mctp-i2c-controller.yaml

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    1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
    2 %YAML 1.2
    3 ---
    4 $id: http://devicetree.org/schemas/net/mctp-i2c-controller.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: MCTP I2C transport binding
    8 
    9 maintainers:
   10   - Matt Johnston <matt@codeconstruct.com.au>
   11 
   12 description: |
   13   An mctp-i2c-controller defines a local MCTP endpoint on an I2C controller.
   14   MCTP I2C is specified by DMTF DSP0237.
   15 
   16   An mctp-i2c-controller must be attached to an I2C adapter which supports
   17   slave functionality. I2C busses (either directly or as subordinate mux
   18   busses) are attached to the mctp-i2c-controller with a 'mctp-controller'
   19   property on each used bus. Each mctp-controller I2C bus will be presented
   20   to the host system as a separate MCTP I2C instance.
   21 
   22 properties:
   23   compatible:
   24     const: mctp-i2c-controller
   25 
   26   reg:
   27     minimum: 0x40000000
   28     maximum: 0x4000007f
   29     description: |
   30       7 bit I2C address of the local endpoint.
   31       I2C_OWN_SLAVE_ADDRESS (1<<30) flag must be set.
   32 
   33 additionalProperties: false
   34 
   35 required:
   36   - compatible
   37   - reg
   38 
   39 examples:
   40   - |
   41     // Basic case of a single I2C bus
   42     #include <dt-bindings/i2c/i2c.h>
   43 
   44     i2c {
   45       #address-cells = <1>;
   46       #size-cells = <0>;
   47       mctp-controller;
   48 
   49       mctp@30 {
   50         compatible = "mctp-i2c-controller";
   51         reg = <(0x30 | I2C_OWN_SLAVE_ADDRESS)>;
   52       };
   53     };
   54 
   55   - |
   56     // Mux topology with multiple MCTP-handling busses under
   57     // a single mctp-i2c-controller.
   58     // i2c1 and i2c6 can have MCTP devices, i2c5 does not.
   59     #include <dt-bindings/i2c/i2c.h>
   60 
   61     i2c1: i2c {
   62       #address-cells = <1>;
   63       #size-cells = <0>;
   64       mctp-controller;
   65 
   66       mctp@50 {
   67         compatible = "mctp-i2c-controller";
   68         reg = <(0x50 | I2C_OWN_SLAVE_ADDRESS)>;
   69       };
   70     };
   71 
   72     i2c-mux {
   73       #address-cells = <1>;
   74       #size-cells = <0>;
   75       i2c-parent = <&i2c1>;
   76 
   77       i2c5: i2c@0 {
   78         #address-cells = <1>;
   79         #size-cells = <0>;
   80         reg = <0>;
   81         eeprom@33 {
   82           reg = <0x33>;
   83         };
   84       };
   85 
   86       i2c6: i2c@1 {
   87         #address-cells = <1>;
   88         #size-cells = <0>;
   89         reg = <1>;
   90         mctp-controller;
   91       };
   92     };

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