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 <[email protected]>
Signed-off-by: Irui Wang <[email protected]>
---
Documentation/devicetree/bindings/media/mediatek-vcodec.txt | 1 +
1 file changed, 1 insertion(+)
diff --git a/Documentation/devicetree/bindings/media/mediatek-vcodec.txt b/Documentation/devicetree/bindings/media/mediatek-vcodec.txt
index 06db6837cefd..5bb9e6e191b7 100644
--- a/Documentation/devicetree/bindings/media/mediatek-vcodec.txt
+++ b/Documentation/devicetree/bindings/media/mediatek-vcodec.txt
@@ -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.
--
2.18.0