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

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Date:	Wed, 17 Sep 2014 08:06:49 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Robin Gong <b38343@...escale.com>
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 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

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