[PATCH v3 0/3] riscv: sophgo: add mailbox support for CV18XX series SoC

[Junhui Liu]

Sophgo CV18XX series SoC has a mailbox module used to pass messages to
asymmetric processors. It has a total of 8 channels, each channel has a
length of 64bit.

Tested on Milk-V Duo with CV1800B SoC, Milk-V Duo256M with SG2002 SoC
and Milk-V Duo S with SG2000 SoC by the mailbox-test client.

---
Changes in v3:
- Update cv18x to CV18XX in commit messages and descriptions.
- Remove the `interrupt-names` property in dt-bindings, dts and driver.
- Move the mailbox node in dts to satisfy the address order.
- Remove `OF` dependency in Kconfig and the driver.
- Add copyright in the driver.
- Reorder the processes in dt-bindings and change the `RECV_CPU` macro
  definition from 2 to 1 in the driver.
- Clean up and improve macro definitions and register access methods in
  the driver.
- Improve the return value handling in the interrupt handler functions.
- Implement the `cv1800_last_tx_done` function.
- Link to v2: https://lore.kernel.org/r/SYBP282MB223825D5903777B937A8A377C4A02@SYBP282MB2238.AUSP282.PROD.OUTLOOK.COM

Changes in v2:
- drop 'recvid' 'sender' in dt-bindings
- fix compatible to 'cv1800-mailbox', and change filenames too
- change #mbox-cell to 2, for <channel tagert_cpu>
- add struct cv1800_mbox_chan_priv and function cv1800_mbox_xlate to extract
  informations in mbox devicetree node of mailbox client
- Link to v1: https://lore.kernel.org/r/SYBP282MB2238DE0DA19C6EF411B2356CC4CE2@SYBP282MB2238.AUSP282.PROD.OUTLOOK.COM

---
Yuntao Dai (3):
      dt-bindings: mailbox: add Sophgo CV18XX series SoC
      riscv: dts: add mailbox for Sophgo CV18XX series SoC
      mailbox: sophgo: add mailbox driver for CV18XX series SoC

 .../bindings/mailbox/sophgo,cv1800b-mailbox.yaml   |  57 ++++++
 arch/riscv/boot/dts/sophgo/cv18xx.dtsi             |   7 +
 drivers/mailbox/Kconfig                            |  10 +
 drivers/mailbox/Makefile                           |   2 +
 drivers/mailbox/cv1800-mailbox.c                   | 218 +++++++++++++++++++++
 5 files changed, 294 insertions(+)
---
base-commit: b4432656b36e5cc1d50a1f2dc15357543add530e
change-id: 20250421-cv18xx-mbox-6282d1e1734c

Best regards,
-- 
Junhui Liu <junhui.liu at pigmoral.tech>