documentation/devicetree/bindings/leds/common.txt
   28 
   29 Example:
   30 
   31 HVLED string 1 and 3 are controlled by control bank A and HVLED 2 string is
   32 controlled by control bank B.
   33 
   34 lm36274@11 {
   35         compatible = "ti,lm36274";
   36         #address-cells = <1>;
   37         #size-cells = <0>;
   38         reg = <0x11>;
   39 
   40         enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
   41 
   42         regulators {
   43                 #address-cells = <1>;
   44                 #size-cells = <0>;
   45                 compatible = "ti,lm363x-regulator";
   46 
   47                 enable-gpios = <&pioC 0 GPIO_ACTIVE_HIGH>,
   48                                <&pioC 1 GPIO_ACTIVE_HIGH>;
   49 
   50                 vboost {
   51                         regulator-name = "lcd_boost";
   52                         regulator-min-microvolt = <4000000>;
   53                         regulator-max-microvolt = <7150000>;
   54                         regulator-always-on;
   55                 };
   56 
   57                 vpos {
   58                         regulator-name = "lcd_vpos";
   59                         regulator-min-microvolt = <4000000>;
   60                         regulator-max-microvolt = <6500000>;
   61                 };
   62 
   63                 vneg {
   64                         regulator-name = "lcd_vneg";
   65                         regulator-min-microvolt = <4000000>;
   66                         regulator-max-microvolt = <6500000>;
   67                 };
   68         };
   69 
   70         backlight {
   71                 #address-cells = <1>;
   72                 #size-cells = <0>;
   73                 compatible = "ti,lm36274-backlight";
   74 
   75                 led@0 {
   76                         reg = <0>;
   77                         led-sources = <0 2>;
   78                         label = "white:backlight_cluster";
   79                         linux,default-trigger = "backlight";
   80                 };
   81         };
   82 };
   83 
   84 For more product information please see the link below:
   85 https://www.ti.com/lit/ds/symlink/lm36274.pdf

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