Subject: [PATCH 1/2] arm: msm: Add System MMU support.

From: [email-masked] (Benjamin Herrenschmidt)
Date: Sat, 31 Jul 2010 12:30:49 +1000

On Thu, 2010-07-29 at 12:35 +0900, FUJITA Tomonori wrote:
> Don't confuse the IOMMU interface with the DMA API that Arnd
> mentioned.
> 
> They are not related at all.
> 
> The DMA API is defined in Documentation/DMA-API.txt.
> 
> Arnd told you that include/asm-generic/dma-mapping-common.h is the
> library to support the DMA API with multiple IOMMUs. Lots of
> architectures (x86, powerpc, sh, alpha, ia64, microblaze, sparc)
> use it. 

Also, some of the iommu layer actually originates from powerpc.

Cheers,
Ben.