linux-kernel - Re: [RFC PATCH 2/2] dt: spi: s3c64xx: add compatible to controller-data

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Date:	Wed, 29 Jul 2015 15:00:46 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Michal Suchanek <hramrach@...il.com>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	Kukjin Kim <kgene@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Padmavathi Venna <padma.kvr@...il.com>,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mtd@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-spi@...r.kernel.org
Subject: Re: [RFC PATCH 2/2] dt: spi: s3c64xx: add compatible to
 controller-data

On Wed, Jul 29, 2015 at 12:19:57PM +0200, Michal Suchanek wrote:

Please use subject lines matching the style for the subsytsem so people
can spot that the patch is in some way relevant.

> The controller-data subnode has no compatible. This can lead to other
> drivers getting confused by it. Add a compatible to make devicetreee
> unambiguous.

I can't tell from this commit message what the issue you're trying to
fix is, sorry.  Nodes without compatible strings are entirely normal and
don't need compatible strings.  It sounds like a bug in whatever other
driver is becoming confused.

> +	if (!of_get_property(data_np, "compatible", NULL) ||
> +	    strcmp(of_get_property(data_np, "compatible", NULL),
> +		   "samsung,s3c-controller-data"))
> +		dev_err(&spi->dev, "child node 'controller-data' does not have correct compatible\n");

This will break all existing users which is not acceptable for
mainline, we need to preserve compatibility with existing device trees.

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