[PATCH v4 0/3] mailbox: add Samsung Exynos driver

[Tudor Ambarus]

The samsung exynos mailbox controller has 16 flag bits for hardware
interrupt generation and a shared register for passing mailbox messages.
When the controller is used by the ACPM protocol the shared register is
ignored and the mailbox controller acts as a doorbell. The controller
just raises the interrupt to APM after the ACPM protocol has written
the message to SRAM.

I mark this as v3 because it is a continuation of:
https://lore.kernel.org/linux-arm-kernel/20241017163649.3007062-1-tudor.ambarus@linaro.org/

Changes in v4:
- rename bindings file to be based on compatible: google,gs101-acpm-mbox
- specify doorbell or data mode via '#mbox-cells' dt property. Update
  driver and introduce exynos_mbox_of_xlate() to parse the mode.
- s/samsung/Samsung/, s/exynos/Exynos/
- use writel instead of writel_relaxed
- remove stray of_match_ptr() 

Changes in v3:
- decouple the mailbox controller driver from the ACPM protocol driver
- address Krzysztof's review comments

v2:
https://lore.kernel.org/linux-arm-kernel/20241017163649.3007062-1-tudor.ambarus@linaro.org/

v1:
https://lore.kernel.org/linux-arm-kernel/20241004165301.1979527-1-tudor.ambarus@linaro.org/

Signed-off-by: Tudor Ambarus <tudor.ambarus at linaro.org>
---
Tudor Ambarus (3):
      dt-bindings: mailbox: add google,gs101-mbox bindings
      mailbox: add Samsung Exynos driver
      MAINTAINERS: add entry for Samsung Exynos mailbox driver

 .../bindings/mailbox/google,gs101-mbox.yaml        |  79 +++++++++
 MAINTAINERS                                        |  10 ++
 drivers/mailbox/Kconfig                            |  11 ++
 drivers/mailbox/Makefile                           |   2 +
 drivers/mailbox/exynos-mailbox.c                   | 184 +++++++++++++++++++++
 include/dt-bindings/mailbox/google,gs101.h         |  14 ++
 6 files changed, 300 insertions(+)
---
base-commit: fac04efc5c793dccbd07e2d59af9f90b7fc0dca4
change-id: 20241212-acpm-v4-upstream-mbox-948714004b05

Best regards,
-- 
Tudor Ambarus <tudor.ambarus at linaro.org>