# 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 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 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>; }; }; }; ...