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Commit c31e74c4c34fa863393c28b95409aee934b4f8e1

Authored by FUJITA Tomonori
Committed by Linus Torvalds
1 parent 3b9c6c11f5
Exists in master and in 7 other branches imx_3.0.35_4.1.0, imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga, smarc-l5.0.0_1.0.0-ga

Documentation: DMA-API-HOWTO.txt: add multiple types of IOMMUs support 

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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Documentation/DMA-API-HOWTO.txt
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... ... @@ -753,6 +753,16 @@
753 753 alignment constraints (e.g. the alignment constraints about 64-bit
754 754 objects).
755 755  
  756 +3) Supporting multiple types of IOMMUs
  757 +
  758 + If your architecture needs to support multiple types of IOMMUs, you
  759 + can use include/linux/asm-generic/dma-mapping-common.h. It's a
  760 + library to support the DMA API with multiple types of IOMMUs. Lots
  761 + of architectures (x86, powerpc, sh, alpha, ia64, microblaze and
  762 + sparc) use it. Choose one to see how it can be used. If you need to
  763 + support multiple types of IOMMUs in a single system, the example of
  764 + x86 or powerpc helps.
  765 +
756 766 Closing
757 767  
758 768 This document, and the API itself, would not be in its current