From nobody Sun Feb 8 19:38:14 2026 Received: from smtpout-02.galae.net (smtpout-02.galae.net [185.246.84.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 86D6737AA79; Fri, 23 Jan 2026 09:55:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.246.84.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769162119; cv=none; b=A3WsyKRQU+Ak85VG58eP8JAGtTelgGjUdOsw7l6t+xpFZZ85eBVrnIhhj7xUHe/9qzpPcbwoyw4/M/WfrAUpbJ1P050+77D9gH1nTF8za+NYf/NHY0Dmiu7cJGap9f/+yGCFMhv7UCy9dcfv9zBiPcn4a46qYvfgtXUgOEr8j68= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769162119; c=relaxed/simple; bh=9gen2o3Mf1ofcL8PeP3W13nzaTJLPOD8lNgOmfF5pKk=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=FVduVVYMwiNd3REiqPGykmmMk9s/KVgq12EKdL9UibmeVqv6SPGfuzJdr1tVhWnJNaz4ra+A5ZBowIZuLYWgHv+2/tFU4Nwu3+nkDc49E+BarGrUNy5IzAoar4gKGnRnrOLdTQbXBwgXCkt4bm2C6ENFHmpuqCacvE1FRE+9Csc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=WkdePuTQ; arc=none smtp.client-ip=185.246.84.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="WkdePuTQ" Received: from smtpout-01.galae.net (smtpout-01.galae.net [212.83.139.233]) by smtpout-02.galae.net (Postfix) with ESMTPS id A0D251A2B1B; Fri, 23 Jan 2026 09:55:00 +0000 (UTC) Received: from mail.galae.net (mail.galae.net [212.83.136.155]) by smtpout-01.galae.net (Postfix) with ESMTPS id 776C66070A; Fri, 23 Jan 2026 09:55:00 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id A7F2D119A87AA; Fri, 23 Jan 2026 10:54:57 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1769162099; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=3P9Z/MlQ9eHNxkkoBbhw62O7wkyC3TSbpmPEbIT1/6Y=; b=WkdePuTQaMXgGA6w4/o9P+lzXyYD7Ooxu5csXmMm0RrS/JU8qsA/lW0VDNgAZEfECljXpC 0wDHKlkkyXsYsXOlT7wpMDncHFUuSvB1Dbm8JmBeK+MzueNG9p41fv61p1oX/CTJ2aGOA5 xkclIxeI4vz7sH9lsQBWHAJm1cpAED1HLw4qjBY+We84u5G0U+dpBVSdx4m6CXBDWjYrMy MFmpwKBfCHT2OSp++2TfnGxvW29tT8zH7riK3e/zrgCGh+G162RhuEtEzUXgfF9tSSsFvs bMXY4vTuUnG01/ihlFKxfCLM55wdZw9OKw9vEQqQvF2q9Enp2lTN5oXlv26VKQ== From: "Thomas Perrot (Schneider Electric)" Date: Fri, 23 Jan 2026 10:54:34 +0100 Subject: [PATCH v2 5/5] watchdog: aaeon: Add watchdog driver for SRG-IMX8PL MCU Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260123-dev-b4-aaeon-mcu-driver-v2-5-9f4c00bfb5cb@bootlin.com> References: <20260123-dev-b4-aaeon-mcu-driver-v2-0-9f4c00bfb5cb@bootlin.com> In-Reply-To: <20260123-dev-b4-aaeon-mcu-driver-v2-0-9f4c00bfb5cb@bootlin.com> 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 , "Thomas Perrot (Schneider Electric)" X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=6057; i=thomas.perrot@bootlin.com; h=from:subject:message-id; bh=9gen2o3Mf1ofcL8PeP3W13nzaTJLPOD8lNgOmfF5pKk=; b=owEB7QES/pANAwAKAZ/ACwVx/grtAcsmYgBpc0VjCnolrcgZBx+MyoNbC5ykndiwIhREZSrhv O34cW1DXOKJAbMEAAEKAB0WIQSHQHfGpqMKIwOoEiGfwAsFcf4K7QUCaXNFYwAKCRCfwAsFcf4K 7Xt/DACpvfqouTjGTqE2wtWT8OcMjIwNq+L4tI9BGl05Bx4O3zZwTlIpq3J8clXpN3OKeTwz5E+ H8hPEj1kAun1kZj5iwzZeRM8kRgvPCVNolTzlTsQ543ywyiWorxRyZ1LFXrb8fZrU6pQUqbNDJ/ +vKjgyYVVDiEGnrYJ6bkCvYPBAjkHnMSHZy91e9qe19IUJTGORBHxjpMleUL3JNnIqWNK+5Sx0/ s9RyVLoFO0XDjqy6CZCWz1bOaC7kLtMhKuXEUGdDybemDSREYgD63WNLQ8iBk/6MOuSKWF2eDCV TiTzxOHhQHpfX0Pyh1+QThdV0IK9RqhAmxbYeKlmiBmK0WH5DKBRG9HQMWl3AQNOPPR/GlQ/DuM 5pSSBuRbt5sEBu2yNADw1MvF2G29dVUZiIJuW8tK1jaUdf8noxX70i9tXFY5RF/gY3m30Qt9ecb ltqBmVhb4FZAse8NKrZ8TfTIPjTek9qbBd/CEm/jBc5tOg1RrSqiTGES+Q/N6ObuizbZ4= X-Developer-Key: i=thomas.perrot@bootlin.com; a=openpgp; fpr=874077C6A6A30A2303A812219FC00B0571FE0AED X-Last-TLS-Session-Version: TLSv1.3 Add watchdog driver for the Aaeon SRG-IMX8PL embedded controller. This driver provides system monitoring and recovery capabilities through the MCU's watchdog timer. The watchdog supports start, stop, and ping operations with a maximum hardware heartbeat of 25 seconds and a default timeout of 240 seconds. The driver assumes the watchdog is already running at probe time, as the MCU typically enables it by default. Co-developed-by: J=C3=A9r=C3=A9mie Dautheribes (Schneider Electric) Signed-off-by: J=C3=A9r=C3=A9mie Dautheribes (Schneider Electric) Signed-off-by: Thomas Perrot (Schneider Electric) --- MAINTAINERS | 1 + drivers/watchdog/Kconfig | 10 ++++ drivers/watchdog/Makefile | 1 + drivers/watchdog/aaeon_mcu_wdt.c | 110 +++++++++++++++++++++++++++++++++++= ++++ 4 files changed, 122 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 28dd964cdf69bdcaec3eb82d6df851a2bad47415..66cc4a5dcbe0977e6baee6d3b5e= 6023dcc06847b 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -193,6 +193,7 @@ S: Maintained F: Documentation/devicetree/bindings/mfd/aaeon,srg-imx8pl-mcu.yaml F: drivers/gpio/gpio-aaeon-mcu.c F: drivers/mfd/aaeon-mcu.c +F: drivers/watchdog/aaeon_mcu_wdt.c F: include/linux/mfd/aaeon-mcu.h =20 AAEON UPBOARD FPGA MFD DRIVER diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index d3b9df7d466b0b7215ee87b3040811d44ee53d2a..1bd4a7bee303e5e2508f540dc2c= 16e9e19ed18b0 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -168,6 +168,16 @@ config SOFT_WATCHDOG_PRETIMEOUT watchdog. Be aware that governors might affect the watchdog because it is purely software, e.g. the panic governor will stall it! =20 +config AAEON_MCU_WATCHDOG + tristate "Aaeon MCU Watchdog" + depends on MFD_AAEON_MCU + select WATCHDOG_CORE + help + Select this option to enable watchdog timer support for the Aaeon + SRG-IMX8PL onboard microcontroller (MCU). This driver provides + watchdog functionality through the MCU, allowing system monitoring + and automatic recovery from system hangs. + config BD957XMUF_WATCHDOG tristate "ROHM BD9576MUF and BD9573MUF PMIC Watchdog" depends on MFD_ROHM_BD957XMUF diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index ba52099b125398a32f80dad23317e223cc4af028..2deec425d3eafb6b208e061fda9= f216f4baa8ecc 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -37,6 +37,7 @@ obj-$(CONFIG_USBPCWATCHDOG) +=3D pcwd_usb.o # ALPHA Architecture =20 # ARM Architecture +obj-$(CONFIG_AAEON_MCU_WATCHDOG) +=3D aaeon_mcu_wdt.o obj-$(CONFIG_ARM_SP805_WATCHDOG) +=3D sp805_wdt.o