1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
2 /*
3 * Copyright (C) 2023 Marvell International Ltd.
4 *
5 * Device tree for the AC5X RD Type 7 Com Express carrier board,
6 * This specific board in external mode (see below) only maintains
7 * a PCIe link with the COM Express CPU module, which does not
8 * require any special DTS definitions.
9 *
10 * AC5X RD can either work as you would expect, as a complete standalone
11 * box using the internal CPU, or you can move the switch on the back of
12 * the box to "external" mode, and connect via an external cable a kit
13 * which would allow it to use an external CPU COM Express module,
14 * mounted on top of an interposer kit.
15 *
16 * So in this case, once the switch is set to external mode as explained above,
17 * the AC5X RD becomes part of the carrier solution.
18 * This is a development/reference solution, not a full commercial solution,
19 * hence it was designed with the flexibility to be configured in different
20 * modes of operation.
21 *
22 * When the board boots in the external CPU mode, the internal CPU is disabled,
23 * and only the switch portion of the SOC acts as a PCIe end-point, Hence there
24 * is no need to describe this internal (disabled CPU) in the device tree.
25 *
26 * There is no CPU booting in this mode on the carrier,
27 * only on the COM Express CPU module.
28 */
29
30 / {
31 model = "Marvell Armada AC5X RD COM EXPRESS type 7 carrier board";
32 compatible = "marvell,rd-ac5x-carrier";
33
34 };
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