Documentation/devicetree/bindings/leds/backlight/pwm-backlight.yaml

Source file repositories/reference/linux-study-clean/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.yaml

File Facts

System
Linux kernel
Corpus path
Documentation/devicetree/bindings/leds/backlight/pwm-backlight.yaml
Extension
.yaml
Size
2173 bytes
Lines
92
Domain
Support Tooling And Documentation
Bucket
Documentation
Inferred role
Support Tooling And Documentation: configuration, schema, or hardware description
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

# SPDX-License-Identifier: GPL-2.0-only
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/backlight/pwm-backlight.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: pwm-backlight

maintainers:
  - Lee Jones <lee@kernel.org>
  - Daniel Thompson <daniel.thompson@linaro.org>
  - Jingoo Han <jingoohan1@gmail.com>

allOf:
  - $ref: common.yaml#

properties:
  compatible:
    const: pwm-backlight

  pwms:
    maxItems: 1

  pwm-names: true

  power-supply:
    description: regulator for supply voltage

  enable-gpios:
    description:
      Contains a single GPIO specifier for the GPIO which enables and disables
      the backlight.
    maxItems: 1

  post-pwm-on-delay-ms:
    description:
      Delay in ms between setting an initial (non-zero) PWM and enabling the
      backlight using GPIO.

  pwm-off-delay-ms:
    description:
      Delay in ms between disabling the backlight using GPIO and setting PWM
      value to 0.

  num-interpolated-steps:
    description:
      Number of interpolated steps between each value of brightness-levels
      table. This way a high resolution pwm duty cycle can be used without
      having to list out every possible value in the brightness-level array.
    $ref: /schemas/types.yaml#/definitions/uint32

dependencies:
  default-brightness-level: [brightness-levels]
  num-interpolated-steps: [brightness-levels]

required:
  - compatible
  - pwms

unevaluatedProperties: false

examples:
  - |
    backlight {
        compatible = "pwm-backlight";
        pwms = <&pwm 0 5000000>;

        brightness-levels = <0 4 8 16 32 64 128 255>;
        default-brightness-level = <6>;

Annotation

Implementation Notes