linux-kernel - Re: [PATCH 1/3] of: Add prefix parameter to of_modalias

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Date:	Tue, 22 May 2012 14:09:50 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	David Daney <ddaney.cavm@...il.com>
Cc:	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	Rob Herring <rob.herring@...xeda.com>,
	"spi-devel-general@...ts.sourceforge.net" 
	<spi-devel-general@...ts.sourceforge.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Liam Girdwood <lrg@...com>,
	Tabi Timur-B04825 <B04825@...escale.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH 1/3] of: Add prefix parameter to of_modalias_node().

On Tue, May 22, 2012 at 1:45 PM, David Daney <ddaney.cavm@...il.com> wrote:
> On 05/19/2012 11:08 PM, Grant Likely wrote:
>>
>> On Sat, 19 May 2012 23:54:36 -0600, Grant
>> Likely<grant.likely@...retlab.ca>  wrote:
>>>
>>> On Fri, 11 May 2012 15:05:21 -0700, David Daney<ddaney.cavm@...il.com>
>>>  wrote:
>>>>
>>>> From: David Daney<david.daney@...ium.com>
>>>>
>>>> When generating MODALIASes, it is convenient to add things like "spi:"
>>>> or "i2c:" to the front of the strings.  This allows the standard
>>>> modprobe to find the right driver when automatically populating bus
>>>> children from the device tree structure.
>>>>
>>>> Add a prefix parameter, and adjust callers.  For
>>>> of_register_spi_devices() use the "spi:" prefix.
>>>>
>>>> Signed-off-by: David Daney<david.daney@...ium.com>
>>>
>>>
>>> Applied, thanks.  Some notes below...
>>
>>
>> Wait... why is this necessary?
>
>
> Because in of_register_spi_devices() in of_spi.c, you do:
>
>        request_module(spi->modalias);
>
> The string passed to request_module() must have the "spi:" prefix.

How about modifying the call to request_module() to include the prefix
also?  I think that would be a simpler change overall.  Would that
work?

g.
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