Messages in this thread Patch in this message | | | From | Irui Wang <> | Subject | [PATCH v2,1/5] dt-bindings: media: mtk-vcodec: Add dma-ranges property | Date | Fri, 12 Mar 2021 15:55:38 +0800 |
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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.
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.
Signed-off-by: Irui Wang <irui.wang@mediatek.com> --- Documentation/devicetree/bindings/media/mediatek-vcodec.txt | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/Documentation/devicetree/bindings/media/mediatek-vcodec.txt b/Documentation/devicetree/bindings/media/mediatek-vcodec.txt index 8318f0ed492d..d852683d3e6f 100644 --- a/Documentation/devicetree/bindings/media/mediatek-vcodec.txt +++ b/Documentation/devicetree/bindings/media/mediatek-vcodec.txt @@ -22,6 +22,8 @@ Required properties: - iommus : should point to the respective IOMMU block with master port as argument, see Documentation/devicetree/bindings/iommu/mediatek,iommu.txt for details. +- dma-ranges : describes how the physical address space of the IOMMU maps + to memory. 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. -- 2.18.0
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