linux-kernel - Re: [RESEND PATCH v2 3/3] ARM: dts: imx28-cfa10036: Fix the reset gpio signal polarity

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Message-ID: <20181009002031.GU3587@dragon>
Date:   Tue, 9 Oct 2018 08:20:33 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Vokáč Michal <Michal.Vokac@...ft.com>
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Fabio Estevam <fabio.estevam@....com>,
        Rob Herring <robh+dt@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>
Subject: Re: [RESEND PATCH v2 3/3] ARM: dts: imx28-cfa10036: Fix the reset
 gpio signal polarity

On Mon, Oct 08, 2018 at 11:45:36AM +0000, Vokáč Michal wrote:
> On 27.9.2018 11:24, Michal Vokáč wrote:
> > The reset signal of the SSD1306 OLED display is actually active-low.
> > Adapt the DT to reflect the real world.
> > 
> > Signed-off-by: Michal Vokáč <michal.vokac@...ft.com>
> > ---
> > v2 changes: New patch in the series
> 
> Bartlomiej just queued the first two patches for v4.20.
> Will somebody take this one? Otherwise this SoM will end up with
> broken OLED display reset.

Well, it means the change breaks the ABI between kernel and device tree,
e.g. the new kernel will not work with existing/installed DTBs.

Shawn