diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index a13a7005ffa0..9d62e4acc01b 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -1026,6 +1026,38 @@ static void mv88e6xxx_port_stp_state_set(struct dsa_switch *ds, int port,
 		dev_err(ds->dev, "p%d: failed to update state\n", port);
 }
 
+static int mv88e6xxx_devmap_setup(struct mv88e6xxx_chip *chip)
+{
+	int target, port;
+	int err;
+
+	if (!chip->info->global2_addr)
+		return 0;
+
+	/* Initialize the routing port to the 32 possible target devices */
+	for (target = 0; target < 32; target++) {
+		port = 0x1f;
+		if (target < DSA_MAX_SWITCHES)
+			if (chip->ds->rtable[target] != DSA_RTABLE_NONE)
+				port = chip->ds->rtable[target];
+
+		err = mv88e6xxx_g2_device_mapping_write(chip, target, port);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+static int mv88e6xxx_trunk_setup(struct mv88e6xxx_chip *chip)
+{
+	/* Clear all trunk masks and mapping */
+	if (chip->info->global2_addr)
+		return mv88e6xxx_g2_trunk_clear(chip);
+
+	return 0;
+}
+
 static int mv88e6xxx_pot_setup(struct mv88e6xxx_chip *chip)
 {
 	if (chip->info->ops->pot_clear)
@@ -2196,13 +2228,6 @@ static int mv88e6xxx_setup(struct dsa_switch *ds)
 	if (err)
 		goto unlock;
 
-	/* Setup Switch Global 2 Registers */
-	if (chip->info->global2_addr) {
-		err = mv88e6xxx_g2_setup(chip);
-		if (err)
-			goto unlock;
-	}
-
 	err = mv88e6xxx_irl_setup(chip);
 	if (err)
 		goto unlock;
@@ -2239,6 +2264,14 @@ static int mv88e6xxx_setup(struct dsa_switch *ds)
 	if (err)
 		goto unlock;
 
+	err = mv88e6xxx_trunk_setup(chip);
+	if (err)
+		goto unlock;
+
+	err = mv88e6xxx_devmap_setup(chip);
+	if (err)
+		goto unlock;
+
 	/* Setup PTP Hardware Clock and timestamping */
 	if (chip->info->ptp_support) {
 		err = mv88e6xxx_ptp_setup(chip);
diff --git a/drivers/net/dsa/mv88e6xxx/global2.c b/drivers/net/dsa/mv88e6xxx/global2.c
index 0ce627fded48..e6d658181b27 100644
--- a/drivers/net/dsa/mv88e6xxx/global2.c
+++ b/drivers/net/dsa/mv88e6xxx/global2.c
@@ -119,37 +119,17 @@ int mv88e6352_g2_mgmt_rsvd2cpu(struct mv88e6xxx_chip *chip)
 
 /* Offset 0x06: Device Mapping Table register */
 
-static int mv88e6xxx_g2_device_mapping_write(struct mv88e6xxx_chip *chip,
-					     int target, int port)
+int mv88e6xxx_g2_device_mapping_write(struct mv88e6xxx_chip *chip, int target,
+				      int port)
 {
-	u16 val = (target << 8) | (port & 0xf);
+	u16 val = (target << 8) | (port & 0x1f);
+	/* Modern chips use 5 bits to define a device mapping port,
+	 * but bit 4 is reserved on older chips, so it is safe to use.
+	 */
 
 	return mv88e6xxx_g2_update(chip, MV88E6XXX_G2_DEVICE_MAPPING, val);
 }
 
-static int mv88e6xxx_g2_set_device_mapping(struct mv88e6xxx_chip *chip)
-{
-	int target, port;
-	int err;
-
-	/* Initialize the routing port to the 32 possible target devices */
-	for (target = 0; target < 32; ++target) {
-		port = 0xf;
-
-		if (target < DSA_MAX_SWITCHES) {
-			port = chip->ds->rtable[target];
-			if (port == DSA_RTABLE_NONE)
-				port = 0xf;
-		}
-
-		err = mv88e6xxx_g2_device_mapping_write(chip, target, port);
-		if (err)
-			break;
-	}
-
-	return err;
-}
-
 /* Offset 0x07: Trunk Mask Table register */
 
 static int mv88e6xxx_g2_trunk_mask_write(struct mv88e6xxx_chip *chip, int num,
@@ -174,7 +154,7 @@ static int mv88e6xxx_g2_trunk_mapping_write(struct mv88e6xxx_chip *chip, int id,
 	return mv88e6xxx_g2_update(chip, MV88E6XXX_G2_TRUNK_MAPPING, val);
 }
 
