The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/i2c/i2c-opal.txt

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    1 Device-tree bindings for I2C OPAL driver
    2 ----------------------------------------
    3 
    4 Most of the device node and properties layout is specific to the firmware and
    5 used by the firmware itself for configuring the port. From the linux
    6 perspective, the properties of use are "ibm,port-name" and "ibm,opal-id".
    7 
    8 Required properties:
    9 
   10 - reg: Port-id within a given master
   11 - compatible: must be "ibm,opal-i2c"
   12 - ibm,opal-id: Refers to a specific bus and used to identify it when calling
   13                the relevant OPAL functions.
   14 - bus-frequency: Operating frequency of the i2c bus (in HZ). Informational for
   15                  linux, used by the FW though.
   16 
   17 Optional properties:
   18 - ibm,port-name: Firmware provides this name that uniquely identifies the i2c
   19                  port.
   20 
   21 The node contains a number of other properties that are used by the FW itself
   22 and depend on the specific hardware implementation. The example below depicts
   23 a P8 on-chip bus.
   24 
   25 Example:
   26 
   27 i2c-bus@0 {
   28         reg = <0x0>;
   29         bus-frequency = <0x61a80>;
   30         compatible = "ibm,power8-i2c-port", "ibm,opal-i2c";
   31         ibm,opal-id = <0x1>;
   32         ibm,port-name = "p8_00000000_e1p0";
   33         #address-cells = <0x1>;
   34         phandle = <0x10000006>;
   35         #size-cells = <0x0>;
   36         linux,phandle = <0x10000006>;
   37 };

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