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

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Date:   Tue, 3 Jul 2018 08:10:32 -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@....com" <mark.rutland@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        dl-linux-imx <linux-imx@....com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v1] ARM: dts: imx6sl-evk: keep sw4 always on

Hi Anson,

On Tue, Jul 3, 2018 at 4:44 AM, Anson Huang <anson.huang@....com> wrote:

> It is NOT easy to identify which switch is critical or NOT, and different platforms
> have different board design, it will introduce many platform specified code, so I think
> just revert the pfuze100 switch enable/disable patch should be OK for now.

I have sent the pfuze100 regulator patch revert and it is linux-next
now. Should probably reach 4.18-rc4.

> After a couple of release cycles, add the pfuze100 switch enable/disable patch
> back to support this feature, I believe users should switch to new dtb with "regulator-always-on"
> existing already.

That will still break old dtb compatibility.

You cannot force users to use "regulator-always-on" and the old dtbs
need to always work.

So whatever new feature you need to introduce it needs to be done in
such a way that the existing dtb's will continue working.