linux-kernel - Re: [PATCH] of: match the compatible in the order set by the dts file

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Message-ID: <20130709070541.GQ516@pengutronix.de>
Date:	Tue, 9 Jul 2013 09:05:41 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Huang Shijie <b32955@...escale.com>
Cc:	grant.likely@...aro.org, devicetree-discuss@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, rob.herring@...xeda.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] of: match the compatible in the order set by the dts file

On Fri, Jul 05, 2013 at 04:43:38PM +0800, Huang Shijie wrote:
> If we set the uart compatible in the dts file like this:
>    ------------------------------------------------------
>     compatible = "fsl,imx6q-uart", "fsl,imx21-uart";
>    ------------------------------------------------------
> 
> and we set the uart compatible in the uart driver like this:
>    ------------------------------------------------------
> 	{ .compatible = "fsl,imx1-uart", ... },
> 	{ .compatible = "fsl,imx21-uart", ... },
> 	{ .compatible = "fsl,imx6q-uart", ... },
> 	{ /* sentinel */ }
>    ------------------------------------------------------
> 
> the current code will match the "fsl,imx21-uart" in the end.
> 
> Of course, this is not what we want. We want it to match the "fsl,imx6q-uart".
> 
> This patch rewrites the match code, and make it to check the compatible
> in the order set by the DTS file.

Why don't you set the matching order in the driver the way you want it
to be, i.e.:

	{ .compatible = "fsl,imx6q-uart", ... },
	{ .compatible = "fsl,imx21-uart", ... },
	{ .compatible = "fsl,imx1-uart", ... },

Sascha


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