linux-kernel - Re: [RFC, PATCH] watchdog on gpio

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Message-Id: <200801111740.25754.florian.fainelli@telecomint.eu>
Date:	Fri, 11 Jan 2008 17:40:25 +0100
From:	Florian Fainelli <florian.fainelli@...ecomint.eu>
To:	Marc Pignat <marc.pignat@...s.ch>
Cc:	wim@...ana.be, linux-kernel@...r.kernel.org
Subject: Re: [RFC, PATCH] watchdog on gpio

Hello Marc,

Your patch looks good to me, and I have been waiting for something like 
this :). Other comments below.

Le jeudi 10 janvier 2008, Marc Pignat a écrit :
> +#include <asm/uaccess.h>
> +#include <asm/arch/gpio.h>

At first sight, this will only work with the platforms which have implemented 
gpiolib, some (like MIPS) still use the old generic GPIO API. So I think the 
include will not work here for anything than ARM, correct me if I am wrong.

> +static int gpio_wdt_keepalive(struct gpio_wdt *wdt)
> +{
> +	gpio_set_value(wdt->pdata->pin, 0);
> +	gpio_set_value(wdt->pdata->pin, 1);
> +	return 0;
> +}

Some watchdog drivers requires you to toggle the full GPIO line, not only one 
bit (I particularly think about the MTX-1 board watchdog).

Did you look into hooking into Wim's uniform watchdog driver :

http://git.kernel.org/?p=linux/kernel/git/wim/linux-2.6-watchdog-experimental.git;a=commit;h=732c54027e6c866f98857c4a6d1c6c466459dcd5

Maybe you can save some code ?

-- 
Cordialement, Florian Fainelli
------------------------------
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