[PATCH u-boot v4 0/2] aspeed: Add support for MSX4

[Marc Olberding <molberding@nvidia.com>]

Add a device tree flag for the FMC_WDT2 to be disabled.
Also add a device tree for MSX4 that uses the aforementioned flag.
The MSX4 is a granite rapids based reference hardware platform module
for the CX8 SuperNIC Switchboard. It uses the AST2600 BMC SoC for
out of band management.

Patch 1 adds support for the aspeed_spi.c driver to disable the
FMC_WDT2 via a device tree flag, aspeed,abr-watchdog-disable.

Example usage is as such:
```
&fmc {
        pinctrl-names = "default";
        pinctrl-0 = <&pinctrl_fmcquad_default>;
        aspeed,abr-watchdog-disable;
        status = "okay";

};
```

Patch 2 adds the devicetree for this board.

Reference architecture for the msx4:
https://developer.nvidia.com/blog/nvidia-connectx-8-supernics-advance-ai-platform-architecture-with-pcie-gen6-connectivity/

There was also some discussion of breaking
out espi_init into a seperate function so it can be reused between
different board files. That will be split out into a seperate,
follow-on patch series, since we're no longer creating a new
board file.

Signed-off-by: Marc Olberding <molberding@nvidia.com>
---
Changes in v4:
- Change device tree attirbute to abr-watchdog-disable
- Cleaned up WDT_* references in driver change to FMC_WDT2
- Link to v3: https://lore.kernel.org/r/20251216-msx4-v3-0-14a4b0c3f359@nvidia.com

Changes in v3:
- whitespace fixup in the Makefile changes per Andrew Jeffrey
- cleanup boolean assignment for disabling the fmc wdt2
- cleanup whitespace in changes to spi driver
- keep consistent ordering for status in dts
- Link to v2: https://lore.kernel.org/r/20251202-msx4-v2-0-a605d448bd02@nvidia.com

Changes in v2:
- Switched from using a board file to adding support for disabling FMC_WDT2 to aspeed driver
- Added the new device-tree flag to the MSX4 dts
- Dropped board file for the MSX4
- Link to v1: https://lore.kernel.org/r/20251121-msx4-v1-0-fc0118b666c1@nvidia.com

---
Marc Olberding (2):
      drivers: spi: Add support for disabling FMC_WDT2 for aspeed
      arch: arm: dts: Add dts for the nvidia msx4 board

 arch/arm/dts/Makefile                    |   1 +
 arch/arm/dts/ast2600-msx4-bmc-nvidia.dts | 112 +++++++++++++++++++++++++++++++
 drivers/spi/aspeed_spi.c                 |  18 +++--
 3 files changed, 127 insertions(+), 4 deletions(-)
---
base-commit: 8e15f5c0b1e7b11296ae6c88b686e65d509237d0
change-id: 20251107-msx4-cad1e2e4fa39

Best regards,
-- 
Marc Olberding <molberding@nvidia.com>