diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index 49fc31fe0db8..97bd2ee8a010 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -1488,6 +1488,7 @@ static bool mvpp2_port_supports_rgmii(struct mvpp2_port *port)
 static bool mvpp2_is_xlg(phy_interface_t interface)
 {
 	return interface == PHY_INTERFACE_MODE_10GBASER ||
+	       interface == PHY_INTERFACE_MODE_5GBASER ||
 	       interface == PHY_INTERFACE_MODE_XAUI;
 }
 
@@ -1627,6 +1628,7 @@ static int mvpp22_gop_init(struct mvpp2_port *port, phy_interface_t interface)
 	case PHY_INTERFACE_MODE_2500BASEX:
 		mvpp22_gop_init_sgmii(port);
 		break;
+	case PHY_INTERFACE_MODE_5GBASER:
 	case PHY_INTERFACE_MODE_10GBASER:
 		if (!mvpp2_port_supports_xlg(port))
 			goto invalid_conf;
@@ -2186,6 +2188,7 @@ static void mvpp22_pcs_reset_deassert(struct mvpp2_port *port,
 	xpcs = priv->iface_base + MVPP22_XPCS_BASE(port->gop_id);
 
 	switch (interface) {
+	case PHY_INTERFACE_MODE_5GBASER:
 	case PHY_INTERFACE_MODE_10GBASER:
 		val = readl(mpcs + MVPP22_MPCS_CLK_RESET);
 		val |= MAC_CLK_RESET_MAC | MAC_CLK_RESET_SD_RX |
@@ -6124,7 +6127,10 @@ static void mvpp2_xlg_pcs_get_state(struct phylink_pcs *pcs,
 	struct mvpp2_port *port = mvpp2_pcs_to_port(pcs);
 	u32 val;
 
-	state->speed = SPEED_10000;
+	if (port->phy_interface == PHY_INTERFACE_MODE_5GBASER)
+		state->speed = SPEED_5000;
+	else
+		state->speed = SPEED_10000;
 	state->duplex = 1;
 	state->an_complete = 1;
 
@@ -6877,12 +6883,36 @@ static int mvpp2_port_probe(struct platform_device *pdev,
 				MAC_SYM_PAUSE | MAC_ASYM_PAUSE;
 
 		if (mvpp2_port_supports_xlg(port)) {
-			__set_bit(PHY_INTERFACE_MODE_10GBASER,
-				  port->phylink_config.supported_interfaces);
-			__set_bit(PHY_INTERFACE_MODE_XAUI,
-				  port->phylink_config.supported_interfaces);
-			port->phylink_config.mac_capabilities |=
-				MAC_10000FD;
+			/* If a COMPHY is present, we can support any of
+			 * the serdes modes and switch between them.
+			 */
+			if (comphy) {
+				__set_bit(PHY_INTERFACE_MODE_5GBASER,
+					  port->phylink_config.supported_interfaces);
+				__set_bit(PHY_INTERFACE_MODE_10GBASER,
+					  port->phylink_config.supported_interfaces);
+				__set_bit(PHY_INTERFACE_MODE_XAUI,
+					  port->phylink_config.supported_interfaces);
+			} else if (phy_mode == PHY_INTERFACE_MODE_5GBASER) {
+				__set_bit(PHY_INTERFACE_MODE_5GBASER,
+					  port->phylink_config.supported_interfaces);
+			} else if (phy_mode == PHY_INTERFACE_MODE_10GBASER) {
+				__set_bit(PHY_INTERFACE_MODE_10GBASER,
+					  port->phylink_config.supported_interfaces);
+			} else if (phy_mode == PHY_INTERFACE_MODE_XAUI) {
+				__set_bit(PHY_INTERFACE_MODE_XAUI,
+					  port->phylink_config.supported_interfaces);
+			}
+
+			if (comphy)
+				port->phylink_config.mac_capabilities |=
+					MAC_10000FD | MAC_5000FD;
+			else if (phy_mode == PHY_INTERFACE_MODE_5GBASER)
+				port->phylink_config.mac_capabilities |=
+					MAC_5000FD;
+			else
+				port->phylink_config.mac_capabilities |=
+					MAC_10000FD;
 		}
 
