[PATCH v4 0/7] arm64 support for Milk-V Duo Module 01 EVB

[Alexander Sverdlin]

This series adds very basic support for Milk-V Duo Module 01 EVB [1] in
arm64 mode. The SoC (SG2000) is dual-arch, RiscV and ARM64, the latter has
been chosen because the upstream toolchain can be utilized.

Sophgo SG2000 seems to be a continuation of the Cvitek CV18xx series, same
peripherals with an addition of ARM64 core. Therefore it would be
beneficial not to copy-paste the peripherals' device-tree, but rather split
the most suitable riscv DT into ARCH-specific and peripherals parts and
just include the latter on the arm64 side.

This series adds the device-tree for Milk-V Duo Module 01 EVB, which
in turn contains Milk-V Duo Module 01 (separate .dtsi) on it, which has
SG2000 SoC inside (separate .dtsi).

This series has been tested with Sophgo-provided U-Boot binary [2]: it
boots from SD card; pinctrl, serial, GPIO drivers are functional (same
as for RiscV-based CV18xx SoCs).

Partial SoC documentation is available [3].

This series lacks the support of:
- USB
- Audio
- Ethernet
- WiFi
- Bluetooth
- eMMC
- Video
- "reboot" functionality

It would probably make sense that the series will go into ARM SOC tree.

Changelog:
v4:
- minimized patch 1/7 (cleanups dropped)
- cv18xx-cpu-intc.dtsi instead of cv18xx-cpu.dtsi+cv18xx-intc.dtsi in
patch 1/7
v3:
- &cpus node has been moved into cv18xx-cpu.dtsi, &plic and &clint nodes
were moved into cv18xx-intc.dtsi to reduce code duplication;
v2:
- dropped all patches related to the new reboot driver and corresponding DT
and bindings;
- grouped DT-related and config-related patches together;
- added patch moving sophgo.yaml from riscv into soc (to share it with
ARM); added SG2000 SoC and Milk-V Duo Module 01 EVB into it;
- other changes are documented in the corresponding patches;

[1] https://milkv.io/docs/duo/getting-started/duo-module-01
[2] https://github.com/milkv-duo/duo-buildroot-sdk-v2/releases/
[3] https://github.com/sophgo/sophgo-doc/releases/download/sg2000-trm-v1.01/sg2000_trm_en.pdf

Alexander Sverdlin (7):
  riscv: dts: sophgo: cv18xx: Move RiscV-specific part into SoCs' .dtsi
    files
  dt-bindings: soc: sophgo: Move SoCs/boards from riscv into soc, add
    SG2000
  arm64: dts: sophgo: Add initial SG2000 SoC device tree
  arm64: dts: sophgo: Add Duo Module 01
  arm64: dts: sophgo: Add Duo Module 01 Evaluation Board
  arm64: Add SOPHGO SOC family Kconfig support
  arm64: defconfig: Enable rudimentary Sophgo SG2000 support

 .../{riscv => soc/sophgo}/sophgo.yaml         |  7 +-
 arch/arm64/Kconfig.platforms                  |  6 ++
 arch/arm64/boot/dts/Makefile                  |  1 +
 arch/arm64/boot/dts/sophgo/Makefile           |  2 +
 .../sophgo/sg2000-milkv-duo-module-01-evb.dts | 31 +++++++
 .../sophgo/sg2000-milkv-duo-module-01.dtsi    | 85 +++++++++++++++++
 arch/arm64/boot/dts/sophgo/sg2000.dtsi        | 75 +++++++++++++++
 arch/arm64/configs/defconfig                  |  4 +
 arch/riscv/boot/dts/sophgo/cv1800b.dtsi       |  5 +
 arch/riscv/boot/dts/sophgo/cv1812h.dtsi       |  5 +
 arch/riscv/boot/dts/sophgo/cv181x.dtsi        |  2 +-
 .../boot/dts/sophgo/cv18xx-cpu-intc.dtsi      | 54 +++++++++++
 arch/riscv/boot/dts/sophgo/cv18xx.dtsi        | 91 +++++--------------
 arch/riscv/boot/dts/sophgo/sg2002.dtsi        |  5 +
 14 files changed, 303 insertions(+), 70 deletions(-)
 rename Documentation/devicetree/bindings/{riscv => soc/sophgo}/sophgo.yaml (80%)
 create mode 100644 arch/arm64/boot/dts/sophgo/Makefile
 create mode 100644 arch/arm64/boot/dts/sophgo/sg2000-milkv-duo-module-01-evb.dts
 create mode 100644 arch/arm64/boot/dts/sophgo/sg2000-milkv-duo-module-01.dtsi
 create mode 100644 arch/arm64/boot/dts/sophgo/sg2000.dtsi
 create mode 100644 arch/riscv/boot/dts/sophgo/cv18xx-cpu-intc.dtsi

-- 
2.48.1