Merge branch 'net-dsa-lantiq_gswip-prepare-for-supporting-maxlinear-gsw1xx'

Merge branch 'net-dsa-lantiq_gswip-prepare-for-supporting-maxlinear-gsw1xx'

Daniel Golle says:

====================
net: dsa: lantiq_gswip: prepare for supporting MaxLinear GSW1xx

Continue to prepare for supporting the newer standalone MaxLinear GSW1xx
switch family by extending the existing lantiq_gswip driver to allow it
to support MII interfaces and MDIO bus of the GSW1xx.

This series has been preceded by an RFC series which covers everything
needed to support the MaxLinear GSW1xx family of switches. Andrew Lunn
had suggested to split it into a couple of smaller series and start
with the changes which don't yet make actual functional changes or
support new features.

Everything has been compile and runtime tested on AVM Fritz!Box 7490
(GSWIP version 2.1, VR9 v1.2)

Link: https://lore.kernel.org/netdev/aKDhFCNwjDDwRKsI@pidgin.makrotopia.org/
====================

Link: https://patch.msgid.link/cover.1756520811.git.daniel@makrotopia.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>