linux-kernel - Re: [PATCH v4] watchdog: imx2

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Date:   Thu, 24 Mar 2022 07:08:53 +1000
From:   Alistair <alistair@...stair23.me>
To:     "Guenter Roeck" <linux@...ck-us.net>, shawnguo@...nel.org,
        linux-watchdog@...r.kernel.org, s.hauer@...gutronix.de,
        wim@...ux-watchdog.org,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org
Cc:     devicetree@...r.kernel.org, kernel@...gutronix.de,
        linux-imx@....com, festevam@...il.com,
        "Rob Herring" <robh+dt@...nel.org>
Subject: Re: [PATCH v4] watchdog: imx2_wdg: Allow ping on suspend

On Wed, 23 Mar 2022, at 11:07 PM, Guenter Roeck wrote:
> On 3/23/22 04:57, Alistair Francis wrote:
> > The i.MX watchdog cannot be disabled by software once it has been
> > enabled. This means that it can't be stopped before suspend.
> > 
> > For systems that enter low power mode this is fine, as the watchdog will
> > be automatically stopped by hardware in low power mode. Not all i.MX
> > platforms support low power mode in the mainline kernel. For example the
> > i.MX7D does not enter low power mode and so will be rebooted 2 minutes
> > after entering sleep states.
> > 
> > This patch introduces a device tree property "fsl,ping-during-suspend"
> > that can be used to enable ping on suspend support for these systems.
> > 
> > Signed-off-by: Alistair Francis <alistair@...stair23.me>
> > Reviewed-by: Guenter Roeck <linux@...ck-us.net>
> 
> What is the difference to earlier versions ?

Sorry, I should have included a changelog.

I just fixed the spelling of alow/allow in the title

Alistair

> 
> Guenter
>