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

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Message-ID: <CAD=FV=VppmDoREkCq-0HeS-MxUGrPuSRzxK2copG2yZpEg2+rw@mail.gmail.com>
Date:	Thu, 5 Dec 2013 10:15:52 -0800
From:	Doug Anderson <dianders@...omium.org>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Olof Johansson <olof@...om.net>, 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

Guenter and Olof,

On Mon, Dec 2, 2013 at 1:36 PM, Guenter Roeck <linux@...ck-us.net> wrote:
> On Mon, Dec 02, 2013 at 12:47:53PM -0800, Olof Johansson wrote:
>> 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.
>>
> Agreed; same is true for the QUIRK_NEEDS_PMU_CONFIG related registers
> as well.

I have changed all instances of NEED / NEEDS and HAS / HAVE.  Please
take a look.  Since some of those changes applied to Leela Krishna's
patch I'm sending up a "fixup" patch which hopefully he can
incorporate into a v12.

-Doug
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