This patch series introduces support for the AAEON SRG-IMX8PL embedded
controller (MCU). The MCU is connected via I2C and provides GPIO and
watchdog functionality for the SRG-IMX8PL board.

The series includes:
- Device tree binding for the MFD driver
- MFD driver that serves as the core driver for the MCU
- GPIO driver implementing the GPIO functionality
- Watchdog driver for system monitoring
- MAINTAINERS entry for the new drivers

The drivers follow the standard Linux kernel subsystem patterns, with
the MFD driver registering the sub-devices (GPIO and watchdog) which
are then handled by their respective subsystem drivers.

Signed-off-by: Thomas Perrot (Schneider Electric) <redacted>
---
Changes in v2:
- Fold GPIO and watchdog bindings into MFD binding
- Drop OF_GPIO dependency in GPIO Kconfig
- Use __set_bit/__clear_bit/__assign_bit instead of atomic variants
- Various driver cleanups and improvements
- Link to v1: https://lore.kernel.org/r/20251212-dev-b4-aaeon-mcu-driver-v1-0-6bd65bc8ef12@bootlin.com (local)

---
Thomas Perrot (Schneider Electric) (5):
      dt-bindings: vendor-prefixes: Add AAEON vendor prefix
      dt-bindings: mfd: Add AAEON embedded controller
      mfd: aaeon: Add SRG-IMX8PL MCU driver
      gpio: aaeon: Add GPIO driver for SRG-IMX8PL MCU
      watchdog: aaeon: Add watchdog driver for SRG-IMX8PL MCU

 .../bindings/mfd/aaeon,srg-imx8pl-mcu.yaml         |  56 +++++
 .../devicetree/bindings/vendor-prefixes.yaml       |   2 +
 MAINTAINERS                                        |  10 +
 drivers/gpio/Kconfig                               |  10 +
 drivers/gpio/Makefile                              |   1 +
 drivers/gpio/gpio-aaeon-mcu.c                      | 238 +++++++++++++++++++++
 drivers/mfd/Kconfig                                |   9 +
 drivers/mfd/Makefile                               |   2 +
 drivers/mfd/aaeon-mcu.c                            | 129 +++++++++++
 drivers/watchdog/Kconfig                           |  10 +
 drivers/watchdog/Makefile                          |   1 +
 drivers/watchdog/aaeon_mcu_wdt.c                   | 110 ++++++++++
 include/linux/mfd/aaeon-mcu.h                      |  31 +++
 13 files changed, 609 insertions(+)
---
base-commit: d358e5254674b70f34c847715ca509e46eb81e6f
change-id: 20251211-dev-b4-aaeon-mcu-driver-e0e89ebf4afb

Best regards,
-- 
Thomas Perrot (Schneider Electric) [off-list ref]