linux-kernel - Re: [PATCH 00/12] rtc: omap: fixes and power-off feature

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Message-ID: <20141022164326.GJ2542@atomide.com>
Date:	Wed, 22 Oct 2014 09:43:26 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Johan Hovold <johan@...nel.org>
Cc:	Felipe Balbi <balbi@...com>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Benoît Cousson <bcousson@...libre.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Lokesh Vutla <lokeshvutla@...com>,
	Guenter Roeck <linux@...ck-us.net>, nsekhar@...com,
	t-kristo@...com, j-keerthy@...com, linux-omap@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/12] rtc: omap: fixes and power-off feature

* Johan Hovold <johan@...nel.org> [141022 09:25]:
> On Wed, Oct 22, 2014 at 08:29:56AM -0700, Tony Lindgren wrote:
> > * Johan Hovold <johan@...nel.org> [141022 04:12]:
> > > On Sat, Oct 11, 2014 at 12:08:18PM -0700, Tony Lindgren wrote:
> > > > * Johan Hovold <johan@...nel.org> [141011 02:42]:
> > > > > On Fri, Oct 10, 2014 at 12:54:22PM -0500, Felipe Balbi wrote:
> > > > > > 
> > > > > > is this power-off feature "RTC-only mode" ?
> > > > > 
> > > > > Yes, I believe so, at least as long as RTC power is maintained. The
> > > > > pmic_power_en pin can otherwise still be used to power off. 
> > > > > 
> > > > > On the BeagleBone the PMIC can be configured to enter OFF or SLEEP mode
> > > > > on power off, where the latter (and default) mode keeps the RTC power
> > > > > supply enabled.
> > > > > 
> > > > > Thanks for the fast review, Felipe.
> > > > 
> > > > Great :) I assume adding the regulator support to this driver should
> > > > also help in the 35xx case?
> > > 
> > > If I remember correctly both OMAP and Sitara 35xx have no on-chip RTC so
> > > they won't be using this driver.
> > 
> > Sorry I made a typo.. I meanto to ask if adding the regulator
> > helps in your 335x case (not 35xx case)?
> 
> Ah, sorry, that's what I first read before I noticed you wrote "35xx"
> twice. :)

Yes sorry my nerves are doing things on their own for some stuff
it seems like :)
 
> Yes, RTC power can be configured as a regulator on am33xx (e.g. provided
> by LDO1 of the PMIC on BBB). I guess you would still need to configure
> it as always-on to be able to use the RTC-only mode, though.

OK great.

Tony
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