net: dsa: mv88e6xxx: factorize bridge support

Add MV88E6XXX_FLAG_PORTSTATE and MV88E6XXX_FLAG_VLANTABLE flags to
identify switch models with required 802.1D operations.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/dsa/mv88e6xxx.c b/drivers/net/dsa/mv88e6xxx.c
index c28ad83..f02738e 100644
--- a/drivers/net/dsa/mv88e6xxx.c
+++ b/drivers/net/dsa/mv88e6xxx.c
@@ -1369,6 +1369,9 @@
 	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
 	int stp_state;
 
+	if (!mv88e6xxx_has(ps, MV88E6XXX_FLAG_PORTSTATE))
+		return;
+
 	switch (state) {
 	case BR_STATE_DISABLED:
 		stp_state = PORT_CONTROL_STATE_DISABLED;
@@ -2430,6 +2433,9 @@
 	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
 	int i, err = 0;
 
+	if (!mv88e6xxx_has(ps, MV88E6XXX_FLAG_VLANTABLE))
+		return -EOPNOTSUPP;
+
 	mutex_lock(&ps->smi_mutex);
 
 	/* Assign the bridge and remap each port's VLANTable */
@@ -2454,6 +2460,9 @@
 	struct net_device *bridge = ps->ports[port].bridge_dev;
 	int i;
 
+	if (!mv88e6xxx_has(ps, MV88E6XXX_FLAG_VLANTABLE))
+		return;
+
 	mutex_lock(&ps->smi_mutex);
 
 	/* Unassign the bridge and remap each port's VLANTable */