net: lan966x: Add QUSGMII support for lan966x
The Lan996x controller supports the QUSGMII mode, which is very similar to QSGMII in the way it's configured and the autonegociation capababilities it provides. This commit adds support for that mode, treating it most of the time like QSGMII, making sure that we do configure the PCS how we should. Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
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