linux-kernel - Re: m25p80: Commit "allow arbitrary OF matching for "jedec,spi-nor"" breaks module autoloading

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Message-ID: <20151112185926.GC8456@google.com>
Date:	Thu, 12 Nov 2015 10:59:26 -0800
From:	Brian Norris <computersforpeace@...il.com>
To:	Heiner Kallweit <hkallweit1@...il.com>
Cc:	linux-mtd@...ts.infradead.org,
	Javier Martinez Canillas <javier@....samsung.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org,
	Mark Brown <broonie@...nel.org>
Subject: Re: m25p80: Commit "allow arbitrary OF matching for "jedec,spi-nor""
 breaks module autoloading

+ others

On Sat, Oct 03, 2015 at 11:54:16PM +0200, Heiner Kallweit wrote:
> Seems like commit 43163022927b6e7d202a7e6f939c3f392465494d
> (allow arbitrary OF matching for "jedec,spi-nor") broke autoloading
> of the m25p80 module.
> MODALIAS is "spi:spi-nor" and removing "spi-nor" as device alias
> prevents module autoloading.
> 
> Of course we could revert the removal of the "spi-nor" device alias.
> However it might be better to switch to DT-based matching for
> DT-configured devices.
> 
> Adding a call to of_device_uevent_modalias to spi_uevent in spi.c
> solved the issue for me, drawback however is that just the first
> "compatible" value is used as modalias. In case of m25p80 this means
> that "jedec,spi-nor" has to be the first "compatible" value.
> This constraint might be too strict ..
> 
> Having said that I'm not sure what could be a better way to fix
> the issue than just re-introducing the "spi-nor" device alias.

Is this [1] getting fixed in SPI any time soon? Looks like there was
some progress [2], but AFAICT it's not completed.

I'd just like to know what the way forward here should be for m25p80.
Really, "jedec,spi-nor" never autoloaded modules very reliably because
of the SPI core constaints. So I'm not sure I'd consider this a
regression, and I might be OK waiting around if it'll be fixed in a
reasonable time frame.

FWIW, I can do testing if somebody's tackling this still. Just CC me.

Regards,
Brian

[1] https://lkml.org/lkml/2014/9/11/458
[2] https://lkml.org/lkml/2015/8/20/109
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