linux-kernel - Re: [PATCH v1 2/5] mmc: mxs-mmc: add dt probe support

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Message-ID: <20120314071307.GK3852@pengutronix.de>
Date:	Wed, 14 Mar 2012 08:13:07 +0100
From:	"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>
To:	Marek Vasut <marek.vasut@...il.com>
Cc:	Dong Aisheng <aisheng.dong@...escale.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Dong Aisheng-B29396 <B29396@...escale.com>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"vinod.koul@...ux.intel.com" <vinod.koul@...ux.intel.com>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"grant.likely@...retlab.ca" <grant.likely@...retlab.ca>,
	"rdunlap@...otime.net" <rdunlap@...otime.net>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>,
	"cjb@...top.org" <cjb@...top.org>,
	Guo Shawn-R65073 <r65073@...escale.com>
Subject: Re: [PATCH v1 2/5] mmc: mxs-mmc: add dt probe support

On Wed, Mar 14, 2012 at 08:09:22AM +0100, Marek Vasut wrote:
> Dear Dong Aisheng,
> 
> > On Wed, Mar 14, 2012 at 01:58:25PM +0800, Marek Vasut wrote:
> > > Dear Dong Aisheng,
> > > 
> > > > Signed-off-by: Dong Aisheng <dong.aisheng@...aro.org>
> > 
> > ........
> > 
> > > > +static const struct of_device_id mxs_mmc_dt_ids[] = {
> > > > +	{ .compatible = "fsl,imx23-mmc", .data = NULL, },
> > > > +	{ .compatible = "fsl,imx28-mmc", .data = NULL, },
> > > 
> > > Do you really need two distinct ones here?
> > 
> > Hmm, my original purpose is to put soc difference data in .data
> > to remove cpu_is_* function calls in the driver later.
> > Do you think if any issue?
> > 
> 
> Well, what's the difference between the interfaces on mx233 and mx28? Is it 
> something that can't be encoded otherwise? I think they're not so different.

They differ in the register layout. Matching two different compatible
strings is the right way here I think.

Sascha

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