pwm-backlight.yaml

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    1 # SPDX-License-Identifier: GPL-2.0-only
    2 %YAML 1.2
    3 ---
    4 $id: http://devicetree.org/schemas/leds/backlight/pwm-backlight.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: pwm-backlight bindings
    8 
    9 maintainers:
   10   - Lee Jones <lee@kernel.org>
   11   - Daniel Thompson <daniel.thompson@linaro.org>
   12   - Jingoo Han <jingoohan1@gmail.com>
   13 
   14 properties:
   15   compatible:
   16     const: pwm-backlight
   17 
   18   pwms:
   19     maxItems: 1
   20 
   21   pwm-names: true
   22 
   23   power-supply:
   24     description: regulator for supply voltage
   25 
   26   enable-gpios:
   27     description:
   28       Contains a single GPIO specifier for the GPIO which enables and disables
   29       the backlight.
   30     maxItems: 1
   31 
   32   post-pwm-on-delay-ms:
   33     description:
   34       Delay in ms between setting an initial (non-zero) PWM and enabling the
   35       backlight using GPIO.
   36 
   37   pwm-off-delay-ms:
   38     description:
   39       Delay in ms between disabling the backlight using GPIO and setting PWM
   40       value to 0.
   41 
   42   brightness-levels:
   43     description:
   44       Array of distinct brightness levels. Typically these are in the range
   45       from 0 to 255, but any range starting at 0 will do. The actual brightness
   46       level (PWM duty cycle) will be interpolated from these values. 0 means a
   47       0% duty cycle (darkest/off), while the last value in the array represents
   48       a 100% duty cycle (brightest).
   49     $ref: /schemas/types.yaml#/definitions/uint32-array
   50 
   51   default-brightness-level:
   52     description:
   53       The default brightness level (index into the array defined by the
   54       "brightness-levels" property).
   55     $ref: /schemas/types.yaml#/definitions/uint32
   56 
   57   num-interpolated-steps:
   58     description:
   59       Number of interpolated steps between each value of brightness-levels
   60       table. This way a high resolution pwm duty cycle can be used without
   61       having to list out every possible value in the brightness-level array.
   62     $ref: /schemas/types.yaml#/definitions/uint32
   63 
   64 dependencies:
   65   default-brightness-level: [brightness-levels]
   66   num-interpolated-steps: [brightness-levels]
   67 
   68 required:
   69   - compatible
   70   - pwms
   71   - power-supply
   72 
   73 additionalProperties: false
   74 
   75 examples:
   76   - |
   77     backlight {
   78         compatible = "pwm-backlight";
   79         pwms = <&pwm 0 5000000>;
   80 
   81         brightness-levels = <0 4 8 16 32 64 128 255>;
   82         default-brightness-level = <6>;
   83 
   84         power-supply = <&vdd_bl_reg>;
   85         enable-gpios = <&gpio 58 0>;
   86         post-pwm-on-delay-ms = <10>;
   87         pwm-off-delay-ms = <10>;
   88     };
   89 
   90   - |
   91     // Example using num-interpolation-steps:
   92     backlight {
   93         compatible = "pwm-backlight";
   94         pwms = <&pwm 0 5000000>;
   95 
   96         brightness-levels = <0 2048 4096 8192 16384 65535>;
   97         num-interpolated-steps = <2048>;
   98         default-brightness-level = <4096>;
   99 
  100         power-supply = <&vdd_bl_reg>;
  101         enable-gpios = <&gpio 58 0>;
  102     };
  103 
  104 ...

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/leds/backlight/pwm-backlight.yaml

FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/leds/backlight/pwm-backlight.yaml