linux-kernel - [PATCH v3 0/5] Add support for AAEON SRG-IMX8P MCU

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Message-Id: <20260203-dev-b4-aaeon-mcu-driver-v3-0-0a19432076ac@bootlin.com>
Date: Tue, 03 Feb 2026 17:21:09 +0100
From: "Thomas Perrot (Schneider Electric)" <thomas.perrot@...tlin.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Linus Walleij <linusw@...nel.org>, 
 Bartosz Golaszewski <brgl@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, 
 Jérémie Dautheribes <jeremie.dautheribes@...tlin.com>, 
 Wim Van Sebroeck <wim@...ux-watchdog.org>, 
 Guenter Roeck <linux@...ck-us.net>, Lee Jones <lee@...nel.org>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-gpio@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, linux-watchdog@...r.kernel.org, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 "Thomas Perrot (Schneider Electric)" <thomas.perrot@...tlin.com>, 
 Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>
Subject: [PATCH v3 0/5] Add support for AAEON SRG-IMX8P MCU

This patch series introduces support for the AAEON SRG-IMX8P embedded
controller (MCU). The MCU is connected via I2C and provides GPIO and
watchdog functionality for the SRG-IMX8P 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) <thomas.perrot@...tlin.com>
---
Changes in v3:
- Renamed SRG-IMX8PL to SRG-IMX8P
- dt-bindings: add gpio-controller properties as required
- mfd: move struct aaeon_mcu_dev from header to .c file (private)
- mfd: use guard(mutex) and devm_mutex_init() for cleanup
- mfd: firmware version log changed to dev_dbg()
- mfd: add select MFD_CORE to Kconfig
- Kconfig: add || COMPILE_TEST to all three drivers
- watchdog: add comments explaining hardware timeout and WDOG_HW_RUNNING
- watchdog: remove unused platform_set_drvdata()
- watchdog: add a function to query the status
- Link to v2: https://lore.kernel.org/r/20260123-dev-b4-aaeon-mcu-driver-v2-0-9f4c00bfb5cb@bootlin.com

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

---
Thomas Perrot (Schneider Electric) (5):
      dt-bindings: vendor-prefixes: Add AAEON vendor prefix
      dt-bindings: mfd: Add AAEON embedded controller
      mfd: aaeon: Add SRG-IMX8P MCU driver
      gpio: aaeon: Add GPIO driver for SRG-IMX8P MCU
      watchdog: aaeon: Add watchdog driver for SRG-IMX8P MCU

 .../bindings/mfd/aaeon,srg-imx8p-mcu.yaml          |  67 ++++++
 .../devicetree/bindings/vendor-prefixes.yaml       |   2 +
 MAINTAINERS                                        |  10 +
 drivers/gpio/Kconfig                               |  10 +
 drivers/gpio/Makefile                              |   1 +
 drivers/gpio/gpio-aaeon-mcu.c                      | 237 +++++++++++++++++++++
 drivers/mfd/Kconfig                                |  10 +
 drivers/mfd/Makefile                               |   2 +
 drivers/mfd/aaeon-mcu.c                            | 137 ++++++++++++
 drivers/watchdog/Kconfig                           |  10 +
 drivers/watchdog/Makefile                          |   1 +
 drivers/watchdog/aaeon_mcu_wdt.c                   | 136 ++++++++++++
 include/linux/mfd/aaeon-mcu.h                      |  20 ++
 13 files changed, 643 insertions(+)
---
base-commit: d358e5254674b70f34c847715ca509e46eb81e6f
change-id: 20251211-dev-b4-aaeon-mcu-driver-e0e89ebf4afb

Best regards,
-- 
Thomas Perrot (Schneider Electric) <thomas.perrot@...tlin.com>