Transceivers for CAN are not apart of any model. Traditional CAN didn't
have a problem because all transceivers from my understanding supported
the maximum speed of 1 Mbps defined by the spec. However, with the
introduction of CAN Flexible Datarate mode it seems that for
transceivers that supported CAN-FD the maximum supported speeds vary.

So transceivers are dumb devices, nothing to configure, so no need to
have a driver for them.

Now that I think of it
you also can't determine if the transceiver supports CAN-FD in the first
place. IP that supports CAN-FD is backwards compatible with standard
CAN. Therefore, its feasible that you may even use a transceiver that
doesn't support CAN-FD. So I would think something like the below would
be needed.

mcan@0 {
	...
	fixed-transceiver {
	      max-canfd-speed = <2000>
	};
	...
};

Are there likely to be other transceiver properties? Adding a subnode
may not make sense if this is going to be the only property.

Also, 2KHz is not very fast :-)

Taking a quick look in Documentation/devicetree/bindings/net/can, it
seems a bit of a wild west. No standardization, no central binding
which CAN drivers are expected to support, etc. This sounds like a
generic problem, not an mcan problem. So document this property
centrally, implement the parsing of it centrally, etc, to encourage
other CAN drivers to use it, rather than re-invent the wheel.

	   Andrew