diff --git a/drivers/net/phy/adin.c b/drivers/net/phy/adin.c
index f4ee611e33df28505dfb60241948ea7a6016ee85..efbb732f03983c1f82e9e5346a604ed155175e61 100644
--- a/drivers/net/phy/adin.c
+++ b/drivers/net/phy/adin.c
@@ -14,6 +14,9 @@
 #define PHY_ID_ADIN1200				0x0283bc20
 #define PHY_ID_ADIN1300				0x0283bc30
 
+#define ADIN1300_MII_EXT_REG_PTR		0x0010
+#define ADIN1300_MII_EXT_REG_DATA		0x0011
+
 #define ADIN1300_INT_MASK_REG			0x0018
 #define   ADIN1300_INT_MDIO_SYNC_EN		BIT(9)
 #define   ADIN1300_INT_ANEG_STAT_CHNG_EN	BIT(8)
@@ -51,6 +54,33 @@ static int adin_phy_config_intr(struct phy_device *phydev)
 			      ADIN1300_INT_MASK_EN);
 }
 
+static int adin_read_mmd(struct phy_device *phydev, int devad, u16 regnum)
+{
+	struct mii_bus *bus = phydev->mdio.bus;
+	int phy_addr = phydev->mdio.addr;
+	int err;
+
+	err = __mdiobus_write(bus, phy_addr, ADIN1300_MII_EXT_REG_PTR, regnum);
+	if (err)
+		return err;
+
+	return __mdiobus_read(bus, phy_addr, ADIN1300_MII_EXT_REG_DATA);
+}
+
+static int adin_write_mmd(struct phy_device *phydev, int devad, u16 regnum,
+			  u16 val)
+{
+	struct mii_bus *bus = phydev->mdio.bus;
+	int phy_addr = phydev->mdio.addr;
+	int err;
+
+	err = __mdiobus_write(bus, phy_addr, ADIN1300_MII_EXT_REG_PTR, regnum);
+	if (err)
+		return err;
+
+	return __mdiobus_write(bus, phy_addr, ADIN1300_MII_EXT_REG_DATA, val);
+}
+
 static struct phy_driver adin_driver[] = {
 	{
 		PHY_ID_MATCH_MODEL(PHY_ID_ADIN1200),
@@ -62,6 +92,8 @@ static struct phy_driver adin_driver[] = {
 		.config_intr	= adin_phy_config_intr,
 		.resume		= genphy_resume,
 		.suspend	= genphy_suspend,
+		.read_mmd	= adin_read_mmd,
+		.write_mmd	= adin_write_mmd,
 	},
 	{
 		PHY_ID_MATCH_MODEL(PHY_ID_ADIN1300),
@@ -73,6 +105,8 @@ static struct phy_driver adin_driver[] = {
 		.config_intr	= adin_phy_config_intr,
 		.resume		= genphy_resume,
 		.suspend	= genphy_suspend,
+		.read_mmd	= adin_read_mmd,
+		.write_mmd	= adin_write_mmd,
 	},
 };