Re: [RFC PATCH 0/4] watchdog: at91sam9_wdt: handle already configuredwdt
From: boris brezillon
Date: Fri Jun 21 2013 - 02:59:50 EST
On 21/06/2013 03:47, Yang, Wenyou wrote:
>> -----Original Message-----
>> From: linux-arm-kernel [mailto:linux-arm-kernel-bounces@xxxxxxxxxxxxxxxxxxx]
>> On Behalf Of Boris BREZILLON
>> Sent: 2013年6月11日 18:51
>> To: Wim Van Sebroeck; Jean-Christophe Plagniol-Villard; Ferre, Nicolas;
>> Cc: devicetree-discuss@xxxxxxxxxxxxxxxx; linux-doc@xxxxxxxxxxxxxxx;
>> linux-kernel@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; Boris
>> Subject: [RFC PATCH 0/4] watchdog: at91sam9_wdt: handle already configured
>> This patch series is a porposal to enhance the sam9 watchdog timer support.
>> The at91sam9 watchdog timer cannot configured twice, and the current
>> implementation only tries to configure 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 watchdog.
>> Finally it adds several properties to the device tree bindings.
>> Best Regards,
>> 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 | 319
>> 9 files changed, 300 insertions(+), 85 deletions(-)
> Tested on sama5d34ek, at91sam9g25ek, linux-next_20130620
> Tested by Wenyou Yang <Wenyou.yang@xxxxxxxxx>
Thanks for your tests and review.
>> linux-arm-kernel mailing list
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