linux-kernel - Re: [PATCH v2 2/2] watchdog: s3c2410_wdt: Report when the watchdog reset the system

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Date:	Fri, 6 Dec 2013 11:54:19 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Wim Van Sebroeck <wim@...ana.be>,
	Leela Krishna Amudala <l.krishna@...sung.com>,
	Olof Johansson <olof@...om.net>,
	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-samsung-soc@...r.kernel.org, linux-watchdog@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] watchdog: s3c2410_wdt: Report when the watchdog
 reset the system

On Thu, Dec 05, 2013 at 10:15:29AM -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.
> 
> Note that exynos4 SoCs also provide the reset status, but providing
> that is left as an exercise for future changes and is not plumbed up
> in this patch series.  Also note the exynos4 SoCs don't appear to need
> any PMU config, which is why this patch separates the concepts of
> having PMU Registers vs. needing PMU Config.
> 
> Signed-off-by: Doug Anderson <dianders@...omium.org>
> ---
> Changes in v2:
> - Explained QUIRK organization in patch descritpion.
> - Reduced indentation as per Olof and Tomasz suggestion.
> - Now atop proposed v12 of Leela Krishna's patches.

Hi Doug,

The patch doesn't apply on top of v12, unfortunately.

> - NEEDS => HAS, EXYNOS5 prefix
> 
>  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 6a00299..45a9503 100644
> --- a/drivers/watchdog/s3c2410_wdt.c
> +++ b/drivers/watchdog/s3c2410_wdt.c
> @@ -62,9 +62,15 @@
>  #define CONFIG_S3C2410_WATCHDOG_ATBOOT		(0)
>  #define CONFIG_S3C2410_WATCHDOG_DEFAULT_TIME	(15)
>  
> +#define EXYNOS5_RST_STAT_REG_OFFSET		0x0404
>  #define EXYNOS5_WDT_DISABLE_REG_OFFSET		0x0408
>  #define EXYNOS5_WDT_MASK_RESET_REG_OFFSET	0x040c
>  #define QUIRK_HAS_PMU_CONFIG			(1 << 0)
> +#define QUIRK_HAS_RST_STAT			(1 << 1)
> +
> +/* These quirks require that we have a PMU register map */
> +#define QUIRKS_HAVE_PMUREG			(QUIRK_HAS_PMU_CONFIG | \
> +						 QUIRK_HAS_RST_STAT)
>  
>  static bool nowayout	= WATCHDOG_NOWAYOUT;
>  static int tmr_margin;
> @@ -98,6 +104,9 @@ MODULE_PARM_DESC(debug, "Watchdog debug, set to >1 for debug (default 0)");
>   * timer reset functionality.
>   * @mask_bit: Bit number for the watchdog timer in the disable register and the
>   * mask reset register.
> + * @rst_stat_reg: Offset in pmureg for the register that has the reset status.
> + * @rst_stat_bit: Bit number in the rst_stat register indicating a watchdog
> + * reset.
>   * @quirks: A bitfield of quirks.
>   */
>  
> @@ -105,6 +114,8 @@ struct s3c2410_wdt_variant {
>  	int disable_reg;
>  	int mask_reset_reg;
>  	int mask_bit;
> +	int rst_stat_reg;
> +	int rst_stat_bit;
>  	u32 quirks;
>  };
>  
> @@ -131,14 +142,20 @@ static const struct s3c2410_wdt_variant drv_data_exynos5250  = {
>  	.disable_reg = EXYNOS5_WDT_DISABLE_REG_OFFSET,
>  	.mask_reset_reg = EXYNOS5_WDT_MASK_RESET_REG_OFFSET,
>  	.mask_bit = 20,
> -	.quirks = QUIRK_HAS_PMU_CONFIG
> +	.rst_stat_reg = EXYNOS5_RST_STAT_REG_OFFSET,
> +	.rst_stat_bit = 20,
> +	.quirks = QUIRK_HAS_PMU_CONFIG |
> +		QUIRK_HAS_RST_STAT,

Any reason not to use QUIRKS_HAVE_PMUREG ?

>  };
>  
>  static const struct s3c2410_wdt_variant drv_data_exynos5420 = {
>  	.disable_reg = EXYNOS5_WDT_DISABLE_REG_OFFSET,
>  	.mask_reset_reg = EXYNOS5_WDT_MASK_RESET_REG_OFFSET,
>  	.mask_bit = 0,
> -	.quirks = QUIRK_HAS_PMU_CONFIG
> +	.rst_stat_reg = EXYNOS5_RST_STAT_REG_OFFSET,
> +	.rst_stat_bit = 9,
> +	.quirks = QUIRK_HAS_PMU_CONFIG |
> +		QUIRK_HAS_RST_STAT,

Same here. Even if you don't use QUIRKS_HAVE_PMUREG, the continuation line is not needed.

Thanks,
Guenter
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