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

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Message-ID: <CAOMZO5AxsvOhWi47goBm7YuqiLEhZ5fgK4BtCqg_hyLtdWfqfA@mail.gmail.com>
Date:   Mon, 2 Jul 2018 20:14:49 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Robin Gong <yibin.gong@....com>
Cc:     Anson Huang <anson.huang@....com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Fabio Estevam <fabio.estevam@....com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>
Subject: Re: [PATCH v1] ARM: dts: imx6sl-evk: keep sw4 always on

Hi Robin,

On Sun, Jul 1, 2018 at 11:12 PM, Robin Gong <yibin.gong@....com> wrote:

> But in fact, the original dts is not correct without 'regulator-always-
> on'since SW4 is the critical DDR power rail, although, it's kept on in
> the previous kernel by no switches enable/disable interfaces provided
> in pfuze driver. Adding new property which can be done totally by the
> common 'regulator-always-on' is not a good choice. Keep the dts patch
> adding 'regulator-always-on' ahead of pfuze driver pach adding
> enable/disable interface is enough for such case I think.

We really want to avoid  breaking old dtb's running a new kernel.