net: dsa: mv88e6xxx: Factor out common initialization code

Code used and needed in mv886xxx.c should be initialized there as well,
so factor it out from the individual initialization files.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/dsa/mv88e6xxx.c b/drivers/net/dsa/mv88e6xxx.c
index c18ffc9..6496beb 100644
--- a/drivers/net/dsa/mv88e6xxx.c
+++ b/drivers/net/dsa/mv88e6xxx.c
@@ -700,6 +700,17 @@
 	return 0;
 }
 
+int mv88e6xxx_setup_common(struct dsa_switch *ds)
+{
+	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
+
+	mutex_init(&ps->smi_mutex);
+	mutex_init(&ps->stats_mutex);
+	mutex_init(&ps->phy_mutex);
+
+	return 0;
+}
+
 static int __init mv88e6xxx_init(void)
 {
 #if IS_ENABLED(CONFIG_NET_DSA_MV88E6131)