linux-kernel - Re: [PATCH 09/19] drm: sun4i: Add DT bindings documentation

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Message-ID: <CAL_Jsq+viBYCzw_YvVu0zVbPFb8r42+ma-wBcw1bbyOKUTaEYg@mail.gmail.com>
Date:	Sun, 1 Nov 2015 08:28:59 -0600
From:	Rob Herring <robh@...nel.org>
To:	Thierry Reding <thierry.reding@...il.com>
Cc:	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Mike Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	David Airlie <airlied@...ux.ie>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-clk@...r.kernel.org,
	dri-devel <dri-devel@...ts.freedesktop.org>,
	linux-sunxi <linux-sunxi@...glegroups.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Chen-Yu Tsai <wens@...e.org>,
	Hans de Goede <hdegoede@...hat.com>,
	Alexander Kaplan <alex@...tthing.co>,
	Wynter Woods <wynter@...tthing.co>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Rob Clark <robdclark@...il.com>,
	Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH 09/19] drm: sun4i: Add DT bindings documentation

On Fri, Oct 30, 2015 at 12:37 PM, Thierry Reding
<thierry.reding@...il.com> wrote:
> On Fri, Oct 30, 2015 at 11:40:03AM -0500, Rob Herring wrote:
>> On Fri, Oct 30, 2015 at 9:20 AM, Maxime Ripard
> [...]
>> > +Optional properties:
>> > +  - allwinner,tv-encoder: phandle to the TV Encoder in our pipeline
>> > +  - allwinner,panel: phandle to the panel used in our RGB interface
>>
>> Use of-graph please.
>
> Why? Panels are a really simple resource and a simple phandle is fully
> capable of describing the relationship.

So we can have some consistency in bindings and common parsing code.
It is simple when it is just a panel, but when it can be tv-encoder or
other board level downstream bridge devices it doesn't stay so simple.
Also, we already have a simple way to do panels which is as a child
node. Let's not have a third way.

Rob
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