1 files changed, 44 insertions, 0 deletions
diff --git a/arch/arm64/boot/dts/marvell/ac5x-rd-carrier-cn9131.dts b/arch/arm64/boot/dts/marvell/ac5x-rd-carrier-cn9131.dts
new file mode 100644
index 000000000000..2a0b07000089
--- /dev/null
+++ b/arch/arm64/boot/dts/marvell/ac5x-rd-carrier-cn9131.dts
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (C) 2023 Marvell International Ltd.
+ *
+ * Device tree for the AC5X RD Type 7 Com Express carrier board,
+ * Utilizing the CN913x COM Express CPU module board.
+ * This specific carrier board in this mode of operation (external)
+ * only maintains a PCIe link with the CPU module,
+ * which does not require any special DTS definitions.
+ *
+ * AC5X RD works here in external mode (switch selectable at the back of the
+ * board), and connect via an external cable a kit
+ * which would allow it to use an external CN9131 CPU COM Express module,
+ * mounted on top of an interposer kit.
+ *
+ * So in this case, once the switch is set to external mode as explained above,
+ * the AC5X RD becomes part of the carrier solution.
+ *
+ * When the board boots in the external CPU mode, the internal CPU is disabled,
+ * and only the switch portion of the SOC acts as a PCIe end-point, Hence there
+ * is no need to describe this internal (disabled CPU) in the device tree.
+ *
+ * There is no CPU booting in this mode on the carrier, only on the
+ * CN9131 COM Express CPU module.
+ * What runs the Linux is the CN9131 on the COM Express CPU module,
+ * And it accesses the switch end-point on the AC5X RD portion of the carrier
+ * via PCIe.
+ */
+
+#include "cn9131-db-comexpress.dtsi"
+#include "ac5x-rd-carrier.dtsi"
+
+/ {
+	model = "Marvell Armada AC5X RD COM EXPRESS type 7 carrier board with CN9131 CPU module";
+	compatible = "marvell,cn9131-ac5x-carrier", "marvell,rd-ac5x-carrier",
+			"marvell,cn9131-cpu-module", "marvell,cn9131",
+			"marvell,armada-ap807-quad", "marvell,armada-ap807";
+
+	memory@0 {
+		device_type = "memory";
+		reg = <0x0 0x0 0x2 0x00000000>;
+	};
+
+};