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Realizing now that the i3c attach device is optional and i3c as a whole really wants to know about all the devices attached to it, so I need to create child nodes for each mctp endpoint on the i3c bus with a pseudo compatible I guess, then link those to the mctp controller in some manner with I guess phandles. Really I just wanted a list of id pairs but this isn't doable with devicetree and i3c today.
Upon further reading its clear to support i3c and mctp I need to support
hot joining.
There's still work to verify the i3c device is an MCTP device by
checking its DCR and watching for the correct IBI response.
In discussion with @dcpleung I should be able to always use the provisional id, so I can always know then what devices should exist on the bus with devicetree statically even if they are dynamically hot joining later. Makes sense to me! This isn't USB though in some ways its kind of acting like it.
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Adds bindings for communicating with the MCTP protocol over I3C.
Note
In draft until I get this working on hardware, in particular the npcx4