From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtpout-04.galae.net (smtpout-04.galae.net [185.171.202.116]) (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 0DA9128FFF6; Fri, 12 Dec 2025 07:41:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.171.202.116 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765525310; cv=none; b=XgqTNRbFtIfWzozjykUa/N13Y3GXh8NdNg/e0XPlIsapLptBga7lpiIpJ3Q1TtS/A5AGvYtWr1ZX+6XXRozPFObttjdfu7MUNEkxR15b5ZXRDeYHDTPpHCt/iQojwZTAQunX1rzyL/IVViBxlNgene9xRYvWiAcdXcm0YChr69c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765525310; c=relaxed/simple; bh=1FO0vDmfLJqQKiHmGAgOSN9nU4jTazUFB/kRKdWuYYk=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Ya1OERI2aC3wai+VyX+6uQtNXrV4QUdRVO80W+gFLZ2N2Q8/Sm3PUdxh3Nt/qBOqfb/YNeG9bCpRTk+GJ/hGOqiMwFV8zvpfps9H1dAkdgRUA0urDv+6ZyEFJIOZuWQL+VRWHoyY413pQFiWQ/w07q6/PQM87D9lKVaHwGDQkCo= 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=qzX9Dgpx; arc=none smtp.client-ip=185.171.202.116 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="qzX9Dgpx" Received: from smtpout-01.galae.net (smtpout-01.galae.net [212.83.139.233]) by smtpout-04.galae.net (Postfix) with ESMTPS id 7F3F0C1935D; Fri, 12 Dec 2025 07:41:21 +0000 (UTC) Received: from mail.galae.net (mail.galae.net [212.83.136.155]) by smtpout-01.galae.net (Postfix) with ESMTPS id 93B6D606DF; Fri, 12 Dec 2025 07:41:45 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id CECE7103C8E00; Fri, 12 Dec 2025 08:41:41 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1765525304; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=+9Em5K0Ir5txl5u3tp5x5rRGq90NhxyTh074LTwA5hs=; b=qzX9Dgpx22AICPdAxi7xRAGfWx3RGKwfQRw9DxzdCqwVzm7sM1EmOHBCvR/kMVPuYLIFLL Ad7cbIPeV3sDJ0HCxrFvs3ksnTqu3SDSVw/sVWNodTkKvj6gVwxT4zpBYDZlngyVkbxBL7 oBrI5nCI8+hChxa6UjfNDQQuuWMifmQdGWlTz1XhbY9ML0j0RV1/RM2RANCXaDi+05z1Ul nZaL43wsDFEqYvJ4/ToZ2S3Jd0oiSxrVpIUCK55QAKRqu3diCrHD298TDqxF894BmIR629 A9bEu3pghkoPewK48qpRuwPeSwRkuZyYFDK+JnwGhZzXH5bOsFzeAghTZ+6eEA== From: "Thomas Perrot (Schneider Electric)" Date: Fri, 12 Dec 2025 08:41:10 +0100 Subject: [PATCH 7/8] watchdog: aaeon: Add watchdog driver for SRG-IMX8PL MCU Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Message-Id: <20251212-dev-b4-aaeon-mcu-driver-v1-7-6bd65bc8ef12@bootlin.com> References: <20251212-dev-b4-aaeon-mcu-driver-v1-0-6bd65bc8ef12@bootlin.com> In-Reply-To: <20251212-dev-b4-aaeon-mcu-driver-v1-0-6bd65bc8ef12@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 Perrot (Schneider Electric)" , Thomas Petazzoni X-Mailer: b4 0.14.2 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: Jérémie Dautheribes (Schneider Electric) Signed-off-by: Jérémie Dautheribes (Schneider Electric) Signed-off-by: Thomas Perrot (Schneider Electric) --- drivers/watchdog/Kconfig | 10 +++ drivers/watchdog/Makefile | 1 + drivers/watchdog/aaeon_mcu_wdt.c | 140 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 151 insertions(+) diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index d3b9df7d466b0b7215ee87b3040811d44ee53d2a..1bd4a7bee303e5e2508f540dc2c16e9e19ed18b0 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! +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..2deec425d3eafb6b208e061fda9f216f4baa8ecc 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -37,6 +37,7 @@ obj-$(CONFIG_USBPCWATCHDOG) += pcwd_usb.o # ALPHA