I like this. The nice thing is that since "name" is a string, we're not
locked into an enum -- drivers report what they have using 802.3
vocabulary, and we document the recommended names (pcs, pma, pmd, mii)
with references? That way it's unambiguous, but not too constrained.

It is both good and bad. I expect some vendors will just ignore the
text and use what their data sheet says, because they don't know
better. An enum forces more consistency.

https://gist.github.com/mjball/9cd028ac793ae8b351df1379f1e721f9

enum gets you around level 9. string around level 3.

	Andrew