leds-lm3697.txt

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    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

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sys/contrib/device-tree/Bindings/leds/leds-lm3697.txt