cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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pwm-backlight.yaml (2825B)

      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
      7title: pwm-backlight bindings
      8
      9maintainers:
     10  - Lee Jones <lee.jones@linaro.org>
     11  - Daniel Thompson <daniel.thompson@linaro.org>
     12  - Jingoo Han <jingoohan1@gmail.com>
     13
     14properties:
     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
     64dependencies:
     65  default-brightness-level: [brightness-levels]
     66  num-interpolated-steps: [brightness-levels]
     67
     68required:
     69  - compatible
     70  - pwms
     71  - power-supply
     72
     73additionalProperties: false
     74
     75examples:
     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...