linux-kernel - Re: [PATCH v4 2/2] watchdog: Add sysfs interface for MEN A21 watchdog

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Message-ID: <20130529083527.GA12478@jtlinux>
Date:	Wed, 29 May 2013 10:35:27 +0200
From:	Johannes Thumshirn <johannes.thumshirn@....de>
To:	Wim Van Sebroeck <wim@...ana.be>
CC:	<linux-watchdog@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 2/2] watchdog: Add sysfs interface for MEN A21 watchdog

On Mon, May 27, 2013 at 09:41:54PM +0200, Wim Van Sebroeck wrote:
> Hi Johannes,
>
> > This patch adds a sysfs interface for the watchdog device found on MEN A21
> > Boards.
> >
> > The newly generated files are:
> > * rebootcause:
> > Can be one of:
> > Power on Reset,
> > CPU Reset Request,
> > Push Button,
> > FPGA Reset Request,
> > Watchdog,
> > Local Power Bad,
> > Invalid or
> > BDI
> > and shows the reason of the boards last reboot.
>
> Question: why don't you use the detection of the reboot cause in your driver
> initialization so that you can:
> 1) report the reboot cause at the start of the driver (like we do in most
> drivers that support these kind of features)
> 2) set the .bootstatus info in the watchdog_device struct data?
> (See the WDIOF flags in #include <uapi/linux/watchdog.h>
> #define	WDIOF_OVERHEAT		0x0001	/* Reset due to CPU overheat */
> #define	WDIOF_FANFAULT		0x0002	/* Fan failed */
> #define	WDIOF_EXTERN1		0x0004	/* External relay 1 */
> #define	WDIOF_EXTERN2		0x0008	/* External relay 2 */
> #define	WDIOF_POWERUNDER	0x0010	/* Power bad/power fault */
> #define	WDIOF_CARDRESET		0x0020	/* Card previously reset the CPU */
> #define	WDIOF_POWEROVER		0x0040	/* Power over voltage */
> #define	WDIOF_SETTIMEOUT	0x0080  /* Set timeout (in seconds) */
> #define	WDIOF_MAGICCLOSE	0x0100	/* Supports magic close char */
> #define	WDIOF_PRETIMEOUT	0x0200  /* Pretimeout (in seconds), get/set */
> #define	WDIOF_ALARMONLY		0x0400	/* Watchdog triggers a management or
> 					   other external alarm not a reboot */
> #define	WDIOF_KEEPALIVEPING	0x8000	/* Keep alive ping reply */
> (Example driver: wdt_pci.c )).
>
> Kind regards,
> Wim.
>

Ok I'll do. Should I repost this as a change of this patch or the "add driver"
patch?

Regards,
Johannes
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