Re: Generic MMC-over-SPI binding?
From: Robert Schwebel <hidden>
Date: 2008-01-08 16:11:20
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 Handelsregister: Amtsgericht Hildesheim, HRA 2686 Hannoversche Str. 2, 31134 Hildesheim, Germany Phone: +49-5121-206917-0 | Fax: +49-5121-206917-9