From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C41F7C43602 for ; Tue, 30 Jun 2026 12:51:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To: Content-Transfer-Encoding:Content-Type:MIME-Version:Message-Id:Date:Subject: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=Y4vxuq1hsWIzJHmUQ5gpCbPTMUFi5om9JE3+vStt6zc=; b=Bj4fFiq2A8BexF AQrU/NOqMsC2nBrQA24rCA35wAZ1g7mhK7vV6qaaNMvJVfunMpiprA7XXOpH+CBUE+3Li9lgDNAjk vWhLtZPdUmERbO0PQcT2r+XrTjjDjaKFlVio9CJvegB7RIgskfMtfAEJglKe9zKjjqqx4u9Wza4KT H7dPzuYwXg0AkpR7zWw39Lu63eN4fmFtusN7PEIyTjfB331xRQrp2oCy3o5QXQAHe2a9sZGgi83Ug 2BTjD1vM9xCVy4IPxOjQJ+/SWwT4xkg8XE7Ov+4WHCdljnQqND4OeOwlrkF4QdR/lJ+1A+XfwVCzh 7APPO7R2JydX60Y+MTew==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1weXwA-0000000H2vp-3haV; Tue, 30 Jun 2026 12:51:38 +0000 Received: from smtpout-02.galae.net ([185.246.84.56]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1weXw4-0000000H2rY-09tv for linux-arm-kernel@lists.infradead.org; Tue, 30 Jun 2026 12:51:34 +0000 Received: from smtpout-01.galae.net (smtpout-01.galae.net [212.83.139.233]) by smtpout-02.galae.net (Postfix) with ESMTPS id D02AF1A0D5A; Tue, 30 Jun 2026 12:51:28 +0000 (UTC) Received: from mail.galae.net (mail.galae.net [212.83.136.155]) by smtpout-01.galae.net (Postfix) with ESMTPS id A0D7B6025A; Tue, 30 Jun 2026 12:51:28 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 55F4E106F1E97; Tue, 30 Jun 2026 14:51:21 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1782823887; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding; bh=Y4vxuq1hsWIzJHmUQ5gpCbPTMUFi5om9JE3+vStt6zc=; b=Ol53ycHTwafFTsJ0jZuZC4mvH6xvLp5KPZGNOSnvgIW3KU74ZEuhiYbzABdmSfR1Gd0OU5 mopW01mzA1bKH57thL2n0SKrd3Mh8FxotIuM2vtkYfdvI7lw0pBF1Ung05CtgtqwB1Ej2h Gj/noj0x7EHg4saiIHS5xTsw/LNctdT3wxa0QP1QNYaZPCYLASbgY2PWFXONbYvbxLXZUz Z4sTqnun5JJ53gh/J7fLsvoQDM8U8kQkfk+QuJonrBT4x/Xs0IxAsonSXE4NP2UhzvPDWU srCoI5+/0TIw3+9zxp+pn5lbg/WsjB8/eAhb5l1J3r9DURbEvbchGvXHtGn+xw== From: "Thomas Perrot (Schneider Electric)" Subject: [PATCH v6 0/5] Add support for AAEON SRG-IMX8P MCU Date: Tue, 30 Jun 2026 14:51:10 +0200 Message-Id: <20260630-dev-b4-aaeon-mcu-driver-v6-0-d66b5fcbd2f0@bootlin.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAAAAAAAC/4XQ3UoDMRAF4FcpuTaSyV+zXvke4kUmmdiA3Ui2B qXsu5stSinL1sszMN8Z5swmqpkm9rQ7s0otT7mMPdiHHQsHP74Rz7FnJoU0IAF4pMZRc++pjPw YPnmsuVHlJMgNhEn7hKxvf1RK+esiv7z2fMjTqdTvS1GDZfq/2YALbgZMHtAHldQzlnJ6z+NjK Mel5FeQ9wWL0RoMjhLIG2G5q8m/W6wAqbYl2aUh6SAEJjQB15K6SlLckVSXhIdBKyn21oe1pK+ Sknpb0l3q/xYAMen9oNeSuUpauG3JLFIcHEbtwFp3K83z/AO2BVRzKgIAAA== 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-Last-TLS-Session-Version: TLSv1.3 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260630_055132_230596_3655751B X-CRM114-Status: GOOD ( 17.07 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 v6: - mfd: rename local variable to ddata in probe - mfd: fix driver name from "aaeon_mcu" to "aaeon-mcu" - mfd: set I2C_M_DMA_SAFE on all i2c_msg flags so the host driver skips bounce-buffering the heap-allocated DMA-safe buffers - mfd: drop COMPILE_TEST - gpio: replace __set/__clear/__assign_bit with atomic set_bit/ clear_bit/assign_bit to fix potential races on shared bitmaps - gpio: write output value before switching pin to output mode to avoid a potential glitch on direction_output - gpio: add MODULE_ALIAS("platform:aaeon-mcu-gpio") - watchdog: add WDIOF_SETTIMEOUT and watchdog_init_timeout() so the software timeout is configurable via ioctl, DT timeout-sec or the watchdog_timeout boot parameter - watchdog: add watchdog_stop_on_reboot() to prevent a spurious reset from the external MCU during system shutdown - watchdog: add MODULE_ALIAS("platform:aaeon-mcu-wdt") - Link to v5: https://lore.kernel.org/r/20260408-dev-b4-aaeon-mcu-driver-v5-0-ad98bd481668@bootlin.com 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 | 230 +++++++++++++++++++++ drivers/mfd/Kconfig | 11 + drivers/mfd/Makefile | 1 + drivers/mfd/aaeon-mcu.c | 205 ++++++++++++++++++ drivers/watchdog/Kconfig | 10 + drivers/watchdog/Makefile | 1 + drivers/watchdog/aaeon_mcu_wdt.c | 144 +++++++++++++ include/linux/mfd/aaeon-mcu.h | 40 ++++ 13 files changed, 731 insertions(+) --- base-commit: d358e5254674b70f34c847715ca509e46eb81e6f change-id: 20251211-dev-b4-aaeon-mcu-driver-e0e89ebf4afb Best regards, -- Thomas Perrot (Schneider Electric)