obj-$(CONFIG_ARM_SBSA_WATCHDOG) +=3D sbsa_gwdt.o obj-$(CONFIG_ARMADA_37XX_WATCHDOG) +=3D armada_37xx_wdt.o diff --git a/drivers/watchdog/aaeon_mcu_wdt.c b/drivers/watchdog/aaeon_mcu_= wdt.c new file mode 100644 index 0000000000000000000000000000000000000000..99be3ce327f44063fce6ba77a7d= 4efcba34361df --- /dev/null +++ b/drivers/watchdog/aaeon_mcu_wdt.c @@ -0,0 +1,110 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Aaeon MCU Watchdog driver + * + * Copyright (C) 2025 Bootlin + * Author: J=C3=A9r=C3=A9mie Dautheribes + * Author: Thomas Perrot + */ + +#include +#include +#include +#include + +#define AAEON_MCU_CONTROL_WDT 0x63 +#define AAEON_MCU_PING_WDT 0x73 + +#define AAEON_MCU_WDT_TIMEOUT 240 +#define AAEON_MCU_WDT_HEARTBEAT_MS 25000 + +struct aaeon_mcu_wdt { + struct watchdog_device wdt; + struct device *dev; +}; + +static int aaeon_mcu_wdt_cmd(struct device *dev, u8 opcode, u8 arg) +{ + u8 cmd[3] =3D { opcode, arg, 0x00 }; + u8 rsp; + + return aaeon_mcu_i2c_xfer(dev, cmd, sizeof(cmd), &rsp, sizeof(rsp)); +} + +static int aaeon_mcu_wdt_start(struct watchdog_device *wdt) +{ + struct aaeon_mcu_wdt *data =3D watchdog_get_drvdata(wdt); + + return aaeon_mcu_wdt_cmd(data->dev, AAEON_MCU_CONTROL_WDT, 0x01); +} + +static int aaeon_mcu_wdt_stop(struct watchdog_device *wdt) +{ + struct aaeon_mcu_wdt *data =3D watchdog_get_drvdata(wdt); + + return aaeon_mcu_wdt_cmd(data->dev, AAEON_MCU_CONTROL_WDT, 0x00); +} + +static int aaeon_mcu_wdt_ping(struct watchdog_device *wdt) +{ + struct aaeon_mcu_wdt *data =3D watchdog_get_drvdata(wdt); + + return aaeon_mcu_wdt_cmd(data->dev, AAEON_MCU_PING_WDT, 0x00); +} + +static const struct watchdog_info aaeon_mcu_wdt_info =3D { + .identity =3D "Aaeon MCU Watchdog", + .options =3D WDIOF_KEEPALIVEPING +}; + +static const struct watchdog_ops aaeon_mcu_wdt_ops =3D { + .owner =3D THIS_MODULE, + .start =3D aaeon_mcu_wdt_start, + .stop =3D aaeon_mcu_wdt_stop, + .ping =3D aaeon_mcu_wdt_ping, +}; + +static int aaeon_mcu_wdt_probe(struct platform_device *pdev) +{ + struct device *dev =3D &pdev->dev; + struct watchdog_device *wdt; + struct aaeon_mcu_wdt *data; + int ret; + + data =3D devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->dev =3D dev->parent; + + wdt =3D &data->wdt; + wdt->parent =3D dev; + wdt->info =3D &aaeon_mcu_wdt_info; + wdt->ops =3D &aaeon_mcu_wdt_ops; + wdt->timeout =3D AAEON_MCU_WDT_TIMEOUT; + wdt->max_hw_heartbeat_ms =3D AAEON_MCU_WDT_HEARTBEAT_MS; + + watchdog_set_drvdata(wdt, data); + platform_set_drvdata(pdev, data); + + ret =3D aaeon_mcu_wdt_start(wdt); + if (ret) + return ret; + + set_bit(WDOG_HW_RUNNING, &wdt->status); + + return devm_watchdog_register_device(dev, wdt); +} + +static struct platform_driver aaeon_mcu_wdt_driver =3D { + .driver =3D { + .name =3D "aaeon-mcu-wdt", + }, + .probe =3D aaeon_mcu_wdt_probe, +}; + +module_platform_driver(aaeon_mcu_wdt_driver); + +MODULE_DESCRIPTION("Aaeon MCU Watchdog Driver"); +MODULE_AUTHOR("J=C3=A9r=C3=A9mie Dautheribes "); +MODULE_LICENSE("GPL"); --=20 2.52.0