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