linux-kernel - Re: [PATCH v4 1/4] dt-bindings: mediatek: mt8188: Add binding for MM & INFRA IOMMU

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Date:   Mon, 21 Nov 2022 05:17:08 +0000
From:   Yong Wu (吴勇) <Yong.Wu@...iatek.com>
To:     "robin.murphy@....com" <robin.murphy@....com>,
        "joro@...tes.org" <joro@...tes.org>,
        "will@...nel.org" <will@...nel.org>,
        Chengci Xu (许承赐) 
        <Chengci.Xu@...iatek.com>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>
CC:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "krzysztof.kozlowski@...aro.org" <krzysztof.kozlowski@...aro.org>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v4 1/4] dt-bindings: mediatek: mt8188: Add binding for MM
 & INFRA IOMMU

On Tue, 2022-10-18 at 14:42 +0800, 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>
> ---
>  .../bindings/iommu/mediatek,iommu.yaml        |  12 +-
>  .../memory/mediatek,mt8188-memory-port.h      | 482
> ++++++++++++++++++

Reviewed-by: Yong Wu <yong.wu@...iatek.com>