net: dsa: mv88e6xxx: protect SID register access
Introduce a mv88e6xxx_has_stu() helper to protect the access to the GLOBAL_VTU_SID register, instead of checking switch families. Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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