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

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Message-ID: <aVz3Q34/nchMuqVX@shlinux89>
Date: Tue, 6 Jan 2026 19:51:31 +0800
From: Peng Fan <peng.fan@....nxp.com>
To: Nandor Han <nandor.han@...ealthcare.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

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.

Regards,
Peng

>
>Signed-off-by: Nandor Han <nandor.han@...ealthcare.com>
>---
> Documentation/devicetree/bindings/watchdog/fsl-imx-wdt.yaml | 6 ++++++
> 1 file changed, 6 insertions(+)
>
>diff --git a/Documentation/devicetree/bindings/watchdog/fsl-imx-wdt.yaml b/Documentation/devicetree/bindings/watchdog/fsl-imx-wdt.yaml
>index 34951783a633..4dd9cc81c926 100644
>--- a/Documentation/devicetree/bindings/watchdog/fsl-imx-wdt.yaml
>+++ b/Documentation/devicetree/bindings/watchdog/fsl-imx-wdt.yaml
>@@ -64,6 +64,12 @@ properties:
>       If present, the watchdog device is suspended in WAIT mode
>       (Suspend-to-Idle). Only supported on certain devices.
> 
>+  fsl,wdt-continue-in-low-power:
>+    $ref: /schemas/types.yaml#/definitions/flag
>+    description: |
>+      If present, the watchdog device continues to run in low power modes
>+      (STOP and DOZE). By default, the watchdog is suspended in these modes.
>+
> required:
>   - compatible
>   - interrupts
>-- 
>2.39.5
>