1GPIO-based multiplexer controller bindings 2 3Define what GPIO pins are used to control a multiplexer. Or several 4multiplexers, if the same pins control more than one multiplexer. 5 6Required properties: 7- compatible : "gpio-mux" 8- mux-gpios : list of gpios used to control the multiplexer, least 9 significant bit first. 10- #mux-control-cells : <0> 11* Standard mux-controller bindings as decribed in mux-controller.txt 12 13Optional properties: 14- idle-state : if present, the state the mux will have when idle. The 15 special state MUX_IDLE_AS_IS is the default. 16 17The multiplexer state is defined as the number represented by the 18multiplexer GPIO pins, where the first pin is the least significant 19bit. An active pin is a binary 1, an inactive pin is a binary 0. 20 21Example: 22 23 mux: mux-controller { 24 compatible = "gpio-mux"; 25 #mux-control-cells = <0>; 26 27 mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>, 28 <&pioA 1 GPIO_ACTIVE_HIGH>; 29 }; 30 31 adc-mux { 32 compatible = "io-channel-mux"; 33 io-channels = <&adc 0>; 34 io-channel-names = "parent"; 35 36 mux-controls = <&mux>; 37 38 channels = "sync-1", "in", "out", "sync-2"; 39 }; 40 41 i2c-mux { 42 compatible = "i2c-mux"; 43 i2c-parent = <&i2c1>; 44 45 mux-controls = <&mux>; 46 47 #address-cells = <1>; 48 #size-cells = <0>; 49 50 i2c@0 { 51 reg = <0>; 52 #address-cells = <1>; 53 #size-cells = <0>; 54 55 ssd1307: oled@3c { 56 /* ... */ 57 }; 58 }; 59 60 i2c@3 { 61 reg = <3>; 62 #address-cells = <1>; 63 #size-cells = <0>; 64 65 pca9555: pca9555@20 { 66 /* ... */ 67 }; 68 }; 69 }; 70