[{"id":3675957,"web_url":"http://patchwork.ozlabs.org/comment/3675957/","msgid":"","list_archive_url":null,"date":"2026-04-10T15:49:07","subject":"Re: [PATCH v5 5/5] watchdog: aaeon: Add watchdog driver for SRG-IMX8P\n MCU","submitter":{"id":21889,"url":"http://patchwork.ozlabs.org/api/people/21889/","name":"Guenter Roeck","email":"linux@roeck-us.net"},"content":"On 4/8/26 10:21, Thomas Perrot (Schneider Electric) wrote:\n> Add watchdog driver for the Aaeon SRG-IMX8P embedded controller.\n> This driver provides system monitoring and recovery capabilities\n> through the MCU's watchdog timer.\n> \n> The watchdog supports start, stop, and ping operations with a maximum\n> hardware heartbeat of 25 seconds and a default timeout of 240 seconds.\n> \n> Co-developed-by: Jérémie Dautheribes (Schneider Electric) \n> Signed-off-by: Jérémie Dautheribes (Schneider Electric) \n> Signed-off-by: Thomas Perrot (Schneider Electric) \n> ---\n> MAINTAINERS | 1 +\n> drivers/watchdog/Kconfig | 10 +++\n> drivers/watchdog/Makefile | 1 +\n> drivers/watchdog/aaeon_mcu_wdt.c | 132 +++++++++++++++++++++++++++++++++++++++\n> 4 files changed, 144 insertions(+)\n> \n> diff --git a/MAINTAINERS b/MAINTAINERS\n> index 2538f8c4bc14..7b92af42c9fd 100644\n> --- a/MAINTAINERS\n> +++ b/MAINTAINERS\n> @@ -193,6 +193,7 @@ S:\tMaintained\n> F:\tDocumentation/devicetree/bindings/mfd/aaeon,srg-imx8p-mcu.yaml\n> F:\tdrivers/gpio/gpio-aaeon-mcu.c\n> F:\tdrivers/mfd/aaeon-mcu.c\n> +F:\tdrivers/watchdog/aaeon_mcu_wdt.c\n> F:\tinclude/linux/mfd/aaeon-mcu.h\n> \n> AAEON UPBOARD FPGA MFD DRIVER\n> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig\n> index d3b9df7d466b..f67a0b453316 100644\n> --- a/drivers/watchdog/Kconfig\n> +++ b/drivers/watchdog/Kconfig\n> @@ -420,6 +420,16 @@ config SL28CPLD_WATCHDOG\n> \n> # ARM Architecture\n> \n> +config AAEON_MCU_WATCHDOG\n> +\ttristate \"Aaeon MCU Watchdog\"\n> +\tdepends on MFD_AAEON_MCU\n> +\tselect WATCHDOG_CORE\n> +\thelp\n> +\t Select this option to enable watchdog timer support for the Aaeon\n> +\t SRG-IMX8P onboard microcontroller (MCU). This driver provides\n> +\t watchdog functionality through the MCU, allowing system monitoring\n> +\t and automatic recovery from system hangs.\n> +\n> config AIROHA_WATCHDOG\n> \ttristate \"Airoha EN7581 Watchdog\"\n> \tdepends on ARCH_AIROHA || COMPILE_TEST\n> diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile\n> index ba52099b1253..2deec425d3ea 100644\n> --- a/drivers/watchdog/Makefile\n> +++ b/drivers/watchdog/Makefile\n> @@ -37,6 +37,7 @@ obj-$(CONFIG_USBPCWATCHDOG) += pcwd_usb.o\n> # ALPHA Architecture\n> \n> # ARM Architecture\n> +obj-$(CONFIG_AAEON_MCU_WATCHDOG) += aaeon_mcu_wdt.o\n> obj-$(CONFIG_ARM_SP805_WATCHDOG) += sp805_wdt.o\n> obj-$(CONFIG_ARM_SBSA_WATCHDOG) += sbsa_gwdt.o\n> obj-$(CONFIG_ARMADA_37XX_WATCHDOG) += armada_37xx_wdt.o\n> diff --git a/drivers/watchdog/aaeon_mcu_wdt.c b/drivers/watchdog/aaeon_mcu_wdt.c\n> new file mode 100644\n> index 000000000000..949b506d8194\n> --- /dev/null\n> +++ b/drivers/watchdog/aaeon_mcu_wdt.c\n> @@ -0,0 +1,132 @@\n> +// SPDX-License-Identifier: GPL-2.0-or-later\n> +/*\n> + * Aaeon MCU Watchdog driver\n> + *\n> + * Copyright (C) 2026 Bootlin\n> + * Author: Jérémie Dautheribes \n> + * Author: Thomas Perrot \n> + */\n> +\n> +#include \n> +#include \n> +#include \n> +#include \n> +#include \n> +\n> +#define AAEON_MCU_PING_WDT\t0x73\n> +\n> +#define AAEON_MCU_WDT_TIMEOUT 240\n> +#define AAEON_MCU_WDT_HEARTBEAT_MS 25000\n> +\n> +struct aaeon_mcu_wdt {\n> +\tstruct watchdog_device wdt;\n> +\tstruct regmap *regmap;\n> +};\n> +\n> +static int aaeon_mcu_wdt_cmd(struct aaeon_mcu_wdt *data, u8 opcode, u8 arg)\n> +{\n> +\treturn regmap_write(data->regmap, AAEON_MCU_REG(opcode, arg), 