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From: Rob Herring <robh@kernel.org>
Date: Wed, 3 Feb 2016 14:19:31 -0600
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Subject: Re: [PATCH v2 17/26] drm: sun4i: Add DT bindings documentation
To: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Mike Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@codeaurora.org>, David Airlie <airlied@linux.ie>,
        Thierry Reding <thierry.reding@gmail.com>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
        "linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
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        dri-devel <dri-devel@lists.freedesktop.org>,
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        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        Chen-Yu Tsai <wens@csie.org>, Hans de Goede <hdegoede@redhat.com>,
        Alexander Kaplan <alex@nextthing.co>,
        Boris Brezillon <boris.brezillon@free-electrons.com>,
        Wynter Woods <wynter@nextthing.co>,
        Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
        Rob Clark <robdclark@gmail.com>, Daniel Vetter <daniel@ffwll.ch>
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On Wed, Feb 3, 2016 at 1:59 PM, Maxime Ripard
<maxime.ripard@free-electrons.com> wrote:
> Hi Rob,
>
> On Thu, Jan 14, 2016 at 09:15:15PM -0600, Rob Herring wrote:
>> On Thu, Jan 14, 2016 at 04:25:00PM +0100, Maxime Ripard wrote:
>> > The display pipeline of the Allwinner A10 is involving several loosely
>> > coupled components.
>> >
>> > Add a documentation for the bindings.
>> >
>> > Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
>> > ---
>> >  .../bindings/display/sunxi/sun4i-drm.txt           | 228 +++++++++++++++++++++

[...]

>> > +Required properties:
>> > +  - compatible: value must be one of:
>> > +    * allwinner,sun5i-a13-display-engine
>> > +  - allwinner,pipelines: list of phandle to the entry points of the
>> > +    pipelines (either to the frontend or backend)
>> > +
>> > +Example:
>> > +
>> > +panel: panel {
>> > +   compatible = "olimex,lcd-olinuxino-43-ts";
>>
>> This should either be a child of what it is attached to or use of-graph.
>
> You had a similar discussion with Thierry last time I sent it, and it
> seemed to settle on keeping that property:
>
> http://lists.infradead.org/pipermail/linux-arm-kernel/2015-October/382115.html
>
> Has that changed?

No, I still disagree. We already have 2 ways to describe panels: as a
child node of its controller or with of-graph. We don't need a 3rd way
even if it is simple. The problem with of-graph today is too much of
the parsing is left to the individual drivers. We need to fix that and
make it be handled by common code.

Rob