On Fri, Nov 20, 2020 at 10:25:38AM +0000, Russell King - ARM Linux admin wrote:
> On Fri, Nov 20, 2020 at 10:36:01AM +0100, Maxime Chevallier wrote:
> > So maybe we could be a bit more generic, with something along these lines :
> >
> > ethernet-phy@0 {
> > ...
> >
> > mdi {
> > port@0 {
> > media = "10baseT", "100baseT", "1000baseT";
> > pairs = <1>;
> > };
> >
> > port@1 {
> > media = "1000baseX", "10gbaseR"
> > };
> > };
> > };
>
> Don't forget that TP requires a minimum of two pairs.
Hi Russell
Well, actually, there are automotive PHYs which use just one pair, so
called T1 PHYs. We have drivers for i think two so far, with one more
on the way.
You also have to watch out for 'clever' PHYs. The Aquantia PHY can do
1000Base-T2, i.e. 1G over two pairs. This might be a proprietary
extension, rather than standardized, but it shows it can be done. So
you have to be careful about assumptions based on the number of pairs.
Andrew
