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

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Message-ID: <d6c61a10-e671-3543-5653-ceb3d9ed60cf@roeck-us.net>
Date:   Wed, 23 Mar 2022 06:07:33 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Alistair Francis <alistair@...stair23.me>, shawnguo@...nel.org,
        linux-watchdog@...r.kernel.org, s.hauer@...gutronix.de,
        wim@...ux-watchdog.org, 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, robh+dt@...nel.org
Subject: Re: [PATCH v4] watchdog: imx2_wdg: Allow ping on suspend

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 ?

Guenter