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media: dt-bindings: media: mtk-vcodec: Add dma-ranges property

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The mt8192 iommu support 0~16GB iova. We separate it to four banks:
0~4G; 4G~8G; 8G~12G; 12G~16G.

The "dma-ranges" could be used to adjust the bank we locate.
If we don't set this property. The default range always is 0~4G.

This is optional and only needed in mt8192, the dma ranges should
not cross 4G/8G/12G.

Here we don't have actual bus/parent concept here.  And the iova
requirement is for our HW. Thus put the property in our node.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Irui Wang <irui.wang@mediatek.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Irui Wang 2021-06-05 04:29:14 +02:00 committed by Mauro Carvalho Chehab
parent b6c57d313f
commit 5cd5760577
1 changed files with 1 additions and 0 deletions
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Documentation/devicetree/bindings/media/mediatek-vcodec.txt
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@ -22,6 +22,7 @@ Required properties:
- iommus : should point to the respective IOMMU block with master port as
argument, see Documentation/devicetree/bindings/iommu/mediatek,iommu.yaml
for details.
- dma-ranges : describes the dma address range space that the codec hw access.
One of the two following nodes:
- mediatek,vpu : the node of the video processor unit, if using VPU.
- mediatek,scp : the node of the SCP unit, if using SCP.