net: dsa: mv88e6xxx: factorize PHY indirect access
Some switch has dedicated SMI PHY Command and Data registers, used to indirectly access the PHYs, instead of direct access. Identify these switch models and make mv88e6xxx_phy_{read,write} generic enough to support every models. Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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