Documentation/devicetree/bindings/leds/leds-lm36274.txt

   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