linux-kernel - Re: [patch 09/14] Convert from class

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Date:	Fri, 24 Aug 2007 00:12:52 +0200
From:	Kay Sievers <kay.sievers@...y.org>
To:	David Brownell <david-b@...bell.net>
Cc:	Tony Jones <tonyj@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: [patch 09/14] Convert from class_device to device for SPI

On Thu, 2007-08-23 at 14:03 -0700, David Brownell wrote:
> On Tuesday 21 August 2007, Tony Jones wrote:
> > I believe this is the necessary documentation changes.
> 
> Thanks.  I have an update, plus updates for the mmc_spi
> driver (now in MM) which you didn't update.
> 
> By the way, it's worth noting an incompatibility introduced
> through these conversions and CONFIG_SYSFS_DEPRECATED=n:
> 
>  - previously .../controller/spi_master:spi2 would be a
>    symlink to /sys/class/spi_master/spi2

These "find the class device which has me as the parent"-symlinks are
removed with CONFIG_SYSFS_DEPRECATED=n, because these devices are direct
child directories now below the bus device and there is no need for such
links.

>  - now, /sys/class/spi_master/spi2 is a symlink to
>    .../controller/spi_master (with DEPRECATED=n).

Ugh! Are you sure, that is doesn't point to:
  .../controller/spi_master/spi2/ ?

> The symlink direction is just noise ... the issue is that with
> this approach it's no longer possible to have one controller
> handle multiple SPI busses!  A fix would involve maintaining
> the original "spi_master:spi2" name.

Sounds like a bug if that's what happened. Can you paste the output of
"tree" for the relevant parts here?

Thanks,
Kay


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