i2c-mux.yaml

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    1 # SPDX-License-Identifier: GPL-2.0
    2 %YAML 1.2
    3 ---
    4 $id: http://devicetree.org/schemas/i2c/i2c-mux.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: Common i2c bus multiplexer/switch properties.
    8 
    9 maintainers:
   10   - Peter Rosin <peda@axentia.se>
   11 
   12 description: |+
   13   An i2c bus multiplexer/switch will have several child busses that are numbered
   14   uniquely in a device dependent manner.  The nodes for an i2c bus
   15   multiplexer/switch will have one child node for each child bus.
   16 
   17   For i2c multiplexers/switches that have child nodes that are a mixture of both
   18   i2c child busses and other child nodes, the 'i2c-mux' subnode can be used for
   19   populating the i2c child busses.  If an 'i2c-mux' subnode is present, only
   20   subnodes of this will be considered as i2c child busses.
   21 
   22 properties:
   23   $nodename:
   24     pattern: '^(i2c-?)?mux'
   25 
   26   '#address-cells':
   27     const: 1
   28 
   29   '#size-cells':
   30     const: 0
   31 
   32 patternProperties:
   33   '^i2c@[0-9a-f]+$':
   34     $ref: /schemas/i2c/i2c-controller.yaml
   35     unevaluatedProperties: false
   36 
   37     properties:
   38       reg:
   39         description: The mux selector sub-bus number for the child I2C bus.
   40         maxItems: 1
   41 
   42 additionalProperties: true
   43 
   44 examples:
   45   - |
   46     /*
   47      * An NXP pca9548 8 channel I2C multiplexer at address 0x70
   48      * with two NXP pca8574 GPIO expanders attached, one each to
   49      * ports 3 and 4.
   50      */
   51     i2c {
   52         #address-cells = <1>;
   53         #size-cells = <0>;
   54 
   55         i2c-mux@70 {
   56             compatible = "nxp,pca9548";
   57             reg = <0x70>;
   58             #address-cells = <1>;
   59             #size-cells = <0>;
   60 
   61             i2c@3 {
   62                 #address-cells = <1>;
   63                 #size-cells = <0>;
   64                 reg = <3>;
   65 
   66                 gpio@20 {
   67                     compatible = "nxp,pca9555";
   68                     gpio-controller;
   69                     #gpio-cells = <2>;
   70                     reg = <0x20>;
   71                 };
   72             };
   73             i2c@4 {
   74                 #address-cells = <1>;
   75                 #size-cells = <0>;
   76                 reg = <4>;
   77 
   78                 gpio@20 {
   79                     compatible = "nxp,pca9555";
   80                     gpio-controller;
   81                     #gpio-cells = <2>;
   82                     reg = <0x20>;
   83                 };
   84             };
   85         };
   86     };
   87 ...

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/i2c/i2c-mux.yaml

FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/i2c/i2c-mux.yaml