linux-kernel - Re: [PATCH v5 0/4] watchdog: at91sam9_wdt: handle already configured wdt

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Date:	Tue, 29 Oct 2013 08:50:28 +0100
From:	Wim Van Sebroeck <wim@...ana.be>
To:	Boris BREZILLON <b.brezillon@...rkiz.com>
Cc:	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Landley <rob@...dley.net>,
	Russell King <linux@....linux.org.uk>,
	Fabio Porcedda <fabio.porcedda@...il.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Guenter Roeck <groeck7@...il.com>,
	Yang Wenyou <wenyou.yang@...el.com>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-watchdog@...r.kernel.org
Subject: Re: [PATCH v5 0/4] watchdog: at91sam9_wdt: handle already configured wdt

Hi Boris,

> Hello,
> 
> This patch series is a porposal to enhance the sam9 watchdog timer support.
> 
> The at91sam9 watchdog timer can only be configured once, and the current
> implementation tries to configure it in a static way:
> - 2 seconds timeout
> - wdt restart every 500ms
> 
> If the timer has already been configured with different values, it returns an
> error and do not create any watchdog device.
> 
> This is not critical if the watchdog is disabled, but if it has been enabled
> with different timeout values it will lead to a SoC reset.
> 
> This patch series tries to address this issue by adapting the heartbeat value
> according the WDT timer config:
> - it first tries to configure the timer as requested.
> - if it fails it fallbacks to the current config, adapting its heartbeat timer
> to the needs
> 
> This patch series also move to a dynamically allocated at91wdt device instead
> of the static instance. I'm not sure this is the best solution, so please tell
> me if you prefer to keep static instance of watchdog.
> 
> It adds a new at91 wdt type: software. This new type make use of the at91 wdt
> interrupt to trigger a software reboot.
> 
> Finally it adds several properties to the device tree bindings.
> 
> Best Regards,
> Boris
> 
> Changes since v4:
>  - fix coding style issues
>  - remove unneeded watchdog_active test
> 
> Changes since v3:
>  - fix a bug in heartbeat time computation
>  - fix a bug in at91_wdt_set_timeout when new timeout is bigger than the old
>    one
>  - rename at91_wdt_ping into at91_wdt_start
>  - remove unneeded ping callback assignment
> 
> Changes since v2:
>  - fix documentation
>  - rework the heartbeat computation to get a more flexible behaviour
>  - fix xx_to_yy macros
>  - modify warning and error messages
>  - remove unneeded parenthesis in arithmetic operations
>  - use devm functions to map io memory
>  - remove unneeded devm_kfree calls
> 
> Change since v1:
>  - fix typo in documentaion
>  - fix irq dt definition for sama5d3 SoC
> 
> 
> Boris BREZILLON (4):
>   watchdog: at91sam9_wdt: better watchdog support
>   watchdog: at91sam9_wdt: update device tree doc
>   ARM: at91/dt: add sam9 watchdog default options to SoCs
>   ARM: at91/dt: add watchdog properties to kizbox board
> 
>  .../devicetree/bindings/watchdog/atmel-wdt.txt     |   30 +-
>  arch/arm/boot/dts/at91sam9260.dtsi                 |    5 +
>  arch/arm/boot/dts/at91sam9263.dtsi                 |    5 +
>  arch/arm/boot/dts/at91sam9g45.dtsi                 |    5 +
>  arch/arm/boot/dts/at91sam9n12.dtsi                 |    5 +
>  arch/arm/boot/dts/at91sam9x5.dtsi                  |    5 +
>  arch/arm/boot/dts/kizbox.dts                       |    6 +
>  arch/arm/boot/dts/sama5d3.dtsi                     |    5 +
>  drivers/watchdog/at91sam9_wdt.c                    |  309 ++++++++++++++------
>  9 files changed, 287 insertions(+), 88 deletions(-)

These 4 patches have been added to linux-watchdog-next.

Kind regards,
Wim.

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