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

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Message-ID: <AM3PR04MB1315D8EF80847B4AF1FF4BA5F5430@AM3PR04MB1315.eurprd04.prod.outlook.com>
Date:   Mon, 2 Jul 2018 01:19:20 +0000
From:   Anson Huang <anson.huang@....com>
To:     Fabio Estevam <festevam@...il.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



Anson Huang
Best Regards!


> -----Original Message-----
> From: Fabio Estevam [mailto:festevam@...il.com]
> Sent: Monday, July 2, 2018 9:17 AM
> 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?

Sure, I agree for now. As I did NOT want to have any breakage. Thanks.
 
Anson.