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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 bindings
+
+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>;
+ };
+ };
+ };
+...