linux-kernel - Re: [PATCH v3 1/3] dt-bindings: mediatek: mt8188: Add binding for MM & INFRA IOMMU

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Date:   Mon, 19 Sep 2022 13:05:16 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     "Chengci.Xu" <chengci.xu@...iatek.com>,
        Yong Wu <yong.wu@...iatek.com>, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     iommu@...ts.linux.dev, linux-mediatek@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v3 1/3] dt-bindings: mediatek: mt8188: Add binding for MM
 & INFRA IOMMU

On 19/09/2022 10:26, Chengci.Xu wrote:
> Adds descriptions for mt8188 IOMMU which also use ARM Short-Descriptor
> translation table format.
> 
> In mt8188, there are two smi-common HW and IOMMU, one is for vdo(video
> output), the other is for vpp(video processing pipe). They connects
> with different smi-larbs, then some setting(larbid_remap) is different.
> Differentiate them with the compatible string.
> 
> Something like this:
> 
>   IOMMU(VDO)          IOMMU(VPP)
>       |                   |
> SMI_COMMON_VDO      SMI_COMMON_VPP
> ---------------     ----------------
>   |     |    ...      |     |    ...
> larb0 larb2  ...    larb1 larb3  ...
> 
> We also have an IOMMU that is for infra master like PCIe.
> And infra master don't have the larb and ports.
> 
> Signed-off-by: Chengci.Xu <chengci.xu@...iatek.com>


Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>


Best regards,
Krzysztof