Architecture # ARM Architecture +obj-$(CONFIG_AAEON_MCU_WATCHDOG) += aaeon_mcu_wdt.o obj-$(CONFIG_ARM_SP805_WATCHDOG) += sp805_wdt.o obj-$(CONFIG_ARM_SBSA_WATCHDOG) += sbsa_gwdt.o obj-$(CONFIG_ARMADA_37XX_WATCHDOG) += 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..8413ea3bce99585d989cf13e4494e8daff2d9e4c --- /dev/null +++ b/drivers/watchdog/aaeon_mcu_wdt.c @@ -0,0 +1,140 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Aaeon MCU Watchdog driver + * + * Copyright (C) 2025 Bootlin + * Author: Jérémie Dautheribes + * Author: Thomas Perrot + */ + +#include +#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 aaeon_mcu_dev *mfd; +}; + +static int aaeon_mcu_wdt_start_cmd(struct aaeon_mcu_wdt *data) +{ + u8 cmd[3], rsp; + + cmd[0] = AAEON_MCU_CONTROL_WDT; + cmd[1] = 0x01; + cmd[2] = 0x00; + + return aaeon_mcu_i2c_xfer(data->mfd->i2c_client, cmd, 3, &rsp, 1); +} + +static int aaeon_mcu_wdt_start(struct watchdog_device *wdt) +{ + struct aaeon_mcu_wdt *data = watchdog_get_drvdata(wdt); + + return aaeon_mcu_wdt_start_cmd(data); +} + +static int aaeon_mcu_wdt_stop_cmd(struct aaeon_mcu_wdt *data) +{ + u8 cmd[3], rsp; + + cmd[0] = AAEON_MCU_CONTROL_WDT; + cmd[1] = 0x00; + cmd[2] = 0x00; + + return aaeon_mcu_i2c_xfer(data->mfd->i2c_client, cmd, 3, &rsp, 1); +} + +static int aaeon_mcu_wdt_stop(struct watchdog_device *wdt) +{ + struct aaeon_mcu_wdt *data = watchdog_get_drvdata(wdt); + + return aaeon_mcu_wdt_stop_cmd(data); +} + +static int aaeon_mcu_wdt_ping_cmd(struct aaeon_mcu_wdt *data) +{ + u8 cmd[3], rsp; + + cmd[0] = AAEON_MCU_PING_WDT; + cmd[1] = 0x00; + cmd[2] = 0x00; + + return aaeon_mcu_i2c_xfer(data->mfd->i2c_client, cmd, 3, &rsp, 1); +} + +static int aaeon_mcu_wdt_ping(struct watchdog_device *wdt) +{ + struct aaeon_mcu_wdt *data = watchdog_get_drvdata(wdt); + + return aaeon_mcu_wdt_ping_cmd(data); +} + +static const struct watchdog_info aaeon_mcu_wdt_info = { + .identity = "Aaeon MCU Watchdog", + .options = WDIOF_KEEPALIVEPING +}; + +static const struct watchdog_ops aaeon_mcu_wdt_ops = { + .owner = THIS_MODULE, + .start = aaeon_mcu_wdt_start, + .stop = aaeon_mcu_wdt_stop, + .ping = aaeon_mcu_wdt_ping, +}; + +static int aaeon_mcu_wdt_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct aaeon_mcu_dev *mcu = dev_get_drvdata(dev->parent); + struct watchdog_device *wdt; + struct aaeon_mcu_wdt *data; + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->mfd = mcu; + + wdt = &data->wdt; + wdt->parent = dev; + + wdt->info = &aaeon_mcu_wdt_info; + wdt->ops = &aaeon_mcu_wdt_ops; + wdt->max_hw_heartbeat_ms = AAEON_MCU_WDT_HEARTBEAT_MS; + watchdog_init_timeout(wdt, AAEON_MCU_WDT_TIMEOUT, dev); + + watchdog_set_drvdata(wdt, data); + platform_set_drvdata(pdev, data); + set_bit(WDOG_HW_RUNNING, &wdt->status); + + return devm_watchdog_register_device(dev, wdt); +} + +static const struct of_device_id aaeon_mcu_wdt_of_match[] = { + { .compatible = "aaeon,srg-imx8pl-wdt" }, + {}, +}; + +MODULE_DEVICE_TABLE(of, aaeon_mcu_wdt_of_match); + +static struct platform_driver aaeon_mcu_wdt_driver = { + .driver = { + .name = "aaeon-mcu-wdt", + .of_match_table = aaeon_mcu_wdt_of_match, + }, + .probe = aaeon_mcu_wdt_probe, +}; + +module_platform_driver(aaeon_mcu_wdt_driver); + +MODULE_DESCRIPTION("Aaeon MCU Watchdog Driver"); +MODULE_AUTHOR("Jérémie Dautheribes"); +MODULE_LICENSE("GPL"); -- 2.52.0