Merge branch 'phy-25g'

Maxime Chevallier says:

====================
net: phy: Add 2.5G/5GBASET PHYs support

The 802.3bz standard defines 2 modes based on the NBASET alliance work
that allow to use 2.5Gbps and 5Gbps speeds on Cat 5e, 6 and 7 cables.

This series adds the necessary infrastructure to handle these modes with
C45 PHYs. This series was originally part of a bigger one, that has
seen 2 iterations [1] [2] that added support for these modes on Marvell
Alaska PHYs.

Following some discussions with Heiner and Andrew [3], we decided to
split-out the generic parts so that we can work together on the
following steps to get these mode fully working with Aquantia and
Marvell PHYS.

The first 3 patches are reworking some of the internal network phy
infrastructure to handle the new modes in a more generic way.

The 4th patch adds all the C45 register definition and accesses that
follows the 802.3bz standard to support 2.5GBASET and 5GBASET.

[1] : https://lore.kernel.org/netdev/20190118152352.26417-1-maxime.chevallier@bootlin.com/
[2] : https://lore.kernel.org/netdev/20190207094939.27369-1-maxime.chevallier@bootlin.com/
[3] : https://lore.kernel.org/netdev/81c340ea-54b0-1abf-94af-b8dc4ee83e3a@gmail.com/
====================

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

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