linux-kernel - Re: [PATCH 2/2] watchdog: orion_wdt: use timer1 as a pretimeout

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Date:   Tue, 5 Mar 2019 03:09:44 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Chris Packham <Chris.Packham@...iedtelesis.co.nz>
Cc:     "linux@...ck-us.net" <linux@...ck-us.net>,
        "gregory.clement@...tlin.com" <gregory.clement@...tlin.com>,
        "jason@...edaemon.net" <jason@...edaemon.net>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 2/2] watchdog: orion_wdt: use timer1 as a pretimeout

> > Hi Chris
> > 
> > I had a quick look at other drivers implementing pre-timeout. They
> > seem to call watchdog_notify_pretimeout(). I don't see that here? What
> > happens when timer1 fires?
> > 
> 
> It invokes the regular orion_wdt_irq(). On Armada-385 prior to this 
> change the irq was not specified because the reset always kicked in so 
> there was no point.
> 
> For correctness I could make the devicetree binding specify 2 
> interrupts. One for the regular watchdog interrupt (which would never 
> usually get hit because the reset would kick in) and one for the 
> pretimeout/timer1.

Hi Chris

If the regular watchdog interrupt would never actually fire because
the SoC gets reset, maybe make the IRQ handler call
watchdog_notify_pretimeout()?

	Andrew