Re: [PATCH v12 4/4] Watchdog: introduce ARM SBSA watchdog driver

[Guenter Roeck]

On 02/16/2016 12:36 AM, fu.wei@xxxxxxxxxx wrote:
> From: Fu Wei <fu.wei@xxxxxxxxxx>
>
> 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@xxxxxxxxxx>
> Reviewed-by: Graeme Gregory <graeme.gregory@xxxxxxxxxx>
> Tested-by: Pratyush Anand <panand@xxxxxxxxxx>
> Acked-by: Timur Tabi <timur@xxxxxxxxxxxxxx>
> Reviewed-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
> ---
>   drivers/watchdog/Kconfig     |  20 +++
>   drivers/watchdog/Makefile    |   1 +
>   drivers/watchdog/sbsa_gwdt.c | 403 +++++++++++++++++++++++++++++++++++++++++++
>   3 files changed, 424 insertions(+)
>
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index 0f6d851..ed9a5cb 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig

[ ... ]

> +
> +static int sbsa_gwdt_probe(struct platform_device *pdev)
> +{

[ ... ]

> +		if (!action)
> +			dev_warn(dev, "falling back to signle stage mode.\n");

Still:

s/signle/single/

[ ... ]

> +
> +MODULE_DESCRIPTION("SBSA Generic Watchdog Driver");
> +MODULE_AUTHOR("Fu Wei <fu.wei@xxxxxxxxxx>");
> +MODULE_AUTHOR("Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>");
> +MODULE_AUTHOR("Al Stone <al.stone@xxxxxxxxxx>");
> +MODULE_AUTHOR("Timur Tabi <timur@xxxxxxxxxxxxxx>");
> +MODULE_LICENSE("GPL v2");
Do you need a MODULE_ALIAS ?

Guenter