Documentation/devicetree/bindings/input/rotary-encoder.yaml

Source file repositories/reference/linux-study-clean/Documentation/devicetree/bindings/input/rotary-encoder.yaml

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System
Linux kernel
Corpus path
Documentation/devicetree/bindings/input/rotary-encoder.yaml
Extension
.yaml
Size
2482 bytes
Lines
91
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/input/rotary-encoder.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Rotary encoder

maintainers:
  - Frank Li <Frank.Li@nxp.com>

description:
  See Documentation/input/devices/rotary-encoder.rst for more information.

properties:
  compatible:
    const: rotary-encoder

  gpios:
    minItems: 2

  linux,axis:
    default: 0
    description:
      the input subsystem axis to map to this rotary encoder.
      Defaults to 0 (ABS_X / REL_X)

  rotary-encoder,steps:
    $ref: /schemas/types.yaml#/definitions/uint32
    default: 24
    description:
      Number of steps in a full turnaround of the
      encoder. Only relevant for absolute axis. Defaults to 24 which is a
      typical value for such devices.

  rotary-encoder,relative-axis:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      register a relative axis rather than an
      absolute one. Relative axis will only generate +1/-1 events on the input
      device, hence no steps need to be passed.

  rotary-encoder,rollover:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      Automatic rollover when the rotary value becomes
      greater than the specified steps or smaller than 0. For absolute axis only.

  rotary-encoder,steps-per-period:
    $ref: /schemas/types.yaml#/definitions/uint32
    default: 1
    enum: [1, 2, 4]
    description: |
      Number of steps (stable states) per period.
      The values have the following meaning:
      1: Full-period mode (default)
      2: Half-period mode
      4: Quarter-period mode

  wakeup-source: true

  rotary-encoder,encoding:
    $ref: /schemas/types.yaml#/definitions/string
    description: the method used to encode steps.
    enum: [gray, binary]

  rotary-encoder,half-period:
    $ref: /schemas/types.yaml#/definitions/flag
    deprecated: true
    description:

Annotation

Implementation Notes