From nobody Mon Feb 9 16:51:36 2026 Received: from smtpout-03.galae.net (smtpout-03.galae.net [185.246.85.4]) (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 BDC9A3D301F for ; Tue, 3 Feb 2026 16:21:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.246.85.4 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770135709; cv=none; b=qjiiGwr3UCoiepxKz4mTCFmJv2HUC2gvzi2sGy3UxQQ/Q+EOZ8TutMCrcyBpWKGxjTD2QmzKH5FJPqDqXAqbVDlYK/zmJgcIw/iLRfe8LnQF2Ze9DOgfM7WGm/Mv2MWZPe6TNPyV2rq+ZHtRm/qXNQM0pzGsVppBWx+kN3INq7Y= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770135709; c=relaxed/simple; bh=ciUXskn8R5Lt6f2W1d0o1EPgKNRay/wwlX1/saFLydw=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=uFUtA15wUMGKMEe+i3yCdwL6aaIQh6AT7TFw0DOgeP7J5yGJo9d0jNcJGEUjZ2MgYFQc7uvKLE8bOL2CL35BZ06OZlgt3DHuiiohG0sflTkVY7H83vXVvC6/fj2hPcgW8+GxgZhlCGyQkoImq0TTAzUNKpVPj7Er1QLI61Dieq4= 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=hWE/18HK; arc=none smtp.client-ip=185.246.85.4 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="hWE/18HK" Received: from smtpout-01.galae.net (smtpout-01.galae.net [212.83.139.233]) by smtpout-03.galae.net (Postfix) with ESMTPS id 7091B4E423E4; Tue, 3 Feb 2026 16:21:46 +0000 (UTC) Received: from mail.galae.net (mail.galae.net [212.83.136.155]) by smtpout-01.galae.net (Postfix) with ESMTPS id 4390160728; Tue, 3 Feb 2026 16:21:46 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 2DF4A119A88F8; Tue, 3 Feb 2026 17:21:43 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1770135705; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=gG4+3elvRPgFun9olntvBtcAKyiBPrgRGWbDn5PwYUk=; b=hWE/18HK32EXiAxGNUZN1QLOMNQbELMO7HfZzjH6R4k/Qkq1K8+E6T44hrW4wGlMN6n//B Uc6hYKo+Xsj5/fSQbVFJ7DH22TF71Gc5SOmEn0zL+wDhy8/PYxsyXoKchF+UKPN0lAYmDo BtNSYAMQ9+0EcmdG6gWe/gcrcsQIIiM2GHWGcGwCndb+lyCxMflEADf8PizyHgrTjnqVet nJgZIalQYl5yDRxmPkEetXS6FgxAH6f902iSWkI/wz3rI8A9LEK5jiMeKsUMcim798k9dr kl4SSKoRp+QL3a/M11Gp0u0ub/9Mc/tkLRskkB3aABdI7GtM7XfFVaNhy1mczQ== From: "Thomas Perrot (Schneider Electric)" Date: Tue, 03 Feb 2026 17:21:14 +0100 Subject: [PATCH v3 5/5] watchdog: aaeon: Add watchdog driver for SRG-IMX8P 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: <20260203-dev-b4-aaeon-mcu-driver-v3-5-0a19432076ac@bootlin.com> References: <20260203-dev-b4-aaeon-mcu-driver-v3-0-0a19432076ac@bootlin.com> In-Reply-To: <20260203-dev-b4-aaeon-mcu-driver-v3-0-0a19432076ac@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=6831; i=thomas.perrot@bootlin.com; h=from:subject:message-id; bh=ciUXskn8R5Lt6f2W1d0o1EPgKNRay/wwlX1/saFLydw=; b=owEB7QES/pANAwAKAZ/ACwVx/grtAcsmYgBpgiCHvD1AXxjRnqgAt6a87ClpUKqMt5CMlkcZF YQeD6pWal6JAbMEAAEKAB0WIQSHQHfGpqMKIwOoEiGfwAsFcf4K7QUCaYIghwAKCRCfwAsFcf4K 7dRyC/0akOqDxszsPA3jXLLNIaGm3NJK8g0sTE4ntYC7mBAdbOh8QrzkXhpe+lZlHo+Gwuj6ZUW oVbv3+1yfacUMoGDbIdgTN5r39xhS2zS8OgE4GwhBqRYZEf4YEvtlIU12mEVV2k5j1zcL8nU0yW Tgg6b6+9DbtCJGB855wrZD0NRcUoXWgF8wByK8DP3N9G0D8Rlm6FFzpmYg40mtlSocgd9e0X87g MmfEqogUJk3w7j0pfXnGDLq830VtEOVlt0VelAkb5XAkhKTgUNpCvSuyw5aTXa2AV3rIfyahw/s Xi+Jw0aEjyFMmuKL8HTcjUtjTjzp73o2oQrHoUKod03848ZSXt49853Wy4Ex6Q/qsO8jplpv97f peh9XBVY+MF31pIfFNtCcX6HRD52DOqAadrh6vcsEGqLmHjeEBNXBpOksdg4Cu2/VaYJ0NZrCqx KFY3VyWMrEO3Afd/ehEL4t8j5sFurF+0lP8fV1dogG2OdBe/cg1M+yD19yKyHPLdAsWB8= 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-IMX8P 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 | 136 +++++++++++++++++++++++++++++++++++= ++++ 4 files changed, 148 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 2538f8c4bc1482b139e18243a68f0a21b9be3704..7b92af42c9fdc17a69a4e7a2fe5= 0f9e199c8b144 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -193,6 +193,7 @@ S: Maintained F: Documentation/devicetree/bindings/mfd/aaeon,srg-imx8p-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..0835df4c902f059c0d61a6e8d88= 4742dd7d2f741 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 || COMPILE_TEST + select WATCHDOG_CORE + help + Select this option to enable watchdog timer support for the Aaeon + SRG-IMX8P 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..416f3035c3226c3889682102d1d= 2453a9365b5ba --- /dev/null +++ b/drivers/watchdog/aaeon_mcu_wdt.c @@ -0,0 +1,136 @@ +// 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_status(struct watchdog_device *wdt, bool *enabled) +{ + struct aaeon_mcu_wdt *data =3D watchdog_get_drvdata(wdt); + u8 cmd[3], rsp; + int ret; + + cmd[0] =3D AAEON_MCU_CONTROL_WDT; + cmd[1] =3D 0x02; + cmd[2] =3D 0x00; + + ret =3D aaeon_mcu_i2c_xfer(data->dev, cmd, sizeof(cmd), &rsp, sizeof(rsp)= ); + if (ret) + return ret; + + *enabled =3D rsp =3D=3D 0x01; + return 0; +} + +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; + bool enabled; + 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; + /* + * The MCU firmware has a fixed hardware timeout of 25 seconds that + * cannot be changed. The watchdog core will handle automatic pinging + * to support longer timeouts. The default timeout of 240 seconds is + * chosen arbitrarily as a reasonable value; users can adjust it via + * the standard watchdog interface if needed. + */ + wdt->timeout =3D AAEON_MCU_WDT_TIMEOUT; + wdt->max_hw_heartbeat_ms =3D AAEON_MCU_WDT_HEARTBEAT_MS; + + watchdog_set_drvdata(wdt, data); + + ret =3D aaeon_mcu_wdt_status(wdt, &enabled); + if (ret) + return ret; + + if (enabled) + 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