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Wed, 8 Apr 2026 19:22:12 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1775668937; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding; bh=+Wz7EWR6PFtBNGIpnKG6zlh6pWOtrnWRejKbkJ7zGIY=; b=vcE6F9Bm0xLbMFqR4xIAs+2HhyfGZTh0nQ6D037ZgVz1u7nNb8yF1TAaZN33ANBEfkW6Ba P2doGxy3nCV/hxau4OL92CQcSNWoTKHWPrx95EhONQO0bTGPAGOkySAnxqsgkRYK1MIwbr IsGUuCY/zZ6uUOJ4cCalg5CBqZLEIwdUqtNPRVclzZ6jzH+IFcoTRNN1b+CfoQHJgfFTiQ oyrNiDChEJB6Yf7pM06krJIQuVxI6V2EEWJdjhCEyomF3Q0Iuy0fVVquwyjlcLvOgnZzS6 8shZsf2HkgPfDlWQPGqdOmQoMAeuLaHgb7P4DykRwvaA3wsQaec9E8kXADexqg== From: "Thomas Perrot (Schneider Electric)" Subject: [PATCH v5 0/5] Add support for AAEON SRG-IMX8P MCU Date: Wed, 08 Apr 2026 19:21:53 +0200 Message-Id: <20260408-dev-b4-aaeon-mcu-driver-v5-0-ad98bd481668@bootlin.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAAAAAAAC/4XQwWoDIRAG4FcJnmtxRt3EnvoeoQdHx0Zo1uKmk hL23euGlhBC0uM/MN8/zElMXDNP4mV1EpVbnnIZe7BPKxF2fnxnmWPPAhVaQAAZuUky0nsuo9y HLxlrblwlK944pmR8ItG3PyunfDzL27eed3k6lPp9LmqwTP83G0glraPkgXzQSb9SKYePPD6Hs l9KfgV8LAwUB0thwwnwSljuavh3y6AA9X0Ju+SSCUpRIhvoVtIXCdUDSXdJeXBGo1oPPtxK5iJ pNPcl06X+bwUQk1k7cy3N8/wDZHlEAuABAAA= X-Change-ID: 20251211-dev-b4-aaeon-mcu-driver-e0e89ebf4afb To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Linus Walleij , Bartosz Golaszewski , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , =?utf-8?q?J=C3=A9r=C3=A9mie_Dautheribes?= , Wim Van Sebroeck , Guenter Roeck , Lee Jones Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-watchdog@vger.kernel.org, Thomas Petazzoni , Miquel Raynal , "Thomas Perrot (Schneider Electric)" , Krzysztof Kozlowski , Conor Dooley , Bartosz Golaszewski X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=4278; i=thomas.perrot@bootlin.com; h=from:subject:message-id; bh=ays/7jNwW83CF93SHZVFHVvuLfD/wIAAwD4jrcSavkE=; b=owEB7QES/pANAwAKAZ/ACwVx/grtAcsmYgBp1o7Dcs3pGUCJVgH0wv4fifMTQ43eT7+gmyEq0 GBStzGjCJiJAbMEAAEKAB0WIQSHQHfGpqMKIwOoEiGfwAsFcf4K7QUCadaOwwAKCRCfwAsFcf4K 7X3/DACUMsrlamPpXwrcTDRZAlqDJTA3mvxlKDttCd4kyVBnt2mOkeicVC7GHSaC18Ng3kSmDe8 Gzlcv6JPWdLit91T/pO4cs5+8wUWpeZTA+6bTEfxHYCUFfUZsKO7cnvKoV45hE7wxRcYkJbshk4 cehXRpVYtj+RzWEN7UwucBpvxAoJmhTD9lntAugndNIqM+hPPvD2IORRdUDNuE4Y/Xq9V+sjK2r uP157fvYGxkOPsRtd4iQuFo6/aJiFSvPrSf9FErodYvOO6nXMTAT/hN6rbbubtItFhKU8Qx2OA1 yHMTUkBNxYfMsEyw5czyyqr6zlxnUpGEICeM2cfUl4x9fHAlTQyFQODqaRRLGsoMe+eqxR4d0wp eI/VOYtboYNZVbhSNkIMd6qiirnwV0QxTAGySTJ6xkDbEx3+0bubDWq5nuF66WuZaZ5HSe2c9zi D1U4J3HHA21BopSPjfATaQiFahDUPmx/VWOU8YHgQI27ZOsFm0U3QozGc2s4u+8UPLJZY= X-Developer-Key: i=thomas.perrot@bootlin.com; a=openpgp; fpr=874077C6A6A30A2303A812219FC00B0571FE0AED X-Last-TLS-Session-Version: TLSv1.3 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) --- Changes in v5: - mfd: use heap-allocated DMA-safe buffers for I2C transfers, replacing stack-allocated buffers in the regmap bus callbacks - mfd: switch from REGCACHE_NONE to REGCACHE_MAPLE; add volatile_reg callback marking GPIO input read registers (opcode 0x72) as volatile; add max_register - mfd: use PLATFORM_DEVID_AUTO instead of PLATFORM_DEVID_NONE - mfd: use MFD_CELL_BASIC() macro for cell definitions - mfd: use dev_err_probe() for regmap initialization error - Link to v4: https://lore.kernel.org/r/20260324-dev-b4-aaeon-mcu-driver-v4-0-afb011df4794@bootlin.com Changes in v4: - mfd: switch to a custom regmap bus; remove aaeon_mcu_i2c_xfer() and the aaeon_mcu_dev struct - mfd: locking delegated to regmap's built-in mutex; drop explicit mutex - mfd: remove firmware version reading at probe time - gpio, watchdog: use regmap_read()/regmap_write() via dev_get_regmap() - include: replace aaeon_mcu_i2c_xfer() declaration with AAEON_MCU_REG() macro - dt-bindings: remove unused label from example node - Link to v3: https://lore.kernel.org/r/20260203-dev-b4-aaeon-mcu-driver-v3-0-0a19432076ac@bootlin.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 | 9 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-aaeon-mcu.c | 229 +++++++++++++++++++++ drivers/mfd/Kconfig | 10 + drivers/mfd/Makefile | 1 + drivers/mfd/aaeon-mcu.c | 204 ++++++++++++++++++ drivers/watchdog/Kconfig | 10 + drivers/watchdog/Makefile | 1 + drivers/watchdog/aaeon_mcu_wdt.c | 132 ++++++++++++ include/linux/mfd/aaeon-mcu.h | 40 ++++ 13 files changed, 716 insertions(+) --- base-commit: d358e5254674b70f34c847715ca509e46eb81e6f change-id: 20251211-dev-b4-aaeon-mcu-driver-e0e89ebf4afb Best regards, -- Thomas Perrot (Schneider Electric)