Re: [PATCH 5/5] watchdog: Remove the MTX-1 watchdog driver

[Guenter Roeck <linux@roeck-us.net>]

On Fri, Oct 16, 2026 at 03:16:17PM -0700, Florian Fainelli wrote:
> MTX-1 now uses the generic GPIO watchdog driver with board properties
> describing its GPIO and heartbeat constraints. Remove the unused custom
> driver and its Kconfig and Makefile entries.
> 
> The watchdog core now supplies the character device, keepalive scheduling,
> timeout handling and close semantics previously implemented by this driver.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

Applied.

Thanks,
Guenter

> ---
>  drivers/watchdog/Kconfig     |   7 -
>  drivers/watchdog/Makefile    |   1 -
>  drivers/watchdog/mtx-1_wdt.c | 245 -----------------------------------
>  3 files changed, 253 deletions(-)
>  delete mode 100644 drivers/watchdog/mtx-1_wdt.c
> 
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index f50709c635e5..c884f86be4e3 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -1865,13 +1865,6 @@ config JZ4740_WDT
>  	help
>  	  Hardware driver for the built-in watchdog timer on Ingenic jz4740 SoCs.
>  
> -config WDT_MTX1
> -	tristate "MTX-1 Hardware Watchdog"
> -	depends on MIPS_MTX1 || (MIPS && COMPILE_TEST)
> -	help
> -	  Hardware driver for the MTX-1 boards. This is a watchdog timer that
> -	  will reboot the machine after a 100 seconds timer expired.
> -
>  config SIBYTE_WDOG
>  	tristate "Sibyte SoC hardware watchdog"
>  	depends on CPU_SB1
> diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> index 9ac406677aba..19cb25f51624 100644
> --- a/drivers/watchdog/Makefile
> +++ b/drivers/watchdog/Makefile
> @@ -172,7 +172,6 @@ obj-$(CONFIG_BCM47XX_WDT) += bcm47xx_wdt.o
>  obj-$(CONFIG_RC32434_WDT) += rc32434_wdt.o
>  obj-$(CONFIG_INDYDOG) += indydog.o
>  obj-$(CONFIG_JZ4740_WDT) += jz4740_wdt.o
> -obj-$(CONFIG_WDT_MTX1) += mtx-1_wdt.o
>  obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
>  obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
>  obj-$(CONFIG_OCTEON_WDT) += octeon-wdt.o
> diff --git a/drivers/watchdog/mtx-1_wdt.c b/drivers/watchdog/mtx-1_wdt.c
> deleted file mode 100644
> index f75426cfa425..000000000000
> --- a/drivers/watchdog/mtx-1_wdt.c
> +++ /dev/null
> @@ -1,245 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0+
> -/*
> - *      Driver for the MTX-1 Watchdog.
> - *
> - *      (C) Copyright 2005 4G Systems <info@4g-systems.biz>,
> - *							All Rights Reserved.
> - *                              http://www.4g-systems.biz
> - *
> - *	(C) Copyright 2007 OpenWrt.org, Florian Fainelli <florian@openwrt.org>
> - *      (c) Copyright 2005    4G Systems <info@4g-systems.biz>
> - *
> - *      Release 0.01.
> - *      Author: Michael Stickel  michael.stickel@4g-systems.biz
> - *
> - *      Release 0.02.
> - *	Author: Florian Fainelli florian@openwrt.org
> - *		use the Linux watchdog/timer APIs
> - *
> - *      The Watchdog is configured to reset the MTX-1
> - *      if it is not triggered for 100 seconds.
