mvebu: add Methode euroDPU support

Add support for Methode euroDPU which is based on uDPU but does not
have a second SFP cage, instead of which a Maxlinear G.hn IC is used.

PHY mode is set to 1000Base-X despite Maxlinear IC being capable of
2500Base-X since until 5.15 support for mvebu is available trying to use
2500Base-X will cause buffer overruns for which the fix is not easily
backportable.

Installation instructions:
1. Boot the FIT initramfs image (openwrt-mvebu-cortexa53-methode_edpu-initramfs.itb)
2. sysupgrade using the openwrt-mvebu-cortexa53-methode_edpu-firmware.tgz

Signed-off-by: Robert Marko <robert.marko@sartura.hr>

1 files changed, 19 insertions, 0 deletions

diff --git a/target/linux/mvebu/files/arch/arm64/boot/dts/marvell/armada-3720-eDPU.dts b/target/linux/mvebu/files/arch/arm64/boot/dts/marvell/armada-3720-eDPU.dts
new file mode 100644
index 0000000000..4db8b946df
--- /dev/null
+++ b/target/linux/mvebu/files/arch/arm64/boot/dts/marvell/armada-3720-eDPU.dts
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+/dts-v1/;
+
+#include "armada-3720-uDPU.dtsi"
+
+/ {
+	model = "Methode eDPU Board";
+	compatible = "methode,edpu", "marvell,armada3720", "marvell,armada3710";
+};
+
+/* PHY mode is set to 1000Base-X despite Maxlinear IC being capable of
+ * 2500Base-X since until 5.15 support for mvebu is available trying to
+ * use 2500Base-X will cause buffer overruns for which the fix is not
+ * easily backportable.
+ */
+&eth0 {
+	phy-mode = "1000base-x";
+};