linux-kernel - [PATCH v4,2/6] dt-bindings: media: mtk-vcodec: Add dma-ranges property

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Date:   Fri, 21 May 2021 15:01:35 +0800
From:   Irui Wang <irui.wang@...iatek.com>
To:     Alexandre Courbot <acourbot@...omium.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Tiffany Lin <tiffany.lin@...iatek.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Tomasz Figa <tfiga@...gle.com>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Maoguang Meng <maoguang.meng@...iatek.com>,
        Longfei Wang <longfei.wang@...iatek.com>,
        Yong Wu <yong.wu@...iatek.com>
CC:     Yunfei Dong <yunfei.dong@...iatek.com>,
        Fritz Koenig <frkoenig@...omium.org>,
        Tzung-Bi Shih <tzungbi@...omium.org>,
        Irui Wang <irui.wang@...iatek.com>,
        <linux-media@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>,
        <linux-mediatek@...ts.infradead.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: [PATCH v4,2/6] dt-bindings: media: mtk-vcodec: Add dma-ranges property

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@...iatek.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 06db6837cefd..b7801e3c354a 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.yaml
   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