> - *      It should not be triggered more often than 1.6 seconds.
> - *
> - *      A timer triggers the watchdog every 5 seconds, until
> - *      it is opened for the first time. After the first open
> - *      it MUST be triggered every 2..95 seconds.
> - */
> -
> -#include <linux/module.h>
> -#include <linux/moduleparam.h>
> -#include <linux/types.h>
> -#include <linux/errno.h>
> -#include <linux/miscdevice.h>
> -#include <linux/fs.h>
> -#include <linux/ioport.h>
> -#include <linux/timer.h>
> -#include <linux/completion.h>
> -#include <linux/jiffies.h>
> -#include <linux/watchdog.h>
> -#include <linux/platform_device.h>
> -#include <linux/io.h>
> -#include <linux/uaccess.h>
> -#include <linux/gpio/consumer.h>
> -
> -#define MTX1_WDT_INTERVAL	(5 * HZ)
> -
> -static int ticks = 100 * HZ;
> -
> -static struct {
> -	struct completion stop;
> -	spinlock_t lock;
> -	int running;
> -	struct timer_list timer;
> -	int queue;
> -	int default_ticks;
> -	unsigned long inuse;
> -	struct gpio_desc *gpiod;
> -	unsigned int gstate;
> -} mtx1_wdt_device;
> -
> -static void mtx1_wdt_trigger(struct timer_list *unused)
> -{
> -	spin_lock(&mtx1_wdt_device.lock);
> -	if (mtx1_wdt_device.running)
> -		ticks--;
> -
> -	/* toggle wdt gpio */
> -	mtx1_wdt_device.gstate = !mtx1_wdt_device.gstate;
> -	gpiod_set_value(mtx1_wdt_device.gpiod, mtx1_wdt_device.gstate);
> -
> -	if (mtx1_wdt_device.queue && ticks)
> -		mod_timer(&mtx1_wdt_device.timer, jiffies + MTX1_WDT_INTERVAL);
> -	else
> -		complete(&mtx1_wdt_device.stop);
> -	spin_unlock(&mtx1_wdt_device.lock);
> -}
> -
> -static void mtx1_wdt_reset(void)
> -{
> -	ticks = mtx1_wdt_device.default_ticks;
> -}
> -
> -
> -static void mtx1_wdt_start(void)
> -{
> -	unsigned long flags;
> -
> -	spin_lock_irqsave(&mtx1_wdt_device.lock, flags);
> -	if (!mtx1_wdt_device.queue) {
> -		mtx1_wdt_device.queue = 1;
> -		mtx1_wdt_device.gstate = 1;
> -		gpiod_set_value(mtx1_wdt_device.gpiod, 1);
> -		mod_timer(&mtx1_wdt_device.timer, jiffies + MTX1_WDT_INTERVAL);
> -	}
> -	mtx1_wdt_device.running++;
> -	spin_unlock_irqrestore(&mtx1_wdt_device.lock, flags);
> -}
> -
> -static int mtx1_wdt_stop(void)
> -{
> -	unsigned long flags;
> -
> -	spin_lock_irqsave(&mtx1_wdt_device.lock, flags);
> -	if (mtx1_wdt_device.queue) {
> -		mtx1_wdt_device.queue = 0;
> -		mtx1_wdt_device.gstate = 0;
> -		gpiod_set_value(mtx1_wdt_device.gpiod, 0);
> -	}
> -	ticks = mtx1_wdt_device.default_ticks;
> -	spin_unlock_irqrestore(&mtx1_wdt_device.lock, flags);
> -	return 0;
> -}
> -
> -/* Filesystem functions */
> -
> -static int mtx1_wdt_open(struct inode *inode, struct file *file)
> -{
> -	if (test_and_set_bit(0, &mtx1_wdt_device.inuse))
> -		return -EBUSY;
> -	return stream_open(inode, file);
> -}
> -
> -
> -static int mtx1_wdt_release(struct inode *inode, struct file *file)
> -{
> -	clear_bit(0, &mtx1_wdt_device.inuse);
> -	return 0;
> -}
> -
> -static long mtx1_wdt_ioctl(struct file *file, unsigned int cmd,
