linux-kernel - Re: [PATCH 00/23] Nokia N950 display support

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Message-ID: <CACvgo53yG4U471fv4nw4czVKKc8=NQsD_37Gxf_3vX8638tBWQ@mail.gmail.com>
Date:	Mon, 28 Mar 2016 13:34:51 +0100
From:	Emil Velikov <emil.l.velikov@...il.com>
To:	Sebastian Reichel <sre@...nel.org>
Cc:	Tony Lindgren <tony@...mide.com>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	linux-omap@...r.kernel.org,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	ML dri-devel <dri-devel@...ts.freedesktop.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/23] Nokia N950 display support

Hi Sebastian,

On 9 March 2016 at 17:09, Sebastian Reichel <sre@...nel.org> wrote:
> Hi Emil,
>
> On Wed, Mar 09, 2016 at 04:19:48PM +0000, Emil Velikov wrote:
>> Hi Sebastian,
>>
>> On 8 March 2016 at 16:39, Sebastian Reichel <sre@...nel.org> wrote:
>>
>> >  arch/arm/boot/dts/omap3-n950-n9.dtsi            |  72 +++++++++
>> >  arch/arm/boot/dts/omap3-n950.dts                |  71 +++++++++
>> Just a friendly reminder that updating these and one will have to keep
>> the driver backwards compatible forever.
>
> Of course. Basically the new DT properties are:
>
>  * optional regulators (vpnl & vddi)
>  * boolean "has-dsi-backlight"
>  * resolution-x/y
>  * offset-x/y
>
> So probably not that much of a problem even if other API is
> invented. I just noticed, that I forgot to actually add documentation
> in Documentation/devicetree/bindings/display/panel/panel-dsi-cm.txt
>
> I will fix that in the next patchset revision.
>
>> Tomi, has been in the process of removing all the unneeded cruft,
>> although omapdrm it is still using the custom panel, dsi and other
>> code as opposed to the ones provided by DRM. As he gets to reusing
>> those he might have some fun keeping things compatible.
>
> I could not find "generic" panel binding documentation. Can you
> give me a pointer? I can just stick to the same property names
> to avoid potential future problems.
>
Pardon for the late reply.

As mentioned in another email, if you're interested in reusing the drm
panel infrastructure you should be looking in
Documentation/devicetree/bindings/display/panel/. With display-timing
panel-dpi panel-dsi-cm and (optional) simple-panel as a start.

Would reshuffling/documenting things make it more obvious ? Feel free
to let Rob Herring, Thierry Reding know.

Regards,
Emil