Implemented basic SPI support for SG2042 SoC[1] using 
the upstreamed Synopsys DW-SPI IP.

This is tested on milkv-pioneer board on bus level. Using 
driver/spi/spidev.c for creating virtual /dev/spidevX.Y and 
tools/spi/spidev_test for testing functionality.

Signed-off-by: Zixian Zeng <sycamoremoon376@gmail.com>
---
Changes in v4:
- Adjust the order of spi nodes
- Place the binding after Renesas
- Fix the description issues of patches
- Link to v3: https://lore.kernel.org/r/20250313-sfg-spi-v3-0-e686427314b2@gmail.com

Changes in v3:
- Remove the spi status on sg2042-milkv-pioneer board
- Remove remove clock GATE_CLK_SYSDMA_AXI from spi[2]
- Create dt-binding of compatible property
- Replace the general compatible property with SoC-specific in dts
- Link to v2: https://lore.kernel.org/r/20250228-sfg-spi-v2-1-8bbf23b85d0e@gmail.com

Changes in v2:
- Rebase v1 to sophgo/master(github.com/sophgo/linux.git).
- Order properties in device node.
- Remove unevaluated properties `clock-frequency`.
- Set default status to disable.
- Link to v1: https://lore.kernel.org/r/20250228-sfg-spi-v1-1-b989aed94911@gmail.com

[1] https://github.com/sophgo/sophgo-doc/blob/main/SG2042/TRM/source/SPI.rst
[2] https://github.com/sophgo/sophgo-doc/blob/main/SG2042/TRM/source/clock.rst#clock-tree

---
Zixian Zeng (2):
      spi: dt-bindings: snps,dw-apb-ssi: Add compatible for SOPHGO SG2042 SoC
      riscv: sophgo: dts: Add spi controller for SG2042

 .../devicetree/bindings/spi/snps,dw-apb-ssi.yaml   |  4 ++++
 arch/riscv/boot/dts/sophgo/sg2042.dtsi             | 26 ++++++++++++++++++++++
 2 files changed, 30 insertions(+)
---
base-commit: 0af2f6be1b4281385b618cb86ad946eded089ac8
change-id: 20250228-sfg-spi-e3f2aeca09ab

Best regards,
-- 
Zixian Zeng <sycamoremoon376@gmail.com>

On Mon, 07 Apr 2025 14:35:11 +0800, Zixian Zeng wrote:
> Implemented basic SPI support for SG2042 SoC[1] using
> the upstreamed Synopsys DW-SPI IP.
> 
> This is tested on milkv-pioneer board on bus level. Using
> driver/spi/spidev.c for creating virtual /dev/spidevX.Y and
> tools/spi/spidev_test for testing functionality.
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next

Thanks!

[1/2] spi: dt-bindings: snps,dw-apb-ssi: Add compatible for SOPHGO SG2042 SoC
      commit: 0889c4d28ad79b55ee8cf3c818e9d86203ace8f0

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark