1*8d13bc63SEmmanuel Vadot// SPDX-License-Identifier: (GPL-2.0+ OR MIT) 2*8d13bc63SEmmanuel Vadot/* 3*8d13bc63SEmmanuel Vadot * Copyright (C) 2023 Marvell International Ltd. 4*8d13bc63SEmmanuel Vadot * 5*8d13bc63SEmmanuel Vadot * Device tree for the AC5X RD Type 7 Com Express carrier board, 6*8d13bc63SEmmanuel Vadot * Utilizing the CN913x COM Express CPU module board. 7*8d13bc63SEmmanuel Vadot * This specific carrier board in this mode of operation (external) 8*8d13bc63SEmmanuel Vadot * only maintains a PCIe link with the CPU module, 9*8d13bc63SEmmanuel Vadot * which does not require any special DTS definitions. 10*8d13bc63SEmmanuel Vadot * 11*8d13bc63SEmmanuel Vadot * AC5X RD works here in external mode (switch selectable at the back of the 12*8d13bc63SEmmanuel Vadot * board), and connect via an external cable a kit 13*8d13bc63SEmmanuel Vadot * which would allow it to use an external CN9131 CPU COM Express module, 14*8d13bc63SEmmanuel Vadot * mounted on top of an interposer kit. 15*8d13bc63SEmmanuel Vadot * 16*8d13bc63SEmmanuel Vadot * So in this case, once the switch is set to external mode as explained above, 17*8d13bc63SEmmanuel Vadot * the AC5X RD becomes part of the carrier solution. 18*8d13bc63SEmmanuel Vadot * 19*8d13bc63SEmmanuel Vadot * When the board boots in the external CPU mode, the internal CPU is disabled, 20*8d13bc63SEmmanuel Vadot * and only the switch portion of the SOC acts as a PCIe end-point, Hence there 21*8d13bc63SEmmanuel Vadot * is no need to describe this internal (disabled CPU) in the device tree. 22*8d13bc63SEmmanuel Vadot * 23*8d13bc63SEmmanuel Vadot * There is no CPU booting in this mode on the carrier, only on the 24*8d13bc63SEmmanuel Vadot * CN9131 COM Express CPU module. 25*8d13bc63SEmmanuel Vadot * What runs the Linux is the CN9131 on the COM Express CPU module, 26*8d13bc63SEmmanuel Vadot * And it accesses the switch end-point on the AC5X RD portion of the carrier 27*8d13bc63SEmmanuel Vadot * via PCIe. 28*8d13bc63SEmmanuel Vadot */ 29*8d13bc63SEmmanuel Vadot 30*8d13bc63SEmmanuel Vadot#include "cn9131-db-comexpress.dtsi" 31*8d13bc63SEmmanuel Vadot#include "ac5x-rd-carrier.dtsi" 32*8d13bc63SEmmanuel Vadot 33*8d13bc63SEmmanuel Vadot/ { 34*8d13bc63SEmmanuel Vadot model = "Marvell Armada AC5X RD COM EXPRESS type 7 carrier board with CN9131 CPU module"; 35*8d13bc63SEmmanuel Vadot compatible = "marvell,cn9131-ac5x-carrier", "marvell,rd-ac5x-carrier", 36*8d13bc63SEmmanuel Vadot "marvell,cn9131-cpu-module", "marvell,cn9131", 37*8d13bc63SEmmanuel Vadot "marvell,armada-ap807-quad", "marvell,armada-ap807"; 38*8d13bc63SEmmanuel Vadot 39*8d13bc63SEmmanuel Vadot memory@0 { 40*8d13bc63SEmmanuel Vadot device_type = "memory"; 41*8d13bc63SEmmanuel Vadot reg = <0x0 0x0 0x2 0x00000000>; 42*8d13bc63SEmmanuel Vadot }; 43*8d13bc63SEmmanuel Vadot 44*8d13bc63SEmmanuel Vadot}; 45