path: root/dts/Bindings/input/matrix-keymap.yaml
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2

title: Common key matrices binding for matrix-connected key boards

  - Olof Johansson <>

description: |
  A simple common binding for matrix-connected key boards. Currently targeted at
  defining the keys in the scope of linux key codes since that is a stable and
  standardized interface at this time.

  Some users of this binding might choose to specify secondary keymaps for
  cases where there is a modifier key such as a Fn key. Proposed names
  for said properties are "linux,fn-keymap" or with another descriptive
  word for the modifier other from "Fn".

    $ref: '/schemas/types.yaml#/definitions/uint32-array'
    description: |
      An array of packed 1-cell entries containing the equivalent of row,
      column and linux key-code. The 32-bit big endian cell is packed as:
          row << 24 | column << 16 | key-code

    $ref: /schemas/types.yaml#/definitions/uint32
    description: Number of row lines connected to the keypad controller.

    $ref: /schemas/types.yaml#/definitions/uint32
    description: Number of column lines connected to the keypad controller.

additionalProperties: true

  - |
    keypad {
        /* ... */
        linux,keymap = < 0x00030012
                         0x0102003a >;
        keypad,num-rows = <2>;
        keypad,num-columns = <8>;