The method is called to determine which FireWire isochronous channels and speed this port supports.
- macOS 10.1+
The isoch port interface to use.
A pointer to an IOFWSpeed which should be filled with the maximum speed this port can talk or listen.
A pointer to a UInt64 which should be filled with a bitmask representing the FireWire bus isochonous channels on which the port can talk or listen. Set '1' for supported, '' for unsupported.
Return kIOReturnSuccess on success, other return any other IOReturn error code.
This method is called by the channel object to which a port has been added. Subclasses of IOFireWireIsochPortInterface override this method to support specific hardware. Do not call this method directly.