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

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Date:   Tue, 9 Oct 2018 09:51:43 +0200
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     Shawn Guo <shawnguo@...nel.org>
Cc:     Vokáč Michal <Michal.Vokac@...ft.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 10/09/2018 02:20 AM, Shawn Guo wrote:
> 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.

Should I revert this sdd10307fb patch then?

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics