linux-kernel - Re: [PATCH 03/18] mtd: dataflash: Export OF module alias information

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Date:	Sat, 22 Aug 2015 02:26:14 +0200
From:	Javier Martinez Canillas <javier@....samsung.com>
To:	Brian Norris <computersforpeace@...il.com>
Cc:	linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>,
	linux-mtd@...ts.infradead.org,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH 03/18] mtd: dataflash: Export OF module alias information

Hello Brian,

On 08/22/2015 12:47 AM, Brian Norris wrote:
> Hi Javier,
> 
> On Fri, Aug 21, 2015 at 12:57:54AM +0200, Javier Martinez Canillas wrote:
>> On 08/21/2015 12:34 AM, Brian Norris wrote:
>>> On Fri, Aug 21, 2015 at 12:13:34AM +0200, Javier Martinez Canillas wrote:
>>>> So this patch really is a no-op right now and is not fixing anything.
>>>> As long as the driver has a MODULE_DEVICE_TABLE(spi,...), things will
>>>
>>> This driver does not have a MODULE_DEVICE_TABLE() at all, nor does it
>>> use spi_device_id. So, it is currently broken for the module use case.
>>>
>>
>> That is correct but also that does not mean that this patch will fix
>> module autoloading right now. It will though once the SPI core is
>> changed to report a OF type module alias.
> 
> Ah, thanks for the patience. I missed the point that it will still be
> broken.
>

No worries, I'm glad that we are on the same page now.
 
>> So what about something along this lines?
>>
>> mtd: dataflash: Export OF module alias information
>>
>> The SPI core currently reports the MODALIAS uevent as "spi:<modalias>"
>> even for SPI devices that were registered by OF.
>>
>> That means the OF module alias exported by MODULE_OF_TABLE(of,...) is
>> currently not used and user-space has no way to autoload this module.
>>
>> But is still a good practice to add the OF module alias information
> 
> nit: s/is/it is/
> 
>> into the kernel module even when currently is unused so once the SPI
> 
> ditto
> 
>> core is changed to report a correct OF modalias uevent, module
>> autoloading will be working for this driver.
> 
> Otherwise, looks good. I'll either patch in this commit message, or
> await v2. Your call.
>

If you don't mind fixing it up yourself when applying, then that
would be really helpful. Otherwise I can post a v2 on Monday.

> Regards,
> Brian
> 

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America
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