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Member "linux-5.3.1/Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml" (21 Sep 2019, 3350 Bytes) of package /linux/kernel/v5.3/linux-5.3.1.tar.xz:


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    1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
    2 %YAML 1.2
    3 ---
    4 $id: http://devicetree.org/schemas/leds/backlight/lm3630a-backlight.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: TI LM3630A High-Efficiency Dual-String White LED
    8 
    9 maintainers:
   10   - Lee Jones <lee.jones@linaro.org>
   11   - Daniel Thompson <daniel.thompson@linaro.org>
   12   - Jingoo Han <jingoohan1@gmail.com>
   13 
   14 description: |
   15   The LM3630A is a current-mode boost converter which supplies the power and
   16   controls the current in up to two strings of 10 LEDs per string.
   17   https://www.ti.com/product/LM3630A
   18 
   19 properties:
   20   compatible:
   21     const: ti,lm3630a
   22 
   23   reg:
   24     maxItems: 1
   25 
   26   '#address-cells':
   27     const: 1
   28 
   29   '#size-cells':
   30     const: 0
   31 
   32 required:
   33   - compatible
   34   - reg
   35   - '#address-cells'
   36   - '#size-cells'
   37 
   38 patternProperties:
   39   "^led@[01]$":
   40     type: object
   41     description: |
   42       Properties for a string of connected LEDs.
   43 
   44     properties:
   45       reg:
   46         description: |
   47           The control bank that is used to program the two current sinks. The
   48           LM3630A has two control banks (A and B) and are represented as 0 or 1
   49           in this property. The two current sinks can be controlled
   50           independently with both banks, or bank A can be configured to control
   51           both sinks with the led-sources property.
   52         minimum: 0
   53         maximum: 1
   54 
   55       label:
   56         maxItems: 1
   57 
   58       led-sources:
   59         allOf:
   60           - minItems: 1
   61             maxItems: 2
   62             items:
   63               minimum: 0
   64               maximum: 1
   65 
   66       default-brightness:
   67         description: Default brightness level on boot.
   68         minimum: 0
   69         maximum: 255
   70 
   71       max-brightness:
   72         description: Maximum brightness that is allowed during runtime.
   73         minimum: 0
   74         maximum: 255
   75 
   76       ti,linear-mapping-mode:
   77         description: |
   78           Enable linear mapping mode. If disabled, then it will use exponential
   79           mapping mode in which the ramp up/down appears to have a more uniform
   80           transition to the human eye.
   81         type: boolean
   82 
   83     required:
   84       - reg
   85 
   86     additionalProperties: false
   87 
   88 additionalProperties: false
   89 
   90 examples:
   91   - |
   92     i2c {
   93         #address-cells = <1>;
   94         #size-cells = <0>;
   95 
   96         led-controller@38 {
   97                 compatible = "ti,lm3630a";
   98                 reg = <0x38>;
   99 
  100                 #address-cells = <1>;
  101                 #size-cells = <0>;
  102 
  103                 led@0 {
  104                         reg = <0>;
  105                         led-sources = <0 1>;
  106                         label = "lcd-backlight";
  107                         default-brightness = <200>;
  108                         max-brightness = <255>;
  109                 };
  110         };
  111     };
  112   - |
  113     i2c {
  114         #address-cells = <1>;
  115         #size-cells = <0>;
  116 
  117         led-controller@38 {
  118                 compatible = "ti,lm3630a";
  119                 reg = <0x38>;
  120 
  121                 #address-cells = <1>;
  122                 #size-cells = <0>;
  123 
  124                 led@0 {
  125                         reg = <0>;
  126                         default-brightness = <150>;
  127                         ti,linear-mapping-mode;
  128                 };
  129 
  130                 led@1 {
  131                         reg = <1>;
  132                         default-brightness = <225>;
  133                         ti,linear-mapping-mode;
  134                 };
  135         };
  136     };