1# SPDX-License-Identifier: GPL-2.0 2%YAML 1.2 3--- 4$id: http://devicetree.org/schemas/mux/gpio-mux.yaml# 5$schema: http://devicetree.org/meta-schemas/core.yaml# 6 7title: GPIO-based multiplexer controller 8 9maintainers: 10 - Peter Rosin <peda@axentia.se> 11 12description: |+ 13 Define what GPIO pins are used to control a multiplexer. Or several 14 multiplexers, if the same pins control more than one multiplexer. 15 16 The multiplexer state is defined as the number represented by the 17 multiplexer GPIO pins, where the first pin is the least significant 18 bit. An active pin is a binary 1, an inactive pin is a binary 0. 19 20properties: 21 compatible: 22 const: gpio-mux 23 24 mux-gpios: 25 description: 26 List of gpios used to control the multiplexer, least significant bit first. 27 28 '#mux-control-cells': 29 enum: [ 0, 1 ] 30 31 '#mux-state-cells': 32 enum: [ 1, 2 ] 33 34 idle-state: 35 default: -1 36 37required: 38 - compatible 39 - mux-gpios 40anyOf: 41 - required: 42 - "#mux-control-cells" 43 - required: 44 - "#mux-state-cells" 45 46additionalProperties: false 47 48examples: 49 - | 50 #include <dt-bindings/gpio/gpio.h> 51 52 mux: mux-controller { 53 compatible = "gpio-mux"; 54 #mux-control-cells = <0>; 55 56 mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>, 57 <&pioA 1 GPIO_ACTIVE_HIGH>; 58 }; 59 60 adc-mux { 61 compatible = "io-channel-mux"; 62 io-channels = <&adc 0>; 63 io-channel-names = "parent"; 64 65 mux-controls = <&mux>; 66 67 channels = "sync-1", "in", "out", "sync-2"; 68 }; 69 70 i2c-mux { 71 compatible = "i2c-mux"; 72 i2c-parent = <&i2c1>; 73 74 mux-controls = <&mux>; 75 76 #address-cells = <1>; 77 #size-cells = <0>; 78 79 i2c@0 { 80 reg = <0>; 81 #address-cells = <1>; 82 #size-cells = <0>; 83 84 ssd1307: oled@3c { 85 reg = <0x3c>; 86 }; 87 }; 88 89 i2c@3 { 90 reg = <3>; 91 #address-cells = <1>; 92 #size-cells = <0>; 93 94 pca9555: pca9555@20 { 95 reg = <0x20>; 96 }; 97 }; 98 }; 99... 100