// 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>; }; };