[PATCH v4 0/3] riscv: dts: sophgo: Add Milk-V Duo 256M board support

The Milk-V Duo 256M is a small form factor development board based on
the Sophgo SG2002 SoC.

This series adds the board binding, the PWR_GPIO controller node for
the CV180x/CV181x family, and the board device tree with support for
the UART console, SD/MMC, USB host and the onboard blue status LED.

Tested on actual Milk-V Duo 256M hardware: verified boot to shell,
SD card rootfs mount, USB host (root hub detected) and the heartbeat
LED, both via the default heartbeat trigger and manual sysfs control.

Changes since v3:
- Move the pwr_gpio node in cv180x.dtsi to follow unit-address ordering,
  placing it between usb@4340000 and rtc@5025000 (Inochi Amaoto)

Changes since v2:
- Add the PWR_GPIO (porte) controller node to cv180x.dtsi as a new
  patch, instead of dropping the LED node (Inochi Amaoto)
- Restore the gpio-leds node for the onboard blue status LED
- Add my copyright to the new board dts
- Drop the unrelated Makefile trailing-newline change

Changes since v1:
- Removed the leds node because &porte was not supported in cv180x.dtsi
  (reworked in v3)
- Retained the &usb node because it is already defined in cv180x.dtsi

Chen-Yu Yeh (3):
  dt-bindings: soc: sophgo: add Milk-V Duo 256M board
  riscv: dts: sophgo: cv180x: Add PWR_GPIO controller
  riscv: dts: sophgo: Add Milk-V Duo 256M board support

 .../bindings/soc/sophgo/sophgo.yaml           |   4 +
 arch/riscv/boot/dts/sophgo/Makefile           |   1 +
 arch/riscv/boot/dts/sophgo/cv180x.dtsi        |  18 +++
 .../boot/dts/sophgo/sg2002-milkv-duo256m.dts  | 121 ++++++++++++++++++
 4 files changed, 144 insertions(+)
 create mode 100644 arch/riscv/boot/dts/sophgo/sg2002-milkv-duo256m.dts


base-commit: 980ab36ae5972c83f683b939e50c469c4947229e
-- 
2.43.0