I think we need a better solution than spending the effort needed
to make the MDIO ops runtime-pm-aware. In general there seems to be
just one network driver using both phylib and runtime pm, so most
drivers aren't affected (yet).

I will spend few more thoughts on a solution ..

Hi Heiner

Please keep in mind that MDIO is a generic bus. Many Ethernet switches
are connected via MDIO. Some of those switches have MDIO busses of
their own. Also, some Broadcom devices have USB-PHYs controlled over
MDIO, etc.

So you need a generic solution here.

   Andrew