diff mbox series

[v5,2/6] dt-bindings: media: mtk-vcodec: Add dma-ranges property

Message ID 20210605022918.4213-3-irui.wang@mediatek.com
State Accepted
Commit 5cd57605771216755bd6f98748d4f11d1e65b780
Headers show
Series Support H264 4K on MT8192 | expand

Commit Message

Irui Wang June 5, 2021, 2:29 a.m. UTC 
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>
---
 Documentation/devicetree/bindings/media/mediatek-vcodec.txt | 1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

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.