[PATCH 1/4] mfd: tps65217: Set PMIC to shutdowm on PWR_EN toggle
anilkumar at ti.com
Wed Nov 14 01:11:45 EST 2012
On Wed, Nov 14, 2012 at 10:40:18, AnilKumar, Chimata wrote:
> On Wed, Nov 14, 2012 at 07:53:42, Mark Brown wrote:
> > On Mon, Nov 05, 2012 at 05:59:36PM +0100, Benoit Cousson wrote:
> > > On 11/05/2012 10:42 AM, AnilKumar Ch wrote:
> > > > +Optional properties:
> > > > +- ti,pmic-shutdown-controller: Telling the PMIC to shutdown on PWR_EN toggle.
> > > That sounds like a generic functionality to me. Don't we have some more
> > > generic way to handle that?
> > > If not, that should probably not be a TI only attribute.
> > It's pretty unusual to have this configurable as a single thing rather
> > than as part of flexible power sequencing or something that's just fixed
> > in silicon.
>From these two threads we can infer that this is handled in power_off
sequence only. And this is feature of PMIC to go to shutdown mode nothing
to be fixed in silicon. PWR_EN line can be connected to any of these like
PRCM control or GPIO or some other instead of RTC(in this case).
> "[PATCH 2/4] rtc: OMAP: Add system pm_power_off to rtc driver" thread
> have the details of how PMIC is connected to RTC module of SoC.
> As part of the power_off sequence we have
> 1. To write STATUS_OFF in TPS65217 PMIC. If we do so then PMIC will
> go to shutdown if PWR_EN is pulled-down. (This patch doing this)
> 2. To pull down the PWR_EN signal we have to set PMIC_PWR_EN in RTC
> module and trigger ALARM2 event. (This piece of code in 2/4 patch).
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