linux-kernel - RE: [PATCH 1/5] ARM: dts: imx6qdl-sabresd: Remove incorrect power supply assignment

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Date:   Thu, 9 Jan 2020 09:25:35 +0000
From:   Anson Huang <anson.huang@....com>
To:     Shawn Guo <shawnguo@...nel.org>
CC:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "andreas@...nade.info" <andreas@...nade.info>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH 1/5] ARM: dts: imx6qdl-sabresd: Remove incorrect power
 supply assignment

Hi, Shawn

> Subject: Re: [PATCH 1/5] ARM: dts: imx6qdl-sabresd: Remove incorrect
> power supply assignment
> 
> On Thu, Jan 09, 2020 at 08:25:03AM +0000, Anson Huang wrote:
> > Hi, Shawn
> >
> > > Subject: Re: [PATCH 1/5] ARM: dts: imx6qdl-sabresd: Remove incorrect
> > > power supply assignment
> > >
> > > On Mon, Dec 30, 2019 at 09:41:07AM +0800, Anson Huang wrote:
> > > > The vdd3p0's input should be from external USB VBUS directly, NOT
> > >
> > > Shouldn't USB VBUS usually be 5V?  It doesn't seem to match 3.0V
> > > which is suggested by vdd3p0 name.
> > >
> > > > PMIC's sw2, so remove the power supply assignment for vdd3p0.
> > > >
> > > > Fixes: 93385546ba36 ("ARM: dts: imx6qdl-sabresd: Assign
> > > > corresponding power supply for LDOs")
> > >
> > > Is it only a description correcting or is it fixing a real problem?
> > > I'm trying to understand it is a 5.5-rc material or can be applied for 5.6.
> > >
> >
> > It is fixing a real problem about USB LDO voltage, that is why we noticed
> this issue.
> 
> Okay, please describe the problem a little bit in the commit log.  Also squash
> the series into one patch, which is easier to be merged into -rc as a fix.

OK, will send a new patch with squashing them together, but will NOT have the fix tag,
is it OK? As the fix tag are different for each patch.

> 
> My question above that USB VUBS is 5V which doesn't match 3.0V suggested
> by vdd3p0 name remains unaddressed though.

The vdd3p0 is a LDO, the input is the USB VBUS 5V, output can be programmed to
3.2V, I think the name is from the target output voltage.

Anson