From mboxrd@z Thu Jan  1 00:00:00 1970
From: Russell King - ARM Linux <linux@arm.linux.org.uk>
Subject: Re: [PATCH 1/1] mmc: host: enable OMAP DMA engine support for omap
 hosts by default
Date: Sat, 25 Aug 2012 08:57:42 +0100
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To: Peter Meerwald <pmeerw@pmeerw.net>
Cc: Kevin Hilman <khilman@ti.com>, Javier Martinez Canillas <martinez.javier@gmail.com>, linux-omap@vger.kernel.org, Tony Lindgren <tony@atomide.com>, linux-mmc@vger.kernel.org, "Shilimkar, Santosh" <santosh.shilimkar@ti.com>, Chris Ball <cjb@laptop.org>, Javier Martinez Canillas <javier@dowhile0.org>, linux-arm-kernel@lists.infradead.org
List-Id: linux-omap@vger.kernel.org

On Fri, Aug 24, 2012 at 02:10:38PM +0200, Peter Meerwald wrote:
> with Linux 3.6-rc3:
> 
> CONFIG_DMA_OMAP=m
> CONFIG_DMA_ENGINE=y
> CONFIG_DMA_VIRTUAL_CHANNELS=m
> CONFIG_MMC_OMAP_HS=y
> CONFIG_SPI_OMAP24XX=y
> CONFIG_MTD_NAND_OMAP2=y
> 
>   LD      init/built-in.o
> drivers/built-in.o: In function `omap2_mcspi_setup':
> /home/pmeerw/linux-pmeerw/drivers/spi/spi-omap2-mcspi.c:859: undefined reference to `omap_dma_filter_fn'
> drivers/built-in.o: In function `omap_nand_probe':
> /home/pmeerw/linux-pmeerw/drivers/mtd/nand/omap2.c:1371: undefined reference to `omap_dma_filter_fn'
> drivers/built-in.o: In function `omap_hsmmc_probe':
> /home/pmeerw/linux-pmeerw/drivers/mmc/host/omap_hsmmc.c:2039: undefined reference to `omap_dma_filter_fn'
> make: *** [vmlinux] Error 1
> 
> in addition to SPI and MMC, there seems to be also a NAND dependency

Yes.  Unlike the PL08x driver, OMAP has no way to pass the filter function
into its drivers, and I didn't want the pain of fiddling around with DT
crap to try and work out how to do this.  So what you have here is
something that I got as far as I could, and TI then wanted it pushed into
mainline.

I have no solution for the above at present - the long term solution is
to sort out how to deal with DMA engine with DT etc.  At the moment,
there has been discussion about this but no solution.