Re: [alsa-devel] [PATCH 1/7 v2] dmaengine: add a simple dma library

On Thu, 2012-01-26 at 15:56 +0100, Guennadi Liakhovetski wrote:

This patch adds a library of functions, helping to implement dmaengine drivers for hardware, unable to handle scatter-gather lists natively. The first version of this driver only supports memcpy and slave DMA operation.

Signed-off-by: Guennadi Liakhovetski g.liakhovetski@gmx.de

v2:

1. switch from using a tasklet to threaded IRQ, which allowed to
2. remove lock / unlock inline functions
3. remove __devinit, __devexit annotations

Sorry to join the discussion late, was on vacation, travel, long weekend...

I don't still comprehend the need for a library on top of dmaengine which gain is just a library between clients and dmacs. Surely we don't want to write another abstraction on top of one provided?

If the question is to handle scatter-gather even if the hardware doesn't have the capability, then why don't add that in dmaengine itself rather than one more layer?