On Sun, 5 Jan 2020 18:45:05 +0800, Chao Hao wrote:

This patch adds description for MT6779 IOMMU.

MT6779 has two iommus, they are MM_IOMMU and APU_IOMMU which
use ARM Short-Descriptor translation format.

The MT6779 IOMMU hardware diagram is as below, it is only a brief
diagram about iommu, it don't focus on the part of smi_larb, so
I don't describe the smi_larb detailedly.

			     EMI
			      |
	   --------------------------------------
	   |					|
        MM_IOMMU                            APU_IOMMU
	   |					|
       SMI_COMMOM-----------		     APU_BUS
          |		   |			|
    SMI_LARB(0~11)  SMI_LARB12(FAKE)	    SMI_LARB13(FAKE)
	  |		   |			|
	  |		   |		   --------------
	  |		   |		   |	 |	|
   Multimedia engine	  CCU		  VPU   MDLA   EMDA

All the connections are hardware fixed, software can not adjust it.

quoted

From the diagram above, MM_IOMMU provides mapping for multimedia engine,

but CCU is connected with smi_common directly, we can take them as larb12.
APU_IOMMU provides mapping for APU engine, we can take them larb13.
Larb12 and Larb13 are fake larbs.

Signed-off-by: Chao Hao <redacted>
---
 .../bindings/iommu/mediatek,iommu.txt         |   2 +
 include/dt-bindings/memory/mt6779-larb-port.h | 215 ++++++++++++++++++
 2 files changed, 217 insertions(+)
 create mode 100644 include/dt-bindings/memory/mt6779-larb-port.h

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