1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/input/matrix-keymap.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Common Key Matrices on Matrix-connected Key Boards
8
9maintainers:
10  - Olof Johansson <olof@lixom.net>
11
12description: |
13  A simple common binding for matrix-connected key boards. Currently targeted at
14  defining the keys in the scope of linux key codes since that is a stable and
15  standardized interface at this time.
16
17  Some users of this binding might choose to specify secondary keymaps for
18  cases where there is a modifier key such as a Fn key. Proposed names
19  for said properties are "linux,fn-keymap" or with another descriptive
20  word for the modifier other from "Fn".
21
22properties:
23  linux,keymap:
24    $ref: /schemas/types.yaml#/definitions/uint32-array
25    description: |
26      An array of packed 1-cell entries containing the equivalent of row,
27      column and linux key-code. The 32-bit big endian cell is packed as:
28          row << 24 | column << 16 | key-code
29
30  keypad,num-rows:
31    $ref: /schemas/types.yaml#/definitions/uint32
32    description: Number of row lines connected to the keypad controller.
33
34  keypad,num-columns:
35    $ref: /schemas/types.yaml#/definitions/uint32
36    description: Number of column lines connected to the keypad controller.
37
38additionalProperties: true
39
40examples:
41  - |
42    keypad {
43        /* ... */
44        linux,keymap = < 0x00030012
45                         0x0102003a >;
46        keypad,num-rows = <2>;
47        keypad,num-columns = <8>;
48    };
49