linux-kernel - Re: [RFC PATCH 2/3] pinctrl: at91: add support for generic pinconf

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Message-ID: <521B8822.50304@wwwdotorg.org>
Date:	Mon, 26 Aug 2013 10:53:54 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Boris BREZILLON <b.brezillon@...rkiz.com>
CC:	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ian.campbell@...rix.com>,
	Rob Landley <rob@...dley.net>,
	Russell King <linux@....linux.org.uk>,
	Linus Walleij <linus.walleij@...aro.org>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Masanari Iida <standby24x7@...il.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Richard Genoud <richard.genoud@...il.com>,
	Heiko Stuebner <heiko@...ech.de>,
	James Hogan <james.hogan@...tec.com>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH 2/3] pinctrl: at91: add support for generic pinconf

On 08/24/2013 03:37 PM, Boris BREZILLON wrote:
> Add support for generic pin configuration to pinctrl-at91 driver.

> diff --git a/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt

>  Required properties for iomux controller:
> -- compatible: "atmel,at91rm9200-pinctrl"
> +- compatible: "atmel,at91rm9200-pinctrl" or "atmel,at91sam9x5-pinctrl".

You seem to also be adding a second chip name to the list here, which is
more than the patch subject/description imply you're doing...

> +  Add "generic-pinconf" to the compatible string list to use the generic pin
> +  configuration syntax.

"generic-pinconf" is too generic of a compatible value for this binding
to define.

Instead, I think you want to either:

a)

Use compatible="atmel,at91rm9200-pinctrl" for the old binding,
use compatible="atmel,at91rm9200-pinctrl-generic" for the new binding

or:

b)

Define Boolean property atmel,generic-pinconf (perhaps a better name
could be chosen?). If it's not present, parse the node assuming the old
binding. If it is present, parse the node assuming the new binding.

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