Merge branch 'ocelot-external-ports'

Colin Foster says:

====================
add support for ocelot external ports

This is the start of part 3 of what is hopefully a 3-part series to add
Ethernet switching support to Ocelot chips.

Part 1 of the series (A New Chip) added general support for Ocelot chips
that were controlled externally via SPI.
https://lore.kernel.org/all/20220815005553.1450359-1-colin.foster@in-advantage.com/

Part 2 of the series (The Ethernet Strikes Back) added DSA Ethernet
support for ports 0-3, which are the four copper ports that are internal
to the chip.
https://lore.kernel.org/all/20230127193559.1001051-1-colin.foster@in-advantage.com/

Part 3 will, at a minimum, add support for ports 4-7, which are
configured to use QSGMII to an external phy (Return Of The QSGMII). With
any luck, and some guidance, support for SGMII, SFPs, etc. will also be
part of this series.

V1 was submitted as an RFC - and that was rightly so. I suspected I
wasn't doing something right, and that was certainly the case. V2 is
much cleaner, so hopefully upgrading it to PATCH status is welcomed.

Thanks to Russell and Vladimir for correcting my course from V1.

In V1 I included a device tree snippet. I won't repeat that here, but
I will include a boot log snippet, in case it is of use:
====================

Signed-off-by: David S. Miller <davem@davemloft.net>