linux-kernel - Re: [PATCH v7 1/6] dt-bindings: mediatek: mt8188: Add binding for MM & INFRA IOMMU

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Message-ID: <08b993f9-f998-14c8-221a-a0b80ac5d342@linaro.org>
Date:   Fri, 17 Feb 2023 10:23:34 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Yong Wu <yong.wu@...iatek.com>, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     Robin Murphy <robin.murphy@....com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, iommu@...ts.linux.dev,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        mingyuan.ma@...iatek.com, yf.wang@...iatek.com,
        jianjiao.zeng@...iatek.com, chengci.xu@...iatek.com,
        youlin.pei@...iatek.com
Subject: Re: [PATCH v7 1/6] dt-bindings: mediatek: mt8188: Add binding for MM
 & INFRA IOMMU

On 16/02/2023 06:33, Yong Wu wrote:
> From: "Chengci.Xu" <chengci.xu@...iatek.com>
> 
> Add 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>
> Reviewed-by: Yong Wu <yong.wu@...iatek.com>
> ---
> Hi Krzysztof,
> I added some comment about larbid index, this is for readable when
> adding iova_region_larb_msk in the code.
> I'm not sure if it is ok for you, thus don't keep your A-b currently.
> Thanks.
> ---
>  .../bindings/iommu/mediatek,iommu.yaml        |  12 +-
>  .../memory/mediatek,mt8188-memory-port.h      | 489 ++++++++++++++++++
>  2 files changed, 500 insertions(+), 1 deletion(-)


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

Best regards,
Krzysztof