From: Quentin Schulz <redacted>
Date: Thu,  4 Oct 2018 14:21:57 +0200

The Ocelot switch has currently an hardcoded SerDes muxing that suits only
a particular use case. Any other board setup will fail to work.

To prepare for upcoming boards' support that do not have the same muxing,
create a PHY driver that will handle all possible cases.

A SerDes can work in SGMII, QSGMII or PCIe and is also muxed to use a
given port depending on the selected mode or board design.

The SerDes configuration is in the middle of an address space (HSIO) that
is used to configure some parts in the MAC controller driver, that is why
we need to use a syscon so that we can write to the same address space from
different drivers safely using regmap.

This breaks backward compatibility but it's fine because there's only one
board at the moment that is using what's modified in this patch series.
This will break git bisect.

Even though this patch series is about SerDes __muxing__ configuration, the
DT node is named serdes for the simple reason that I couldn't find any
mention to SerDes anywhere else from the address space handled by this
driver.

Series applied to net-next, thanks.