linux-kernel - Re: [PATCH v3 1/4] of: adapt of_find_i2c

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Date:	Fri, 25 Jul 2008 14:52:38 -0400
From:	"Grant Likely" <grant.likely@...retlab.ca>
To:	"Jon Smirl" <jonsmirl@...il.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	spi-devel-general@...ts.sourceforge.net,
	dbrownell@...rs.sourceforge.net, linuxppc-dev@...abs.org
Subject: Re: [PATCH v3 1/4] of: adapt of_find_i2c_driver() to be usable by SPI also

On Fri, Jul 25, 2008 at 1:02 PM, Jon Smirl <jonsmirl@...il.com> wrote:
> On 7/25/08, Grant Likely <grant.likely@...retlab.ca> wrote:
>> On Fri, Jul 25, 2008 at 11:40 AM, Jon Smirl <jonsmirl@...il.com> wrote:
>>  > On 7/25/08, Grant Likely <grant.likely@...retlab.ca> wrote:
>>  >>  + * First method is to lookup the compatible value in of_modalias_table.
>>  >>  + * Second is to look for a "linux,<modalias>" entry in the compatible list
>>  >>  + * and used that for modalias.  Third is to strip off the manufacturer
>>  >>  + * prefix from the first compatible entry and use the remainder as modalias
>>  >
>>  > I also think this is a problem. Embedding the name of Linux device
>>  > drivers into device firmware makes it almost impossible to rename the
>>  > device driver.  Again, what is a case where generic part numbers can't
>>  > be listed in the alias section of the linux device driver?
>>  >
>>  > Even eeprom was just fixed to take generic part numbers (at24).
>>
>> Again, I agree, but this change is very much a stop gap measure to get
>>  things working in a sane way without having to create bad device tree
>>  bindings (device tree bindings are hard to change, code is not).  I've
>>  been considering posting a patch to remove this clause from the
>>  functions, but that needs to be reviewed separately from this change.
>
> Isn't putting "compatible="linux,modalias"" into your device tree a
> really bad idea?

Yes, it is, but I still need to preserve existing behavior in this
patch.  That change needs to be reviewed separately.  I'll submit
another patch to deal with this.

g.

-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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