linux-kernel - Re: [PATCH 2/3] ARM: DTS: imx6q-logicpd: Reduce inrush current on start

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Message-ID: <20190320145723.GE8337@dragon>
Date:   Wed, 20 Mar 2019 22:57:25 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Adam Ford <aford173@...il.com>
Cc:     arm-soc <linux-arm-kernel@...ts.infradead.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] ARM: DTS: imx6q-logicpd: Reduce inrush current on
 start

On Wed, Mar 20, 2019 at 08:41:27AM -0500, Adam Ford wrote:
> On Wed, Mar 20, 2019 at 7:45 AM Shawn Guo <shawnguo@...nel.org> wrote:
> >
> > On Wed, Mar 06, 2019 at 08:04:00AM -0600, Adam Ford wrote:
> > > The main 3.3V regulator sources a series of additional regulators.
> > > This patch adds a small delay, so when the 3.3V regulator comes
> > > on it delays a bit before the subsequent regulators can come on.
> > > This reduces the inrush current a bit on the external DC power
> > > supply.
> > >
> > > Fixes: 1c207f911fe9 ("ARM: dts: imx: Add support for Logic PD
> > > i.MX6QD EVM")
> >
> > Same comment as patch #1.
> 
> The sourcing regulator occasionally cuts out because the inrush is so
> high.  I would argue that preventing a hardware issue like that would
> be a 'fix' and if it helps, I could add that to the description.

Yes, if you would like to get it in as a fix, please elaborate the real
world issue it fixes.

Shawn