net: phy: marvell: add PHY tunable fast link down support for
88E1540
1000BaseT standard requires that a link is reported as down earliest
after 750ms. Several use case however require a much faster detecion
of a broken link. Fast Link Down supports this by intentionally
violating a the standard. This patch exposes the Fast Link Down
feature of
88E1540 and
88E6390. These PHY's can be found as internal
PHY's in several switches:
88E6352,
88E6240,
88E6176,
88E6172,
and
88E6390(X). Fast Link Down and EEE are mutually exclusive.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>