FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/input/matrix-keymap.yaml

     # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
     %YAML 1.2
     ---
     $id: http://devicetree.org/schemas/input/matrix-keymap.yaml#
     $schema: http://devicetree.org/meta-schemas/core.yaml#
     
     title: Common key matrices binding for matrix-connected key boards
     
     maintainers:
      - Olof Johansson <olof@lixom.net>
    
    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".
    
    properties:
      linux,keymap:
        $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
    
      keypad,num-rows:
        $ref: /schemas/types.yaml#/definitions/uint32
        description: Number of row lines connected to the keypad controller.
    
      keypad,num-columns:
        $ref: /schemas/types.yaml#/definitions/uint32
        description: Number of column lines connected to the keypad controller.
    
    additionalProperties: true
    
    examples:
      - |
        keypad {
            /* ... */
            linux,keymap = < 0x00030012
                             0x0102003a >;
            keypad,num-rows = <2>;
            keypad,num-columns = <8>;
        };

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