linux-kernel - Re: [PATCH 2/2] dt-bindings: watchdog: fsl-imx: document continue in low power mode

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Message-ID: <9f77a920-0ddb-4918-bba1-816b37727d52@gehealthcare.com>
Date: Wed, 7 Jan 2026 12:29:57 +0200
From: Nandor Han <nandor.han@...ealthcare.com>
To: Peng Fan <peng.fan@....nxp.com>
Cc: wim@...ux-watchdog.org, linux@...ck-us.net, 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 2/2] dt-bindings: watchdog: fsl-imx: document continue in
 low power mode


On 1/6/26 13:51, Peng Fan wrote:
> CAUTION: This email originated from outside of GE HealthCare. Only open links or attachments if you trust the sender. Report suspicious emails using Outlook’s “Report” button.
>
> Hi Nandor,
>
> On Mon, Dec 29, 2025 at 04:50:00PM +0200, Nandor Han wrote:
>> Property "fsl,wdt-continue-in-low-power" allows the watchdog to continue
>> running in low power modes (STOP and DOZE). By default, the watchdog is
>> suspended in these modes. This property provides the option to keep the
>> watchdog active during low power states when needed.
> >From the cover letter, I see that system should reset if runs into
> low power mode. So your system are not allowed to run into low power mode.
>
> If my understanding is correct, DT property should not be used.
> You may need to use sysfs or module_parameter for your case.

Thanks Peng.

Yes, you're correct, our system should not run in low power mode.

My implementation is based on the fact that the driver provides already a Device Tree configuration for the WAIT low power mode.
To maintainconsistency, the patch simply extends support to configure the watchdog during STOP and DOZE power modes.

One important consideration is that the watchdog must be fully configured during boot to catch any potential issues early.
Since this is a hardware property of the watchdog, we considered that device tree is a good place for this configuration.

Regards,
Nandor