linux-kernel - Re: [PATCH v1] ARM: dts: imx6sl-evk: keep sw4 always on

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Date:   Sun, 1 Jul 2018 22:17:15 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Anson Huang <anson.huang@....com>
Cc:     Shawn Guo <shawnguo@...nel.org>, Robin Gong <yibin.gong@....com>,
        Mark Rutland <mark.rutland@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        dl-linux-imx <linux-imx@....com>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v1] ARM: dts: imx6sl-evk: keep sw4 always on

On Sun, Jul 1, 2018 at 10:09 PM, Anson Huang <anson.huang@....com> wrote:

> On some new i.MX platforms, PFuze switches are used for supplying GPU/VPU
> or other non-critical modules only, these switches need to be turned off by
> runtime PM to avoid very high power leakage, like on mScale850D.

Ok, in this case I suggest adding a new property so that the switches
can be turned off only when the new property is present.

When this new property is absent, then we keep the current behavior
and avoid dtb breakage.

Since MX8M support is not in place yet, this is not urgent, so I will
send a revert and then you can re-work the patch so that it does not
affect the old dtbs.

Do you agree with such approach?