0);\n> +}\n> +\n> +static int aaeon_mcu_wdt_start(struct watchdog_device *wdt)\n> +{\n> +\tstruct aaeon_mcu_wdt *data = watchdog_get_drvdata(wdt);\n> +\n> +\treturn aaeon_mcu_wdt_cmd(data, AAEON_MCU_CONTROL_WDT_OPCODE, 0x01);\n> +}\n> +\n> +static int aaeon_mcu_wdt_status(struct watchdog_device *wdt, bool *enabled)\n> +{\n> +\tstruct aaeon_mcu_wdt *data = watchdog_get_drvdata(wdt);\n> +\tunsigned int rsp;\n> +\tint ret;\n> +\n> +\tret = regmap_read(data->regmap,\n> +\t\t\t AAEON_MCU_REG(AAEON_MCU_CONTROL_WDT_OPCODE, 0x02),\n> +\t\t\t &rsp);\n> +\tif (ret)\n> +\t\treturn ret;\n> +\n> +\t*enabled = rsp == 0x01;\n> +\treturn 0;\n> +}\n> +\n> +static int aaeon_mcu_wdt_stop(struct watchdog_device *wdt)\n> +{\n> +\tstruct aaeon_mcu_wdt *data = watchdog_get_drvdata(wdt);\n> +\n> +\treturn aaeon_mcu_wdt_cmd(data, AAEON_MCU_CONTROL_WDT_OPCODE, 0x00);\n> +}\n> +\n> +static int aaeon_mcu_wdt_ping(struct watchdog_device *wdt)\n> +{\n> +\tstruct aaeon_mcu_wdt *data = watchdog_get_drvdata(wdt);\n> +\n> +\treturn aaeon_mcu_wdt_cmd(data, AAEON_MCU_PING_WDT, 0x00);\n> +}\n> +\n> +static const struct watchdog_info aaeon_mcu_wdt_info = {\n> +\t.identity\t= \"Aaeon MCU Watchdog\",\n> +\t.options\t= WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE\n> +};\n> +\n> +static const struct watchdog_ops aaeon_mcu_wdt_ops = {\n> +\t.owner\t\t= THIS_MODULE,\n> +\t.start\t\t= aaeon_mcu_wdt_start,\n> +\t.stop\t\t= aaeon_mcu_wdt_stop,\n> +\t.ping\t\t= aaeon_mcu_wdt_ping,\n> +};\n> +\n> +static int aaeon_mcu_wdt_probe(struct platform_device *pdev)\n> +{\n> +\tstruct device *dev = &pdev->dev;\n> +\tstruct watchdog_device *wdt;\n> +\tstruct aaeon_mcu_wdt *data;\n> +\tbool enabled;\n> +\tint ret;\n> +\n> +\tdata = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);\n> +\tif (!data)\n> +\t\treturn -ENOMEM;\n> +\n> +\tdata->regmap = dev_get_regmap(dev->parent, NULL);\n> +\tif (!data->regmap)\n> +\t\treturn -ENODEV;\n> +\n> +\twdt = &data->wdt;\n> +\twdt->parent = dev;\n> +\twdt->info = &aaeon_mcu_wdt_info;\n> +\twdt->ops = &aaeon_mcu_wdt_ops;\n> +\t/*\n> +\t * The MCU firmware has a fixed hardware timeout of 25 seconds that\n> +\t * cannot be changed. The watchdog core will handle automatic pinging\n> +\t * to support longer timeouts. The software timeout of 240 seconds is\n> +\t * chosen arbitrarily as a reasonable value and is not user-configurable.\n> +\t */\n\nOdd, unusual, unnecessary, I would argue that most people would consider a fixed\ntimeout of 240s as anything but reasonable, and as the comment says arbitrary.\nSince I am sure that I pointed this out before, you still insist, and I am\ntired of arguing: Your funeral, so\n\nAcked-by: Guenter Roeck \n\nGuenter\n\n> +\twdt->timeout = AAEON_MCU_WDT_TIMEOUT;\n> +\twdt->max_hw_heartbeat_ms = AAEON_MCU_WDT_HEARTBEAT_MS;\n> +\n> +\twatchdog_set_drvdata(wdt, data);\n> +\n> +\tret = aaeon_mcu_wdt_status(wdt, &enabled);\n> +\tif (ret)\n> +\t\treturn ret;\n> +\n> +\tif (enabled)\n> +\t\tset_bit(WDOG_HW_RUNNING, &wdt->status);\n> +\n> +\treturn devm_watchdog_register_device(dev, wdt);\n> +}\n> +\n> +static struct platform_driver aaeon_mcu_wdt_driver = {\n> +\t.driver\t\t= {\n> +\t\t.name\t= \"aaeon-mcu-wdt\",\n> +\t},\n> +\t.probe\t\t= aaeon_mcu_wdt_probe,\n> +};\n> +\n> +module_platform_driver(aaeon_mcu_wdt_driver);\n> +\n> +MODULE_DESCRIPTION(\"Aaeon MCU Watchdog Driver\");\n> +MODULE_AUTHOR(\"Jérémie Dautheribes \");\n> +MODULE_LICENSE(\"GPL\");\n>","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-gpio@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=USDIoOUB;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c04:e001:36c::12fc:5321; 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