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- Device-tree bindings for I2C OPAL driver
- ----------------------------------------
- Most of the device node and properties layout is specific to the firmware and
- used by the firmware itself for configuring the port. From the linux
- perspective, the properties of use are "ibm,port-name" and "ibm,opal-id".
- Required properties:
- - reg: Port-id within a given master
- - compatible: must be "ibm,opal-i2c"
- - ibm,opal-id: Refers to a specific bus and used to identify it when calling
- the relevant OPAL functions.
- - bus-frequency: Operating frequency of the i2c bus (in HZ). Informational for
- linux, used by the FW though.
- Optional properties:
- - ibm,port-name: Firmware provides this name that uniquely identifies the i2c
- port.
- The node contains a number of other properties that are used by the FW itself
- and depend on the specific hardware implementation. The example below depicts
- a P8 on-chip bus.
- Example:
- i2c-bus@0 {
- reg = <0x0>;
- bus-frequency = <0x61a80>;
- compatible = "ibm,power8-i2c-port", "ibm,opal-i2c";
- ibm,opal-id = <0x1>;
- ibm,port-name = "p8_00000000_e1p0";
- #address-cells = <0x1>;
- phandle = <0x10000006>;
- #size-cells = <0x0>;
- linux,phandle = <0x10000006>;
- };
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