net: dsa: mv88e6xxx: move generic VTU GetNext
Even though every switch model has a different way to access the VTU Data bits, the base implementation of the VTU GetNext operation remains the same: wait, write the first VID to iterate from, start the operation, and read the next VID. Move this generic implementation into global1_vtu.c and abstract the handling of the start VID (similarly to the ATU GetNext implementation), before introducing a new chip operation for specific chips. Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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