diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index ee85a14853f51ba21d68f79e97b16c04b3bc6481..96fa2da307630f1e46df75441af10c91f0fd4c79 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -307,7 +307,7 @@ static int stmmac_init_phy(struct net_device *dev)
 	priv->speed = 0;
 	priv->oldduplex = -1;
 
-	snprintf(bus_id, MII_BUS_ID_SIZE, "%x", priv->plat->bus_id);
+	snprintf(bus_id, MII_BUS_ID_SIZE, "stmmac-%x", priv->plat->bus_id);
 	snprintf(phy_id, MII_BUS_ID_SIZE + 3, PHY_ID_FMT, bus_id,
 		 priv->plat->phy_addr);
 	pr_debug("stmmac_init_phy:  trying to attach to %s\n", phy_id);
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
index 51f4412339627c4a09cbd1ac0fae90ddd1d4f40d..da4a1042523a633e5781f86df7ffe4e123c09910 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
@@ -158,7 +158,8 @@ int stmmac_mdio_register(struct net_device *ndev)
 	new_bus->read = &stmmac_mdio_read;
 	new_bus->write = &stmmac_mdio_write;
 	new_bus->reset = &stmmac_mdio_reset;
-	snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", mdio_bus_data->bus_id);
+	snprintf(new_bus->id, MII_BUS_ID_SIZE, "%s-%x",
+		new_bus->name, mdio_bus_data->bus_id);
 	new_bus->priv = ndev;
 	new_bus->irq = irqlist;
 	new_bus->phy_mask = mdio_bus_data->phy_mask;