[PATCH v2 0/4] watchdog: at91sam9_wdt: handle already configured wdt

[boris brezillon]

Hello Yang,

Did you test/review this series ?

If you did, could you add your Acked, Reviewed and/or Tested-by.
I'd really like to get this series merged to mainline.

Thanks.

Best Regards,
Boris

On 21/06/2013 09:19, Boris BREZILLON wrote:
> 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
>
> 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                    |  319 +++++++++++++++-----
>   9 files changed, 300 insertions(+), 85 deletions(-)
>