[PATCH] mfd: mc13xxx: Configure WDI reset

[mpa@pengutronix.de (Markus Pargmann)]

Hi,

On Mon, Sep 08, 2014 at 02:06:36PM +0200, Philippe R?tornaz wrote:
> Le 08/09/2014 11:25, Markus Pargmann a ?crit :
> >Hi,
> >
> >On Mon, Sep 08, 2014 at 09:42:35AM +0200, Philippe R?tornaz wrote:
> >>Hello
> >>
> >>Le 08/09/2014 09:01, Markus Pargmann a ?crit :
> >>>Setup the PMIC to make a restart when a watchdog interrupt occures.
> >>>If this is not configured, the PMIC will shut down the power supply
> >>>without a restart.
> >>
> >>
> >>Well, this was used to poweroff the mx31moboard board.
> >>So we need to be able to configure the functionality.
> >
> >So on mx31moboard the watchdog interrupt always leads to a poweroff instead of
> >a reset?
> 
> Well, no, it simply doesn't work since the output pin is not enabled :)
> We enable the watchdog output only in pm_power_off().
> 
> >Perhaps it would be better to switch back to poweroff on
> >watchdog interrupt right before the shutdown watchdog interrupt is
> >triggered.
> 
> Yes, we definitely should be doing this.
> The only point is that we don't have currently access to the PMIC
> from pm_power_off().
> Is there a clean/recommended way to do it ?

An exported function in the pmic mfd driver that switches between
poweroff/reset on watchdog interrupt may be ok for this. In the board
pm_power_off routine you could then use of_find_device_by_node() or
something similar to get the device struct and pass it to the function.

Best Regards,

Markus

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