Re: [PATCH 1/7] watchdog: add keep alive support

[Sascha Hauer <s.hauer@pengutronix.de>]

On Fri, Nov 16, 2012 at 06:55:39PM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> this will allow to ping the watchdog via poller
> 
>  /*
>   * Note: this simple framework supports one watchdog only.
>   */
>  static struct watchdog *watchdog;
>  
> +static void watchdog_poller_func(struct poller_struct *poller)
> +{
> +	watchdog->keep_alive(watchdog);
> +}
> +
> +static struct poller_struct watchdog_poller = {
> +	.func = watchdog_poller_func,
> +};
> +
>  int watchdog_register(struct watchdog *wd)
>  {
>  	if (watchdog != NULL)
>  		return -EBUSY;
>  
>  	watchdog = wd;
> +
> +	if (watchdog->keep_alive) {
> +		int ret;
> +
> +		ret = poller_register(&watchdog_poller);
> +		if (ret) {
> +			watchdog = NULL;
> +			return ret;
> +		}
> +	}

Currently the watchdog is supposed to be kept alive with periodically
calling the watchdog (or wd) command. A user may decide to just
periodically ping the watchdog from C code, but this should be a users
decision (i.e. some enhancement to the wd command) and should be
available for i.MX aswell.

Sascha


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