From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756826Ab3LEQF7 (ORCPT ); Thu, 5 Dec 2013 11:05:59 -0500 Received: from mail-pb0-f49.google.com ([209.85.160.49]:56305 "EHLO mail-pb0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751615Ab3LEQFz (ORCPT ); Thu, 5 Dec 2013 11:05:55 -0500 Date: Thu, 5 Dec 2013 08:00:27 -0800 From: Guenter Roeck To: Leela Krishna Amudala Cc: Tomasz Figa , Olof Johansson , Doug Anderson , Wim Van Sebroeck , Kukjin Kim , Ben Dooks , "linux-arm-kernel@lists.infradead.org" , "linux-samsung-soc@vger.kernel.org" , "linux-watchdog@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH] watchdog: s3c2410_wdt: Report when the watchdog reset the system Message-ID: <20131205160027.GA13200@roeck-us.net> References: <1386008082-28740-1-git-send-email-dianders@chromium.org> <20131202202120.GA23611@roeck-us.net> <20131202213654.GA4059@roeck-us.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Dec 05, 2013 at 01:27:13PM +0530, Leela Krishna Amudala wrote: > Hi Guenter Roeck, > > On Tue, Dec 3, 2013 at 3:06 AM, Guenter Roeck 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 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 > > > >> --- > > > >> This patch is based atop Leela Krishna's recent series that ends with > > > >> (ARM: dts: update watchdog device nodes for Exynos5250 and Exynos5420) > > > >> AKA . > > > >> > > > >> 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. > > > > As Tomasz Figa suggested I introduced quirks, > 'quirk' implies a workaround for non-standard or broken hardware, not a flag indicating device specific functionality. Guenter