 		if (mvpp2_port_supports_rgmii(port))
diff --git a/drivers/phy/marvell/phy-mvebu-cp110-comphy.c b/drivers/phy/marvell/phy-mvebu-cp110-comphy.c
index bbd6f2ad6f24..34672e868a1e 100644
--- a/drivers/phy/marvell/phy-mvebu-cp110-comphy.c
+++ b/drivers/phy/marvell/phy-mvebu-cp110-comphy.c
@@ -141,6 +141,7 @@
 #define COMPHY_FW_SPEED_1250	0
 #define COMPHY_FW_SPEED_3125	2
 #define COMPHY_FW_SPEED_5000	3
+#define COMPHY_FW_SPEED_515625	4
 #define COMPHY_FW_SPEED_103125	6
 #define COMPHY_FW_PORT_OFFSET	8
 #define COMPHY_FW_PORT_MASK	GENMASK(11, 8)
@@ -220,6 +221,7 @@ static const struct mvebu_comphy_conf mvebu_comphy_cp110_modes[] = {
 	ETH_CONF(2, 0, PHY_INTERFACE_MODE_SGMII, 0x1, COMPHY_FW_MODE_SGMII),
 	ETH_CONF(2, 0, PHY_INTERFACE_MODE_2500BASEX, 0x1, COMPHY_FW_MODE_2500BASEX),
 	ETH_CONF(2, 0, PHY_INTERFACE_MODE_RXAUI, 0x1, COMPHY_FW_MODE_RXAUI),
+	ETH_CONF(2, 0, PHY_INTERFACE_MODE_5GBASER, 0x1, COMPHY_FW_MODE_XFI),
 	ETH_CONF(2, 0, PHY_INTERFACE_MODE_10GBASER, 0x1, COMPHY_FW_MODE_XFI),
 	GEN_CONF(2, 0, PHY_MODE_USB_HOST_SS, COMPHY_FW_MODE_USB3H),
 	GEN_CONF(2, 0, PHY_MODE_SATA, COMPHY_FW_MODE_SATA),
@@ -234,6 +236,7 @@ static const struct mvebu_comphy_conf mvebu_comphy_cp110_modes[] = {
 	/* lane 4 */
 	ETH_CONF(4, 0, PHY_INTERFACE_MODE_SGMII, 0x2, COMPHY_FW_MODE_SGMII),
 	ETH_CONF(4, 0, PHY_INTERFACE_MODE_2500BASEX, 0x2, COMPHY_FW_MODE_2500BASEX),
+	ETH_CONF(4, 0, PHY_INTERFACE_MODE_5GBASER, 0x2, COMPHY_FW_MODE_XFI),
 	ETH_CONF(4, 0, PHY_INTERFACE_MODE_10GBASER, 0x2, COMPHY_FW_MODE_XFI),
 	ETH_CONF(4, 0, PHY_INTERFACE_MODE_RXAUI, 0x2, COMPHY_FW_MODE_RXAUI),
 	GEN_CONF(4, 0, PHY_MODE_USB_DEVICE_SS, COMPHY_FW_MODE_USB3D),
@@ -241,6 +244,7 @@ static const struct mvebu_comphy_conf mvebu_comphy_cp110_modes[] = {
 	GEN_CONF(4, 1, PHY_MODE_PCIE, COMPHY_FW_MODE_PCIE),
 	ETH_CONF(4, 1, PHY_INTERFACE_MODE_SGMII, 0x1, COMPHY_FW_MODE_SGMII),
 	ETH_CONF(4, 1, PHY_INTERFACE_MODE_2500BASEX, -1, COMPHY_FW_MODE_2500BASEX),
+	ETH_CONF(4, 1, PHY_INTERFACE_MODE_5GBASER, -1, COMPHY_FW_MODE_XFI),
 	ETH_CONF(4, 1, PHY_INTERFACE_MODE_10GBASER, -1, COMPHY_FW_MODE_XFI),
 	/* lane 5 */
 	ETH_CONF(5, 1, PHY_INTERFACE_MODE_RXAUI, 0x2, COMPHY_FW_MODE_RXAUI),
@@ -790,6 +794,11 @@ static int mvebu_comphy_power_on(struct phy *phy)
 				lane->id);
 			fw_speed = COMPHY_FW_SPEED_3125;
 			break;
+		case PHY_INTERFACE_MODE_5GBASER:
+			dev_dbg(priv->dev, "set lane %d to 5GBASE-R mode\n",
+				lane->id);
+			fw_speed = COMPHY_FW_SPEED_515625;
+			break;
 		case PHY_INTERFACE_MODE_10GBASER:
 			dev_dbg(priv->dev, "set lane %d to 10GBASE-R mode\n",
 				lane->id);