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

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Date:	Wed, 22 Oct 2014 18:21:04 +0200
From:	Johan Hovold <johan@...nel.org>
To:	Tony Lindgren <tony@...mide.com>
Cc:	Johan Hovold <johan@...nel.org>, 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

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, 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.

Johan
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