Documentation/devicetree/bindings/leds/leds-lm3697.txt

   1 * Texas Instruments - LM3697 Highly Efficient White LED Driver
   2
   3 The LM3697 11-bit LED driver provides high-
   4 performance backlight dimming for 1, 2, or 3 series
   5 LED strings while delivering up to 90% efficiency.
   6
   7 This device is suitable for display and keypad lighting
   8
   9 Required properties:
  10         - compatible:
  11                 "ti,lm3697"
  12         - reg :  I2C slave address
  13         - #address-cells : 1
  14         - #size-cells : 0
  15
  16 Optional properties:
  17         - enable-gpios : GPIO pin to enable/disable the device
  18         - vled-supply : LED supply
  19
  20 Required child properties:
  21         - reg : 0 - LED is Controlled by bank A
  22                 1 - LED is Controlled by bank B
  23         - led-sources : Indicates which HVLED string is associated to which
  24                         control bank.  This is a zero based property so
  25                         HVLED1 = 0, HVLED2 = 1, HVLED3 = 2.
  26                         Additional information is contained
  27                         in Documentation/devicetree/bindings/leds/common.txt
  28
  29 Optional child properties:
  30         - ti,brightness-resolution - see Documentation/devicetree/bindings/mfd/ti-lmu.txt
  31         - ramp-up-us: see Documentation/devicetree/bindings/mfd/ti-lmu.txt
  32         - ramp-down-us: see Documentation/devicetree/bindings/mfd/ti-lmu.txt
  33         - label : see Documentation/devicetree/bindings/leds/common.txt
  34         - linux,default-trigger :
  35            see Documentation/devicetree/bindings/leds/common.txt
  36
  37 Example:
  38
  39 HVLED string 1 and 3 are controlled by control bank A and HVLED 2 string is
  40 controlled by control bank B.
  41
  42 led-controller@36 {
  43         compatible = "ti,lm3697";
  44         #address-cells = <1>;
  45         #size-cells = <0>;
  46         reg = <0x36>;
  47
  48         enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
  49         vled-supply = <&vbatt>;
  50
  51         led@0 {
  52                 reg = <0>;
  53                 led-sources = <0 2>;
  54                 ti,brightness-resolution = <2047>;
  55                 ramp-up-us = <5000>;
  56                 ramp-down-us = <1000>;
  57                 label = "white:first_backlight_cluster";
  58                 linux,default-trigger = "backlight";
  59         };
  60
  61         led@1 {
  62                 reg = <1>;
  63                 led-sources = <1>;
  64                 ti,brightness-resolution = <255>;
  65                 ramp-up-us = <500>;
  66                 ramp-down-us = <1000>;
  67                 label = "white:second_backlight_cluster";
  68                 linux,default-trigger = "backlight";
  69         };
  70 }
  71
  72 For more product information please see the link below:
  73 https://www.ti.com/lit/ds/symlink/lm3697.pdf