Re: [PATCH 3/4] watchdog: da9062: reset board on watchdog timeout

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

On Wed, Sep 23, 2026 at 01:17:18PM +0200, Primoz Fiser wrote:
> From: Andrej Picej <andrej.picej@norik.com>
> 
> Implement a method to change watchdog timeout configuration based on DT
> binding ("dlg,wdt-sd"). There is a possibility to change the behaviour
> of watchdog reset. Setting WATCHDOG_SD bit enables SHUTDOWN mode, and
> clearing it enables POWERDOWN mode on watchdog timeout.
> 
> If no DT binding is specified the WATCHDOG_SD bit stays in default
> configuration, not breaking behaviour of devices which might depend on
> default fuse configuration.
> 
> Note: This patch requires that the config register CONFIG_I is
> configured as writable in the da9061/2 multi function device.
> 

Please reword to something like:

Implement a method to change watchdog timeout configuration based on the
"dlg,wdt-sd" devicetree property. Setting the WATCHDOG_SD bit enables
SHUTDOWN mode, and clearing it enables POWERDOWN mode on watchdog timeout.

If no devicetree property is specified, the WATCHDOG_SD bit stays in default
configuration, not breaking behaviour of devices which might depend on
default fuse configuration.

Specifically, "There is a possibility ..." should not be part of the
description at all, and "Note:" should not be part of the description
and be moved below "---".

> Signed-off-by: Andrej Picej <andrej.picej@norik.com>
> Tested-by: Christoph Niedermaier <cniedermaier@dh-electronics.com>
> Reviewed-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
> Acked-by: Guenter Roeck <linux@roeck-us.net>
> Reviewed-by: Guenter Roeck <linux@roeck-us.net>
> Signed-off-by: Primoz Fiser <primoz.fiser@norik.com>
> ---
>  drivers/watchdog/da9062_wdt.c | 27 +++++++++++++++++++++++++++
>  1 file changed, 27 insertions(+)
> 
> diff --git a/drivers/watchdog/da9062_wdt.c b/drivers/watchdog/da9062_wdt.c
> index 3d7bf2f351db..7ceef8cd7425 100644
> --- a/drivers/watchdog/da9062_wdt.c
> +++ b/drivers/watchdog/da9062_wdt.c
> @@ -204,8 +204,11 @@ static int da9062_wdt_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
>  	unsigned int timeout;
> +	unsigned int mask;
>  	struct da9062 *chip;
>  	struct da9062_watchdog *wdt;
> +	int ret;
> +	u32 val;
>  
>  	chip = dev_get_drvdata(dev->parent);
>  	if (!chip)
> @@ -245,6 +248,30 @@ static int da9062_wdt_probe(struct platform_device *pdev)
>  		set_bit(WDOG_HW_RUNNING, &wdt->wdtdev.status);
>  	}
>  
> +	/*
> +	 * Configure what happens on watchdog timeout. Can be specified with
> +	 * "dlg,wdt-sd" dt-binding (0 -> POWERDOWN, 1 -> SHUTDOWN).
> +	 * If "dlg,wdt-sd" dt-binding is NOT set use the default.

This is not really what he code below does.
It sets the mode to shutdown if val is != 0, not if it is 1.

> +	 */
> +	ret = device_property_read_u32(dev, "dlg,wdt-sd", &val);
> +	if (!ret) {
> +		if (val)
> +			/* Use da9062's SHUTDOWN mode */
> +			mask = DA9062AA_WATCHDOG_SD_MASK;
> +		else
> +			/* Use da9062's POWERDOWN mode. */
> +			mask = 0x0;
> +
> +		ret = regmap_update_bits(wdt->hw->regmap,
> +						DA9062AA_CONFIG_I,
> +						DA9062AA_WATCHDOG_SD_MASK,
> +						mask);

CHECK: Alignment should match open parenthesis
#157: FILE: drivers/watchdog/da9062_wdt.c:266:
+               ret = regmap_update_bits(wdt->hw->regmap,
+                                               DA9062AA_CONFIG_I,

Also, this does not require an additional variable.

		ret = regmap_update_bits(wdt->hw->regmap,
					 DA9062AA_CONFIG_I,
					 DA9062AA_WATCHDOG_SD_MASK,
					 val ? DA9062AA_WATCHDOG_SD_MASK : 0);

> +
> +		if (ret)
> +			dev_err(dev, "failed to set wdt reset mode: %d\n",
> +				ret);

			return dev_err_probe(dev, ret,
					     "failed to set wdt reset mode\n");

Thanks,
Guenter