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

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

File Facts

System
Linux kernel
Corpus path
Documentation/devicetree/bindings/leds/leds-pwm.yaml
Extension
.yaml
Size
1858 bytes
Lines
79
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.

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Annotated Snippet

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/leds-pwm.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: LEDs connected to PWM

maintainers:
  - Pavel Machek <pavel@ucw.cz>

description:
  Each LED is represented as a sub-node of the pwm-leds device.  Each
  node's name represents the name of the corresponding LED.

properties:
  compatible:
    const: pwm-leds

patternProperties:
  "^led(-[0-9a-f]+)?$":
    type: object
    $ref: common.yaml#
    unevaluatedProperties: false

    properties:
      pwms:
        maxItems: 1

      pwm-names: true

      max-brightness:
        description:
          Maximum brightness possible for the LED
        $ref: /schemas/types.yaml#/definitions/uint32

      default-brightness:
        description:
          Brightness to be set if LED's default state is on. Used only during
          initialization. If the option is not set then max brightness is used.
        $ref: /schemas/types.yaml#/definitions/uint32

      enable-gpios:
        description:
          GPIO for LED hardware enable control. Set active when brightness is
          non-zero and inactive when brightness is zero.
          The GPIO default state follows the "default-state" property.
        maxItems: 1

    required:
      - pwms
      - max-brightness

additionalProperties: false

examples:
  - |

    #include <dt-bindings/leds/common.h>

    led-controller {
        compatible = "pwm-leds";

        led-1 {
            label = "omap4::keypad";
            pwms = <&twl_pwm 0 7812500>;
            max-brightness = <127>;
        };

        led-2 {

Annotation

Implementation Notes