[PATCH 12/15] spi/s3c64xx: Add support DMA engine API

[Russell King - ARM Linux]

On Tue, Aug 09, 2011 at 09:43:32AM +0530, Alim Akhtar wrote:
> Exactly, spi_s3c64xx.c (including Sound driver) can not be used with
> pl080 and pl330 (DMAENGINE drivers) as it is.
> Recently I was trying to use PL080 DMAENGINE driver, and i was ended
> up using some #ifdef in the spi driver.
> something like
> #ifdef CONFIG_PL080
> sdd->tx_dmac.bus_id = dmatx_res->name;
> sdd->rx_dmac.bus_id = dmarx_res->name;
> #else
> sdd->tx_dmac.bus_id = dmatx_res->start;
> sdd->tx_dmac.bus_id = dmatx_res->start;
> #endif
> 
> This is because, Pl080 handle the channel as a char *(name) and pl330
> expect the channel to be enum (a number).

The alternative is that you do as the Primecell drivers do (which was
designed from the outset to be independent of the specific dmaengine),
and pass the DMA filter parameters as pointers via platform data.