linux-kernel - Re: The future of DT binding maintainership

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Date:	Tue, 23 Jul 2013 08:55:10 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Tomasz Figa <tomasz.figa@...il.com>
CC:	Jon Loeliger <jdl@....com>,
	"Chaiken, Alison" <Alison_Chaiken@...tor.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Wolfram Sang <w.sang@...gutronix.de>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ian.campbell@...rix.com>,
	Pawel Moll <pawel.moll@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Olof Johansson <olof@...om.net>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: Re: The future of DT binding maintainership

On 07/22/2013 02:57 PM, Tomasz Figa wrote:
> On Monday 22 of July 2013 16:34:49 Jon Loeliger wrote:

>>> My idea is to implement compile time verification in dtc, so I guess it
>>> will be more like the latter. Since dts is what dtc can already parse,
>>> my plan is to keep the schemas in spirit to dts, just
>>> modifying/extending it to allow specifying bindings with them, rather
>>> than static values.

> Things start to become fun when you get to bindings like regulators or 
> clocks, when part of the binding is defined on generic level (-supply, 
> clocks, clock-names properties) and remaining part is specific to device 
> (XXX in XXX-supply, count and order of clocks and clock-names, strings 
> allowed in clock-names property). This kind of inheritance is likely to be 
> the biggest troublemaker.

It's good you mentioned inheritance here. I believe that's one of the
key things. For example, the Tegra GPIO controller's binding is-a
GPIO-controller, and is-an interrupt-controller, and I imagine any
successful DT schema definition would very explicitly include that
information. Likewise, other nodes may be is-a GPIO-client (many times,
each parameterized with the property name that defines which GPIO you're
talking abot), and also may be is-an interrupt-client (with a similar
comment), etc.

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