phy: marvell: add link partner advertised modes
Read the standard link partner advertisment registers and store it in phydev->lp_advertising, so ethtool can report this information to userspace via ethtool. Zero it as per genphy if autonegotiation is disabled. Tested with a Marvell 88E1512 PHY. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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