The CM3588 NAS by FriendlyElec pairs the CM3588 compute module, based on
the Rockchip RK3588 SoC, with the CM3588 NAS Kit carrier board.
To reflect the hardware setup, add device tree sources for the SoM and
the NAS daughter board as separate files.

Hardware features:
    - Rockchip RK3588 SoC
    - 4GB/8GB/16GB LPDDR4x RAM
    - 64GB eMMC
    - MicroSD card slot
    - 1x RTL8125B 2.5G Ethernet
    - 4x M.2 M-Key with PCIe 3.0 x1 (via bifurcation) for NVMe SSDs
    - 2x USB 3.0 (USB 3.1 Gen1) Type-A, 1x USB 2.0 Type-A
    - 1x USB 3.0 Type-C with DP AltMode support
    - 2x HDMI 2.1 out, 1x HDMI in
    - MIPI-CSI Connector, MIPI-DSI Connector
    - 40-pin GPIO header
    - 4 buttons: power, reset, recovery, MASK, user button
    - 3.5mm Headphone out, 2.0mm PH-2A Mic in
    - 5V Fan connector, PWM beeper, IR receiver, RTC battery connector

PCIe bifurcation is used to handle all four M.2 sockets at PCIe 3.0 x1
speed. Data lane mapping in the DT is done like described in commit
f8020dfb ("phy: rockchip-snps-pcie3: fix bifurcation on rk3588").

This device tree includes support for eMMC, SD card, ethernet, all USB2
and USB3 ports, all four M.2 slots, GPU, beeper, IR, RTC, UART debugging
as well as the buttons and LEDs.
The GPIOs are labeled according to the schematics.
Reviewed-by: Space Meyer <git@the-space.agency>
Signed-off-by: Sebastian Kropatsch <seb-dev@mail.de>
Link: https://lore.kernel.org/r/20240616215354.40999-3-seb-dev@mail.deSigned-off-by: Heiko Stuebner <heiko@sntech.de>