linux-kernel - Re: [PATCH v2 1/3] ARM: dts: imx6: add pm_power

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Date:	Wed, 17 Sep 2014 15:17:38 +0800
From:	Robin Gong <b38343@...escale.com>
To:	Sascha Hauer <s.hauer@...gutronix.de>
CC:	Shawn Guo <shawn.guo@...escale.com>, <robh+dt@...nel.org>,
	<pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
	<kernel@...gutronix.de>, <sre@...nel.org>, <dbaryshkov@...il.com>,
	<dwmw2@...radead.org>, <grant.likely@...aro.org>,
	<linux@....linux.org.uk>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 1/3] ARM: dts: imx6: add pm_power_off support for
 i.mx6 chips

On Wed, Sep 17, 2014 at 08:06:49AM +0200, Sascha Hauer wrote:
> On Wed, Sep 17, 2014 at 11:45:15AM +0800, Robin Gong wrote:
> > On Wed, Sep 17, 2014 at 10:10:45AM +0800, Shawn Guo wrote:
> > > On Fri, Sep 12, 2014 at 04:48:57PM +0800, Robin Gong wrote:
> > > > All chips of i.mx6 can be powered off by programming SNVS.
> > > > For example :
> > > > On i.mx6q-sabresd board, PMIC_ON_REQ connect with external
> > > > pmic ON/OFF pin, that will cause the whole PMIC powered off
> > > > except VSNVS. And system can restart once PMIC_ON_REQ goes
> > > > high by push POWRER key.
> > > 
> > > What's the behavior for those boards on which PMIC_ON_REQ isn't
> > > connected to anywhere?
> > >
> > System can't be powered off if not connect PMIC_ON_REQ. Although all of our
> > reference design for i.mx6 chips are connecting  PMIC_ON_REQ with external
> > PMIC, we need consider others may not use external PMIC. I'll add the info
> > into commit log or Kconfig.
> 
> You should add the information to the dtsi file in form of a
> status = "disabled" property so that boards that actually have the
> feature can enable it.
> 
> Sascha
Hi Sacha, but that's  SOC level feature and it's harmless even if others don't
want to use this pin to control external PMIC.
> 
> -- 
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