-static int mv88e6xxx_g2_clear_trunk(struct mv88e6xxx_chip *chip)
+int mv88e6xxx_g2_trunk_clear(struct mv88e6xxx_chip *chip)
 {
 	const u16 port_mask = BIT(mv88e6xxx_num_ports(chip)) - 1;
 	int i, err;
@@ -1138,31 +1118,3 @@ void mv88e6xxx_g2_irq_mdio_free(struct mv88e6xxx_chip *chip,
 	for (phy = 0; phy < chip->info->num_internal_phys; phy++)
 		irq_dispose_mapping(bus->irq[phy]);
 }
-
-int mv88e6xxx_g2_setup(struct mv88e6xxx_chip *chip)
-{
-	u16 reg;
-	int err;
-
-	/* Ignore removed tag data on doubly tagged packets, disable
-	 * flow control messages, force flow control priority to the
-	 * highest, and send all special multicast frames to the CPU
-	 * port at the highest priority.
-	 */
-	reg = MV88E6XXX_G2_SWITCH_MGMT_FORCE_FLOW_CTL_PRI | (0x7 << 4);
-	err = mv88e6xxx_g2_write(chip, MV88E6XXX_G2_SWITCH_MGMT, reg);
-	if (err)
-		return err;
-
-	/* Program the DSA routing table. */
-	err = mv88e6xxx_g2_set_device_mapping(chip);
-	if (err)
-		return err;
-
-	/* Clear all trunk masks and mapping. */
-	err = mv88e6xxx_g2_clear_trunk(chip);
-	if (err)
-		return err;
-
-	return 0;
-}
diff --git a/drivers/net/dsa/mv88e6xxx/global2.h b/drivers/net/dsa/mv88e6xxx/global2.h
index 520ec70d32e8..37e8ce2c72a0 100644
--- a/drivers/net/dsa/mv88e6xxx/global2.h
+++ b/drivers/net/dsa/mv88e6xxx/global2.h
@@ -60,7 +60,8 @@
 #define MV88E6XXX_G2_DEVICE_MAPPING		0x06
 #define MV88E6XXX_G2_DEVICE_MAPPING_UPDATE	0x8000
 #define MV88E6XXX_G2_DEVICE_MAPPING_DEV_MASK	0x1f00
-#define MV88E6XXX_G2_DEVICE_MAPPING_PORT_MASK	0x000f
+#define MV88E6352_G2_DEVICE_MAPPING_PORT_MASK	0x000f
+#define MV88E6390_G2_DEVICE_MAPPING_PORT_MASK	0x001f
 
 /* Offset 0x07: Trunk Mask Table Register */
 #define MV88E6XXX_G2_TRUNK_MASK			0x07
@@ -313,7 +314,6 @@ int mv88e6xxx_g2_pvt_write(struct mv88e6xxx_chip *chip, int src_dev,
 			   int src_port, u16 data);
 int mv88e6xxx_g2_misc_4_bit_port(struct mv88e6xxx_chip *chip);
 
-int mv88e6xxx_g2_setup(struct mv88e6xxx_chip *chip);
 int mv88e6xxx_g2_irq_setup(struct mv88e6xxx_chip *chip);
 void mv88e6xxx_g2_irq_free(struct mv88e6xxx_chip *chip);
 
@@ -327,6 +327,11 @@ int mv88e6352_g2_mgmt_rsvd2cpu(struct mv88e6xxx_chip *chip);
 
 int mv88e6xxx_g2_pot_clear(struct mv88e6xxx_chip *chip);
 
+int mv88e6xxx_g2_trunk_clear(struct mv88e6xxx_chip *chip);
+
+int mv88e6xxx_g2_device_mapping_write(struct mv88e6xxx_chip *chip, int target,
+				      int port);
+
 extern const struct mv88e6xxx_irq_ops mv88e6097_watchdog_ops;
 extern const struct mv88e6xxx_irq_ops mv88e6390_watchdog_ops;
 
@@ -441,11 +446,6 @@ static inline int mv88e6xxx_g2_misc_4_bit_port(struct mv88e6xxx_chip *chip)
 	return -EOPNOTSUPP;
 }
 
-static inline int mv88e6xxx_g2_setup(struct mv88e6xxx_chip *chip)
-{
-	return -EOPNOTSUPP;
-}
-
 static inline int mv88e6xxx_g2_irq_setup(struct mv88e6xxx_chip *chip)
 {
 	return -EOPNOTSUPP;
@@ -495,6 +495,17 @@ static inline int mv88e6xxx_g2_scratch_gpio_set_smi(struct mv88e6xxx_chip *chip,
 	return -EOPNOTSUPP;
 }
 
+static inline int mv88e6xxx_g2_trunk_clear(struct mv88e6xxx_chip *chip)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int mv88e6xxx_g2_device_mapping_write(struct mv88e6xxx_chip *chip,
+						    int target, int port)
+{
+	return -EOPNOTSUPP;
+}
+
 #endif /* CONFIG_NET_DSA_MV88E6XXX_GLOBAL2 */
 
 #endif /* _MV88E6XXX_GLOBAL2_H */