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

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Message-ID: <20200109090950.GJ4456@T480>
Date:   Thu, 9 Jan 2020 17:09:51 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Anson Huang <anson.huang@....com>
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

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.

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

Shawn