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# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/mux/gpio-mux.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: GPIO-based multiplexer controller
maintainers:
- Peter Rosin <peda@axentia.se>
description: |+
Define what GPIO pins are used to control a multiplexer. Or several
multiplexers, if the same pins control more than one multiplexer.
The multiplexer state is defined as the number represented by the
multiplexer GPIO pins, where the first pin is the least significant
bit. An active pin is a binary 1, an inactive pin is a binary 0.
properties:
compatible:
const: gpio-mux
mux-gpios:
description:
List of gpios used to control the multiplexer, least significant bit first.
'#mux-control-cells':
enum: [ 0, 1 ]
'#mux-state-cells':
enum: [ 1, 2 ]
idle-state:
default: -1
required:
- compatible
- mux-gpios
anyOf:
- required:
- "#mux-control-cells"
- required:
- "#mux-state-cells"
additionalProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
mux: mux-controller {
compatible = "gpio-mux";
#mux-control-cells = <0>;
mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>,
<&pioA 1 GPIO_ACTIVE_HIGH>;
};
adc-mux {
compatible = "io-channel-mux";
io-channels = <&adc 0>;
io-channel-names = "parent";
mux-controls = <&mux>;
channels = "sync-1", "in", "out", "sync-2";
};
i2c-mux {
compatible = "i2c-mux";
i2c-parent = <&i2c1>;
mux-controls = <&mux>;
#address-cells = <1>;
#size-cells = <0>;
i2c@0 {
reg = <0>;
#address-cells = <1>;
#size-cells = <0>;
ssd1307: oled@3c {
reg = <0x3c>;
};
};
i2c@3 {
reg = <3>;
#address-cells = <1>;
#size-cells = <0>;
pca9555: pca9555@20 {
reg = <0x20>;
};
};
};
...
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