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