gpio-mux.txt

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    1 GPIO-based multiplexer controller bindings
    2 
    3 Define what GPIO pins are used to control a multiplexer. Or several
    4 multiplexers, if the same pins control more than one multiplexer.
    5 
    6 Required 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 
   13 Optional 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 
   17 The multiplexer state is defined as the number represented by the
   18 multiplexer GPIO pins, where the first pin is the least significant
   19 bit. An active pin is a binary 1, an inactive pin is a binary 0.
   20 
   21 Example:
   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         };

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/mux/gpio-mux.txt

FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/mux/gpio-mux.txt