linux-kernel - Re: [PATCH] watchdog: s3c2410_wdt: Report when the watchdog reset the system

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Date:	Mon, 2 Dec 2013 12:47:53 -0800
From:	Olof Johansson <olof@...om.net>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Doug Anderson <dianders@...omium.org>,
	Wim Van Sebroeck <wim@...ana.be>,
	Leela Krishna Amudala <l.krishna@...sung.com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Ben Dooks <ben-linux@...ff.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] watchdog: s3c2410_wdt: Report when the watchdog reset the system

On Mon, Dec 2, 2013 at 12:21 PM, Guenter Roeck <linux@...ck-us.net> wrote:
> On Mon, Dec 02, 2013 at 10:14:41AM -0800, Doug Anderson wrote:
>> A good watchdog driver is supposed to report when it was responsible
>> for resetting the system.  Implement this for the s3c2410, at least on
>> exynos5250 and exynos5420 where we already have a pointer to the PMU
>> registers to read the information.
>>
>> Signed-off-by: Doug Anderson <dianders@...omium.org>
>> ---
>> This patch is based atop Leela Krishna's recent series that ends with
>> (ARM: dts: update watchdog device nodes for Exynos5250 and Exynos5420)
>> AKA <https://patchwork.kernel.org/patch/3251861/>.
>>
>>  drivers/watchdog/s3c2410_wdt.c | 42 +++++++++++++++++++++++++++++++++++++++---
>>  1 file changed, 39 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c
>> index 47f4dcf..2c87d37 100644
>> --- a/drivers/watchdog/s3c2410_wdt.c
>> +++ b/drivers/watchdog/s3c2410_wdt.c
>> @@ -62,9 +62,13 @@
>>  #define CONFIG_S3C2410_WATCHDOG_ATBOOT               (0)
>>  #define CONFIG_S3C2410_WATCHDOG_DEFAULT_TIME (15)
>>
>> +#define RST_STAT_REG_OFFSET          0x0404
>>  #define WDT_DISABLE_REG_OFFSET               0x0408
>>  #define WDT_MASK_RESET_REG_OFFSET    0x040c
>>  #define QUIRK_NEEDS_PMU_CONFIG               (1 << 0)
>> +#define QUIRK_HAS_RST_STAT           (1 << 1)
>> +#define QUIRKS_NEED_PMUREG           (QUIRK_NEEDS_PMU_CONFIG | \
>> +                                      QUIRK_HAS_RST_STAT)
>>
> I am not really happy about the NEED (both of them, really) here.
> How about HAS instead ?

Ah, I just commented on these things on our internal review site too
on this patch. I don't even think a quirk is needed -- just use the
presence of a non-0 rst_stat_reg to tell if you need to use regmap.


-Olof
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