leds-lm3532.txt

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    1 * Texas Instruments - lm3532 White LED driver with ambient light sensing
    2 capability.
    3 
    4 The LM3532 provides the 3 high-voltage, low-side current sinks. The device is
    5 programmable over an I2C-compatible interface and has independent
    6 current control for all three channels. The adaptive current regulation
    7 method allows for different LED currents in each current sink thus allowing
    8 for a wide variety of backlight and keypad applications.
    9 
   10 The main features of the LM3532 include dual ambient light sensor inputs
   11 each with 32 internal voltage setting resistors, 8-bit logarithmic and linear
   12 brightness control, dual external PWM brightness control inputs, and up to
   13 1000:1 dimming ratio with programmable fade in and fade out settings.
   14 
   15 Required properties:
   16         - compatible : "ti,lm3532"
   17         - reg : I2C slave address
   18         - #address-cells : 1
   19         - #size-cells : 0
   20 
   21 Optional properties:
   22         - enable-gpios : gpio pin to enable (active high)/disable the device.
   23         - ramp-up-us - The Run time ramp rates/step are from one current
   24                        set-point to another after the device has reached its
   25                        initial target set point from turn-on
   26         - ramp-down-us - The Run time ramp rates/step are from one current
   27                          set-point to another after the device has reached its
   28                          initial target set point from turn-on
   29         Range for ramp settings: 8us - 65536us
   30 
   31 Optional properties if ALS mode is used:
   32         - ti,als-vmin - Minimum ALS voltage defined in Volts
   33         - ti,als-vmax - Maximum ALS voltage defined in Volts
   34         Per the data sheet the max ALS voltage is 2V and the min is 0V
   35 
   36         - ti,als1-imp-sel - ALS1 impedance resistor selection in Ohms
   37         - ti,als2-imp-sel - ALS2 impedance resistor selection in Ohms
   38         Range for impedance select: 37000 Ohms - 1190 Ohms
   39         Values above 37kohms will be set to the "High Impedance" setting
   40 
   41         - ti,als-avrg-time-us - Determines the length of time the device needs to
   42                           average the two ALS inputs.  This is only used if
   43                           the input mode is LM3532_ALS_INPUT_AVRG.
   44                              Range: 17920us - 2293760us
   45         - ti,als-input-mode - Determines how the device uses the attached ALS
   46                            devices.
   47                            0x00 - ALS1 and ALS2 input average
   48                            0x01 - ALS1 Input
   49                            0x02 - ALS2 Input
   50                            0x03 - Max of ALS1 and ALS2
   51 
   52 Required child properties:
   53         - reg : Indicates control bank the LED string is controlled by
   54         - led-sources : see Documentation/devicetree/bindings/leds/common.txt
   55         - ti,led-mode : Defines if the LED strings are manually controlled or
   56                         if the LED strings are controlled by the ALS.
   57                         0x00 - LED strings are I2C controlled via full scale
   58                                brightness control register
   59                         0x01 - LED strings are ALS controlled
   60 
   61 Optional LED child properties:
   62         - label : see Documentation/devicetree/bindings/leds/common.txt
   63         - linux,default-trigger :
   64            see Documentation/devicetree/bindings/leds/common.txt
   65         - led-max-microamp : Defines the full scale current value for each control
   66                           bank.  The range is from 5000uA-29800uA in increments
   67                           of 800uA.
   68 
   69 Example:
   70 led-controller@38 {
   71         compatible = "ti,lm3532";
   72         #address-cells = <1>;
   73         #size-cells = <0>;
   74         reg = <0x38>;
   75 
   76         enable-gpios = <&gpio6 12 GPIO_ACTIVE_HIGH>;
   77         ramp-up-us = <1024>;
   78         ramp-down-us = <65536>;
   79 
   80         ti,als-vmin = <0>;
   81         ti,als-vmax = <2000>;
   82         ti,als1-imp-sel = <4110>;
   83         ti,als2-imp-sel = <2180>;
   84         ti,als-avrg-time-us = <17920>;
   85         ti,als-input-mode = <0x00>;
   86 
   87         led@0 {
   88                 reg = <0>;
   89                 led-sources = <2>;
   90                 ti,led-mode = <1>;
   91                 led-max-microamp = <21800>;
   92                 label = ":backlight";
   93                 linux,default-trigger = "backlight";
   94         };
   95 
   96         led@1 {
   97                 reg = <1>;
   98                 led-sources = <1>;
   99                 ti,led-mode = <0>;
  100                 label = ":kbd_backlight";
  101         };
  102 };
  103 
  104 For more product information please see the links below:
  105 https://www.ti.com/product/LM3532

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