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    SubjectRe: [PATCH v13 4/4] Watchdog: introduce ARM SBSA watchdog driver
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    On 02/16/2016 09:08 AM, fu.wei@linaro.org wrote:
    > From: Fu Wei <fu.wei@linaro.org>
    >
    > According to Server Base System Architecture (SBSA) specification,
    > the SBSA Generic Watchdog has two stage timeouts: the first signal (WS0)
    > is for alerting the system by interrupt, the second one (WS1) is a real
    > hardware reset.
    > More details about the hardware specification of this device:
    > ARM DEN0029B - Server Base System Architecture (SBSA)
    >
    > This driver can operate ARM SBSA Generic Watchdog as a single stage watchdog
    > or a two stages watchdog, it's set up by the module parameter "action".
    > In the single stage mode, when the timeout is reached, your system
    > will be reset by WS1. The first signal (WS0) is ignored.
    > In the two stages mode, when the timeout is reached, the first signal (WS0)
    > will trigger panic. If the system is getting into trouble and cannot be reset
    > by panic or restart properly by the kdump kernel(if supported), then the
    > second stage (as long as the first stage) will be reached, system will be
    > reset by WS1. This function can help administrator to backup the system
    > context info by panic console output or kdump.
    >
    > This driver bases on linux kernel watchdog framework, so it can get
    > timeout from module parameter and FDT at the driver init stage.
    >
    > Signed-off-by: Fu Wei <fu.wei@linaro.org>
    > Reviewed-by: Graeme Gregory <graeme.gregory@linaro.org>
    > Tested-by: Pratyush Anand <panand@redhat.com>
    > Acked-by: Timur Tabi <timur@codeaurora.org>
    > Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
    > Tested-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>

    Reviewed-by: Guenter Roeck <linux@roeck-us.net>

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