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

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Message-ID: <20210602185017.GA3763804@robh.at.kernel.org>
Date:   Wed, 2 Jun 2021 13:50:17 -0500
From:   Rob Herring <robh@...nel.org>
To:     Irui Wang <irui.wang@...iatek.com>
Cc:     Tiffany Lin <tiffany.lin@...iatek.com>,
        Maoguang Meng <maoguang.meng@...iatek.com>,
        Alexandre Courbot <acourbot@...omium.org>,
        linux-media@...r.kernel.org,
        Longfei Wang <longfei.wang@...iatek.com>,
        Yong Wu <yong.wu@...iatek.com>,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        Tomasz Figa <tfiga@...gle.com>,
        linux-mediatek@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        devicetree@...r.kernel.org,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Tzung-Bi Shih <tzungbi@...omium.org>,
        Fritz Koenig <frkoenig@...omium.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        srv_heupstream@...iatek.com, linux-arm-kernel@...ts.infradead.org,
        Yunfei Dong <yunfei.dong@...iatek.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4,2/6] dt-bindings: media: mtk-vcodec: Add dma-ranges
 property

On Fri, 21 May 2021 15:01:35 +0800, Irui Wang wrote:
> 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(+)
> 

Acked-by: Rob Herring <robh@...nel.org>