linux-kernel - Re: [PATCH v2 2/2] drivers/watchdog: ASPEED reference dev tree properties for config

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Date:   Wed, 28 Jun 2017 10:52:16 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Christopher Bostic <cbostic@...ux.vnet.ibm.com>
Cc:     wim@...ana.be, robh+dt@...nel.org, mark.rutland@....com,
        joel@....id.au, linux-watchdog@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] drivers/watchdog: ASPEED reference dev tree
 properties for config

On Wed, Jun 28, 2017 at 11:09:15AM -0500, Christopher Bostic wrote:
> 
> >>
> >>Why would there even be a need configure for no system reset?  The external
> >>mode 'wdt ext: External signal enable after timeout' can be sent off chip
> >>even if system reset is disabled.  The watchdog is doing something in this
> >>case and would require wdt instantiation.
> >>
> >Wouldn't that be "aspeed,external-signal" ?
> Yes that optional parameter would need to be specified in that situation, as
> well as 'aspeed,no-system-reset'.
> 

Ok, makes sense (after looking into the datasheet). The missing detail
is that there is a separate configuration bit for "Reset system after
timeout", which is set in addition to reset_{sys,soc,arm}.

Thanks,
Guenter