net: dsa: mv88e6xxx: helper to setup upstream port
Add a helper function to setup the upstream port of a given port. This is the port used to reach the dedicated CPU port. This function will be extended later to setup the global upstream port as well. Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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