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

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Date:	Mon, 10 Feb 2014 08:03:43 +0100
From:	Michal Simek <monstr@...str.eu>
To:	Guenter Roeck <linux@...ck-us.net>
CC:	Michal Simek <michal.simek@...inx.com>,
	linux-kernel@...r.kernel.org, Wim Van Sebroeck <wim@...ana.be>,
	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.

Thanks,
Michal

-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform



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