You give the phandle of your emac node as argument, that
works just fine with what I proposed too (the SoC PM node
knows the phandles of the emac's).  I think your way isn't
all that clean architecturally and can easily lead to
problems later on; the emac shouldn't have to know *anything*
about the structure of the SoC.

But feel free to do what you want, it's certainly not
a *huge* problem ;-)

Well, we use that method for most things,for example, the emac has
phandles to the zmii/rgmii/etc... for that specific case however, I
still prefer a cell index.

Ben.