linux-kernel - Re: [RFC 8/8] ARM: dts: imx6qdl-sabresd: Enable fsl,ldo-bypass

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Message-ID: <1490794343.5481.33.camel@nxp.com>
Date:   Wed, 29 Mar 2017 16:32:23 +0300
From:   Leonard Crestez <leonard.crestez@....com>
To:     Lucas Stach <l.stach@...gutronix.de>
CC:     Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Mark Rutland <mark.rutland@....com>,
        <devicetree@...r.kernel.org>, Anson Huang <Anson.Huang@....com>,
        Irina Tirdea <irina.tirdea@....com>,
        <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        "Octavian Purdila" <octavian.purdila@....com>,
        Fabio Estevam <fabio.estevam@....com>,
        Robin Gong <yibin.gong@....com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC 8/8] ARM: dts: imx6qdl-sabresd: Enable fsl,ldo-bypass

On Wed, 2017-03-22 at 18:13 +0100, Lucas Stach wrote:
> Am Mittwoch, den 22.03.2017, 18:53 +0200 schrieb Leonard Crestez:

> > This enables LDO bypass by default on the imx6qdl-sabresd boards. New
> > dts files with -ldo suffix are added for users who want to run with LDOs
> > enabled on these boards anyway.

> Given that using LDO bypass affects the device lifetime negatively (see
> AN4724), I think the default should still be to use LDO enabled mode and
> have new DTs for people that desire to shorten the lifetime of the SoC
> for a minimal drop in power consumption.

This was based on what the Freescale BSP does, I don't particularly
object to upstream having a different default. It would be nice for
testing if this ldo-bypass path was enabled by default for some boards
but it's not a very good reason.

I will switch the default.

-- 
Regards,
Leonard