linux-kernel - Re: how to allow board writers to customize driver behavior (watchdog here)

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Message-Id: <200705241332.30335.rgetz@blackfin.uclinux.org>
Date:	Thu, 24 May 2007 13:32:30 -0400
From:	Robin Getz <rgetz@...ckfin.uclinux.org>
To:	"Paul Mundt" <lethal@...ux-sh.org>
Cc:	"Mike Frysinger" <vapier.adi@...il.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Bryan Wu" <Bryan.Wu@...log.com>
Subject: Re: how to allow board writers to customize driver behavior (watchdog here)

On Thu 24 May 2007 11:23, Paul Mundt pondered:
> 
> Calling it a periodic timer when its in periodic timer mode makes sense.

No disagreements - but I don't think that a watchdog that doesn't cause a 
reset is a periodic timer.

> Why you would want to interface that with a userspace watchdog daemon is
> beyond me, they're conceptually unrelated.

Agreed again - periodic timers have nothing to do with watchdogs. This is 
where I am confused about why you are saying that the only event a watchdog 
can have is a hard reset.

> Please read my original mail on the subject. 

I did. Twice - but maybe I am still missing something. (sorry)

> I'm not advocating hiding a 
> clocksource somewhere in the depths of CONFIG_WATCHDOG, they're
> completely unrelated.

I (and many others) consider a "watchdog" a clock sink - something that needs 
to be poked within certain limits (too fast can indicate a failures just as 
too slow is a failure).

The event or how something is notified of the failure of the watchdog to be 
serviced shouldn't determine what the name is.

    What's in a name? that which we call a watchdog
    By any other name would smell as sweet;
                                         -Bill S

-Robin
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