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

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Date:   Mon, 2 Jul 2018 01:03:11 +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 9:00 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
> 
> Hi Anson,
> 
> On Sun, Jul 1, 2018 at 9:57 PM, Anson Huang <anson.huang@....com> wrote:
> 
> > Just want to know how to handle such case? The kernel patch will never
> > be applied or is there any way to make kernel patch and dtb patch
> > applied together to avoid any breakage?
> 
> We always want to avoid breaking a working dtb when it is used with a newer
> kernel.
> 
> In this case we need to revert the kernel patch as it causes regression with old
> dtbs.
 
So that mean such kind of kernel patch will never be into kernel? Even if it is a
necessary patch for fixing some other issues? I just wonder how this case being
handled.

Anson.