arm64: dts: rockchip: Add Turing RK1 SoM support

The Turing RK1 is an upcoming RK3588-based SoM from Turing Machines,
designed on the Jetson SO-DIMM form factor and meant to be compatible
with most Jetson carrier boards (but especially the Turing Pi 2 cluster
board from the same vendor). It has the typical I/O you'd expect from
a Jetson board, including:

- Two UARTs (UART9 for console, UART2 is auxiliary)
- PCI Express (2.0 x1 + 3.0 x4)
- Gigabit Ethernet
- On-board eMMC
- PWM fan w/ tach
- USB-OTG [1]
- HDMI and MIPI DSI [1]
- Miscellaneous external GPIO, I²C, SPI lines [1]

Beyond that, it is pretty similar to the RK3588 EVB (in terms of PMICs,
RTC, etc).

While this is absolutely a SoM, it is a little bit special in that it's
marketed directly to users as a compute node, while most SoMs are
intended to be a part/module incorporated into a larger system. Because
of this, a majority of the users will be treating the RK1 less like a
SoM and more like a miniature "blade server."

This patch introduces a dtsi to enable most[1] of the SoM I/O, as well
as a dts catered more directly to the "compute node" use case.

[1] These peripherals are not addressed with this patch.
Signed-off-by: Sam Edwards <CFSworks@gmail.com>
Link: https://lore.kernel.org/r/20231011225823.2542262-4-CFSworks@gmail.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/Makefile

@@ -105,6 +105,7 @@ dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-nanopc-t6.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-orangepi-5-plus.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-quartzpro64.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-rock-5b.dtb
+dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-turing-rk1.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588s-indiedroid-nova.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588s-khadas-edge2.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588s-rock-5a.dtb

arch/arm64/boot/dts/rockchip/rk3588-turing-rk1.dts

+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * This device tree covers the common case where the RK1 is used as a
+ * "compute node" system, where the carrier board is functioning more like a
+ * generic backplane (with no non-autoenumerable peripherals of its own) than
+ * like a device that the SoM is meant to enable.
+ *
+ * Copyright (c) 2023 Sam Edwards <CFSworks@gmail.com>
+ */
+
+/dts-v1/;
+#include "rk3588-turing-rk1.dtsi"
+
+/ {
+	model = "Turing Machines RK1";
+	compatible = "turing,rk1", "rockchip,rk3588";
+
+	chosen {
+		stdout-path = "serial9:115200n8";
+	};
+};