linux-kernel - RE: [PATCH 01/10] watchdog: xilinx: Convert driver to the watchdog framework

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Date:	Mon, 10 Feb 2014 17:18:11 +0000
From:	Guenter Roeck <groeck@...iper.net>
To:	"monstr@...str.eu" <monstr@...str.eu>,
	Guenter Roeck <linux@...ck-us.net>
CC:	Michal Simek <michal.simek@...inx.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Wim Van Sebroeck <wim@...ana.be>,
	"linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH 01/10] watchdog: xilinx: Convert driver to the watchdog
 framework

> -----Original Message-----
> From: Michal Simek [mailto:monstr@...str.eu]
> Sent: Sunday, February 09, 2014 11:04 PM
> To: Guenter Roeck
> Cc: Michal Simek; linux-kernel@...r.kernel.org; Wim Van Sebroeck;
> linux-watchdog@...r.kernel.org; linux-arm-kernel@...ts.infradead.org
> Subject: Re: [PATCH 01/10] watchdog: xilinx: Convert driver to the
> watchdog framework
> 
> On 02/09/2014 09:03 PM, Guenter Roeck wrote:
> > On 01/31/2014 06:18 AM, Michal Simek wrote:
> >> - Remove uneeded headers, fops functions
> >> - Use xilinx_wdt prefix in start/stop/keepalive functions
> >>    and in new structures
> >>
> >> Signed-off-by: Michal Simek <michal.simek@...inx.com>
> >
> > Hi Michal,
> >
> >>   static int xwdt_probe(struct platform_device *pdev)
> >>   {
> >>       int rc;
> >> @@ -314,7 +184,7 @@ static int xwdt_probe(struct platform_device
> *pdev)
> >>                       "xlnx,wdt-enable-once", NULL);
> >>       if (tmptr == NULL) {
> >>           pr_warn("Parameter \"xlnx,wdt-enable-once\" not found in
> device tree!\n");
> >> -        xdev.nowayout = WATCHDOG_NOWAYOUT;
> >> +        watchdog_set_nowayout(&xilinx_wdt_wdd, true);
> >
> > Sure you want to set this to always true instead of using
> WATCHDOG_NOWAYOUT ?
> 
> I have checked it and
> option CONFIG_WATCHDOG_NOWAYOUT - Disable watchdog shutdown on close
> 
> with this part in the header
> 
> 100 #ifdef CONFIG_WATCHDOG_NOWAYOUT
> 101 #define WATCHDOG_NOWAYOUT               1
> 102 #define WATCHDOG_NOWAYOUT_INIT_STATUS   (1 << WDOG_NO_WAY_OUT)
> 103 #else
> 104 #define WATCHDOG_NOWAYOUT               0
> 105 #define WATCHDOG_NOWAYOUT_INIT_STATUS   0
> 106 #endif
> 
> enable once is hardware option and it means when this option is setup
> in hw you can't stop watchdog. That's why I think that setting up true
> instead of WATCHDOG_NOWAYOUT is correct.
> 

Ok, makes sense.

Guenter


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