Only a small subset has been seen in the wild inside RealTek switches
for now. Most, of course, come with RealTek switches. However, it is
only very recently that RealTek offers 10G PHYs, so before vendors
were using 10G PHYs of other vendors, in practise I've only seen
Aquantia.

...

Yes, that does sound better, especially with your concern about
->supported mask not necessarily being correct at probe time in mind.

FYI: The Aquantia PHYs are particularly bad with ->supported.

	Andrew