net: phy: marvell: support downshift as PHY tunable

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So far downshift is implemented for one small use case only and can't
be controlled from userspace. So let's implement this feature properly
as a PHY tunable so that it can be controlled via ethtool.
More Marvell PHY's may support downshift, but I restricted it for now
to the ones where I have the datasheet.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Heiner Kallweit 2019-10-19 15:57:33 +02:00 • committed by David S. Miller

parent a8fad5459d

commit a3bdfce7bf

1 changed files with 87 additions and 1 deletions

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drivers/net/phy/marvell.c

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