> -							unsigned long arg)
> -{
> -	void __user *argp = (void __user *)arg;
> -	int __user *p = (int __user *)argp;
> -	unsigned int value;
> -	static const struct watchdog_info ident = {
> -		.options = WDIOF_CARDRESET,
> -		.identity = "MTX-1 WDT",
> -	};
> -
> -	switch (cmd) {
> -	case WDIOC_GETSUPPORT:
> -		if (copy_to_user(argp, &ident, sizeof(ident)))
> -			return -EFAULT;
> -		break;
> -	case WDIOC_GETSTATUS:
> -	case WDIOC_GETBOOTSTATUS:
> -		put_user(0, p);
> -		break;
> -	case WDIOC_SETOPTIONS:
> -		if (get_user(value, p))
> -			return -EFAULT;
> -		if (value & WDIOS_ENABLECARD)
> -			mtx1_wdt_start();
> -		else if (value & WDIOS_DISABLECARD)
> -			mtx1_wdt_stop();
> -		else
> -			return -EINVAL;
> -		return 0;
> -	case WDIOC_KEEPALIVE:
> -		mtx1_wdt_reset();
> -		break;
> -	default:
> -		return -ENOTTY;
> -	}
> -	return 0;
> -}
> -
> -
> -static ssize_t mtx1_wdt_write(struct file *file, const char *buf,
> -						size_t count, loff_t *ppos)
> -{
> -	if (!count)
> -		return -EIO;
> -	mtx1_wdt_reset();
> -	return count;
> -}
> -
> -static const struct file_operations mtx1_wdt_fops = {
> -	.owner		= THIS_MODULE,
> -	.unlocked_ioctl	= mtx1_wdt_ioctl,
> -	.compat_ioctl	= compat_ptr_ioctl,
> -	.open		= mtx1_wdt_open,
> -	.write		= mtx1_wdt_write,
> -	.release	= mtx1_wdt_release,
> -};
> -
> -
> -static struct miscdevice mtx1_wdt_misc = {
> -	.minor	= WATCHDOG_MINOR,
> -	.name	= "watchdog",
> -	.fops	= &mtx1_wdt_fops,
> -};
> -
> -
> -static int mtx1_wdt_probe(struct platform_device *pdev)
> -{
> -	int ret;
> -
> -	mtx1_wdt_device.gpiod = devm_gpiod_get(&pdev->dev,
> -					       NULL, GPIOD_OUT_HIGH);
> -	if (IS_ERR(mtx1_wdt_device.gpiod)) {
> -		dev_err(&pdev->dev, "failed to request gpio");
> -		return PTR_ERR(mtx1_wdt_device.gpiod);
> -	}
> -
> -	spin_lock_init(&mtx1_wdt_device.lock);
> -	init_completion(&mtx1_wdt_device.stop);
> -	mtx1_wdt_device.queue = 0;
> -	clear_bit(0, &mtx1_wdt_device.inuse);
> -	timer_setup(&mtx1_wdt_device.timer, mtx1_wdt_trigger, 0);
> -	mtx1_wdt_device.default_ticks = ticks;
> -
> -	ret = misc_register(&mtx1_wdt_misc);
> -	if (ret < 0) {
> -		dev_err(&pdev->dev, "failed to register\n");
> -		return ret;
> -	}
> -	mtx1_wdt_start();
> -	dev_info(&pdev->dev, "MTX-1 Watchdog driver\n");
> -	return 0;
> -}
> -
> -static void mtx1_wdt_remove(struct platform_device *pdev)
> -{
> -	/* FIXME: do we need to lock this test ? */
> -	if (mtx1_wdt_device.queue) {
> -		mtx1_wdt_device.queue = 0;
> -		wait_for_completion(&mtx1_wdt_device.stop);
> -	}
> -
> -	misc_deregister(&mtx1_wdt_misc);
> -}
> -
> -static struct platform_driver mtx1_wdt_driver = {
> -	.probe = mtx1_wdt_probe,
> -	.remove = mtx1_wdt_remove,
> -	.driver.name = "mtx1-wdt",
> -};
> -
> -module_platform_driver(mtx1_wdt_driver);
> -
> -MODULE_AUTHOR("Michael Stickel, Florian Fainelli");
> -MODULE_DESCRIPTION("Driver for the MTX-1 watchdog");
> -MODULE_LICENSE("GPL");
> -MODULE_ALIAS("platform:mtx1-wdt");