linux-kernel - Re: [PATCH 1/2] watchdog: imx2_wdt: Allow to continue in low power mode

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Message-ID: <ee2771f2-539d-4bb2-adc1-663e39488148@roeck-us.net>
Date: Wed, 31 Dec 2025 15:41:18 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Nandor Han <nandor.han@...ealthcare.com>
Cc: wim@...ux-watchdog.org, robh@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de,
	kernel@...gutronix.de, festevam@...il.com,
	linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] watchdog: imx2_wdt: Allow to continue in low power
 mode

On Mon, Dec 29, 2025 at 04:49:59PM +0200, Nandor Han wrote:
> By default, the driver suspends the watchdog in low power modes (STOP
> and DOZE). In some situations this is not desired.

Following up on Krzysztof's comment to the devicetree patch:
Assuming the watchdog is in low power mode while the system is
suspended, it is all but impossible to imagine what those situations
might be. A reset by watchdog after the system is suspended simply
does not make sense. A system which must not go into suspend mode
must not be permitted to go into suspend mode to start with, or in
other words suspend mode must not be enabled to start with on such
systems.

Guenter