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

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Date:	Tue, 22 May 2012 15:49:43 -0700
From:	David Daney <ddaney.cavm@...il.com>
To:	Grant Likely <grant.likely@...retlab.ca>
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 05/22/2012 01:09 PM, Grant Likely wrote:
> 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?

It seems to.  I just sent such a patch in a new thread.

David Daney
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