Index: sys/arm64/conf/std.marvell
===================================================================
--- sys/arm64/conf/std.marvell
+++ sys/arm64/conf/std.marvell
@@ -44,6 +44,10 @@
 device		miiproxy		# Required for etherswitch
 device		e6000sw			# Marvell mv88e6085 based switches
 
+# Special support for miiphy attached to gpiomdio instead of neta.
+device		gpiomdio		# GPIO MDIO bus bit-banging driver
+device		mii_bitbang		# Need this explicitly for conf/files.
+
 # USB support
 device		ehci_mv			# Marvell EHCI USB interface
 
Index: sys/dev/mii/e1000phy.c
===================================================================
--- sys/dev/mii/e1000phy.c
+++ sys/dev/mii/e1000phy.c
@@ -111,6 +111,7 @@
 	MII_PHY_DESC(xxMARVELL, E1116R_29),
 	MII_PHY_DESC(xxMARVELL, E1118),
 	MII_PHY_DESC(xxMARVELL, E1145),
+	MII_PHY_DESC(xxMARVELL, E1512),
 	MII_PHY_DESC(xxMARVELL, E1149R),
 	MII_PHY_DESC(xxMARVELL, E3016),
 	MII_PHY_DESC(xxMARVELL, PHYG65G),
Index: sys/dev/mii/miidevs
===================================================================
--- sys/dev/mii/miidevs
+++ sys/dev/mii/miidevs
@@ -271,6 +271,7 @@
 model xxMARVELL E1149		0x000b Marvell 88E1149 Gigabit PHY
 model xxMARVELL E1111		0x000c Marvell 88E1111 Gigabit PHY
 model xxMARVELL E1145		0x000d Marvell 88E1145 Quad Gigabit PHY
+model xxMARVELL E1512		0x001d Marvell 88E151[0248] Gigabit PHY
 model xxMARVELL E1116		0x0021 Marvell 88E1116 Gigabit PHY
 model xxMARVELL E1116R		0x0024 Marvell 88E1116R Gigabit PHY
 model xxMARVELL E1118		0x0022 Marvell 88E1118 Gigabit PHY
Index: sys/dev/neta/if_mvneta.c
===================================================================
--- sys/dev/neta/if_mvneta.c
+++ sys/dev/neta/if_mvneta.c
@@ -731,9 +731,9 @@
 
 	/* Attach PHY(s) */
 	if ((sc->phy_addr != MII_PHY_ANY) && (!sc->use_inband_status)) {
-		error = mii_attach(self, &sc->miibus, ifp, mvneta_mediachange,
-		    mvneta_mediastatus, BMSR_DEFCAPMASK, sc->phy_addr,
-		    MII_OFFSET_ANY, 0);
+		error = mii_attach(sc->phy_dev, &sc->miibus, ifp,
+		    mvneta_mediachange, mvneta_mediastatus,
+		    BMSR_DEFCAPMASK, sc->phy_addr, MII_OFFSET_ANY, 0);
 		if (error != 0) {
 			if (bootverbose) {
 				device_printf(self,
Index: sys/dev/neta/if_mvneta_fdt.c
===================================================================
--- sys/dev/neta/if_mvneta_fdt.c
+++ sys/dev/neta/if_mvneta_fdt.c
@@ -111,6 +111,7 @@
 	int err;
 
 	sc = device_get_softc(dev);
+	sc->phy_dev = dev;
 
 	/* Try to fetch PHY information from FDT */
 	err = mvneta_fdt_phy_acquire(dev);
@@ -141,6 +142,7 @@
 mvneta_fdt_phy_acquire(device_t dev)
 {
 	struct mvneta_softc *sc;
+	device_t phy_dev;
 	phandle_t node, child, phy_handle;
 	char phymode[PHY_MODE_MAXLEN];
 	char managed[INBAND_STATUS_MAXLEN];
@@ -218,6 +220,14 @@
 			    "Could not find PHY address in FDT.\n");
 			return (ENXIO);
 		}
+		/* See if we have a "gpiomdio" device. */
+		phy_dev = OF_device_from_xref(OF_parent(phy_handle));
+		if (phy_dev != NULL && phy_dev != dev) {
+			sc->phy_dev = phy_dev;
+			if (bootverbose)
+				device_printf(dev, "Switching PHY dev to %s\n",
+				    device_get_nameunit(phy_dev));
+		}
 	}
 
 	return (0);
Index: sys/dev/neta/if_mvnetavar.h
===================================================================
--- sys/dev/neta/if_mvnetavar.h
+++ sys/dev/neta/if_mvnetavar.h
@@ -269,6 +269,7 @@
 	enum mvneta_phy_mode	phy_mode;
 	int			phy_addr;
 	int			phy_speed;	/* PHY speed */
+	device_t		phy_dev;
 	boolean_t		phy_fdx;	/* Full duplex mode */
 	boolean_t		autoneg;	/* Autonegotiation status */
 	boolean_t		use_inband_status;	/* In-band link status */