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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/input/gpio-matrix-keypad.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: GPIO matrix keypad
maintainers:
- Marek Vasut <marek.vasut@gmail.com>
description:
GPIO driven matrix keypad is used to interface a SoC with a matrix keypad.
The matrix keypad supports multiple row and column lines, a key can be
placed at each intersection of a unique row and a unique column. The matrix
keypad can sense a key-press and key-release by means of GPIO lines and
report the event using GPIO interrupts to the cpu.
allOf:
- $ref: /schemas/input/matrix-keymap.yaml#
properties:
compatible:
const: gpio-matrix-keypad
row-gpios:
description:
List of GPIOs used as row lines. The gpio specifier for this property
depends on the gpio controller to which these row lines are connected.
col-gpios:
description:
List of GPIOs used as column lines. The gpio specifier for this property
depends on the gpio controller to which these column lines are connected.
linux,keymap: true
linux,no-autorepeat:
type: boolean
description: Do not enable autorepeat feature.
gpio-activelow:
type: boolean
description:
Force GPIO polarity to active low.
In the absence of this property GPIOs are treated as active high.
debounce-delay-ms:
description: Debounce interval in milliseconds.
default: 0
col-scan-delay-us:
description:
Delay, measured in microseconds, that is needed
before we can scan keypad after activating column gpio.
default: 0
all-cols-on-delay-us:
description:
Delay, measured in microseconds, that is needed
after activating all column gpios.
default: 0
drive-inactive-cols:
type: boolean
description:
Drive inactive columns during scan,
default is to turn inactive columns into inputs.
wakeup-source: true
required:
- compatible
- row-gpios
- col-gpios
- linux,keymap
additionalProperties: false
examples:
- |
matrix-keypad {
compatible = "gpio-matrix-keypad";
debounce-delay-ms = <5>;
col-scan-delay-us = <2>;
row-gpios = <&gpio2 25 0
&gpio2 26 0
&gpio2 27 0>;
col-gpios = <&gpio2 21 0
&gpio2 22 0>;
linux,keymap = <0x0000008B
0x0100009E
0x02000069
0x0001006A
0x0101001C
0x0201006C>;
wakeup-source;
};
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