mvebu: eDPU: add support for version with external switch

New revision of eDPU uses an Marvell MV88E6361 switch to connect the SFP
cage and G.hn IC instead of connecting them directly to the ethernet
controllers.

The same image can be used on both versions as U-Boot will enable the
switch node and disable the unused ethernet controller.

Signed-off-by: Robert Marko <[email protected]>

target/linux/mvebu/cortexa53/base-files/etc/board.d/02_network

@@ -21,9 +21,16 @@ globalscale,espressobin-ultra)
 	ucidef_set_interfaces_lan_wan "lan0 lan1 lan2 lan3" "wan"
 	;;
 marvell,armada-3720-db|\
-methode,udpu|\
+methode,udpu)
+	ucidef_set_interfaces_lan_wan "eth1" "eth0"
+	;;
 methode,edpu)
+	# eDPU+ has a 88E6361 switch, so we check for it
+	if ip link | grep -q uplink; then
+	ucidef_set_interfaces_lan_wan "downlink" "uplink"
+	else
 	ucidef_set_interfaces_lan_wan "eth1" "eth0"
+	fi
 	;;
 *)
 	ucidef_set_interface_lan "eth0"

target/linux/mvebu/files/arch/arm64/boot/dts/marvell/armada-3720-eDPU.dts

@@ -17,3 +17,50 @@
 &eth0 {
 	phy-mode = "1000base-x";
 };
+
+/*
+ * External MV88E6361 switch is only available on v2 of the board.
+ * U-Boot will enable the MDIO bus and switch nodes.
+ */
+&mdio {
+	status = "disabled";
+	pinctrl-names = "default";
+	pinctrl-0 = <&smi_pins>;
+
+	/* Actual device is MV88E6361 */
+	switch: switch@0 {
+		compatible = "marvell,mv88e6190";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		reg = <0>;
+		status = "disabled";
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@0 {
+				reg = <0>;
+				label = "cpu";
+				phy-mode = "2500base-x";
+				managed = "in-band-status";
+				ethernet = <&eth0>;
+			};
+
+			port@9 {
+				reg = <9>;
+				label = "downlink";
+				phy-mode = "2500base-x";
+				managed = "in-band-status";
+			};
+
+			port@a {
+				reg = <10>;
+				label = "uplink";
+				phy-mode = "2500base-x";
+				managed = "in-band-status";
+				sfp = <&sfp_eth1>;
+			};
+		};
+	};
+};