Re:

quoted

So there is a gap in the revisions. Maybe a B2 exists?

Actually, probably not. Some search gives this datasheet:

https://ww1.microchip.com/downloads/aemDocuments/documents/AIS/ProductDocuments/DataSheets/LAN8670-1-2-Data-Sheet-60001573.pdf

And page 2 (table 1) shows only revisions A0 (rev0), B1, (rev2), C1 (rev4).
Not sure about why only even revision numbers are released ?

Page 193 (table 10-1) also shows only B1 and C1. So you can be confident that only those exist.

Thanks for clearing that up!

@Ramón, thank you for your work on this driver!

Much appreciated
R