From: Robert Schwebel <r.schwebel@pengutronix•de>
To: Simon Richter <Simon.Richter@hogyros•de>
Cc: linuxppc-dev@ozlabs•org, linuxppc-embedded@ozlabs•org
Subject: Re: Generic MMC-over-SPI binding?
Date: Tue, 8 Jan 2008 17:11:20 +0100 [thread overview]
Message-ID: <20080108161120.GC3177@pengutronix.de> (raw)
In-Reply-To: <47838708.5050008@hogyros.de>
On Tue, Jan 08, 2008 at 03:22:00PM +0100, Simon Richter wrote:
> in an embedded system similar to the lite5200 board, there is an MMC
> card socket connected to one of the PSCs. Ideally, I'd like to express
> this fact via the device tree and have the kernel bind the mmc-spi
> driver to the SPI interface, but I cannot find any place where to insert
> this code that I feel comfortable with.
>
> - It is not a board-specific thing, because any board can just use any
> SPI bus for MMC.
>
> - The mmc-spi driver appears to be platform independent, so I'm not
> sure OF bindings should be added to it.
>
> - The generic device tree scanning does not contain any special cases
> yet, so I don't want to add one.
>
> My current thought is to create a new driver that just handles MMC on
> PSCs in SPI mode by gluing all the relevant drivers together, but that
> doesn't seem optimal to me either.
You know this driver?
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=drivers/mmc/host/mmc_spi.c;h=365024b83d3da9df9b6e4f7a9d4cf6d216ba523d;hb=HEAD
Or is your question how to express this in the device tree?
Robert
--
Dipl.-Ing. Robert Schwebel | http://www.pengutronix.de
Pengutronix - Linux Solutions for Science and Industry
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next prev parent reply other threads:[~2008-01-08 16:11 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-08 14:22 Generic MMC-over-SPI binding? Simon Richter
2008-01-08 16:11 ` Robert Schwebel [this message]
2008-01-08 16:29 ` Simon Richter
2008-01-08 17:27 ` Arnd Bergmann
2008-01-09 17:17 ` Simon Richter
2008-01-09 21:55 ` Arnd Bergmann
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