linux-kernel - Re: [PATCH 01/24] dt-bindings: mediatek: mt8195: Add binding for MM IOMMU

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Message-ID: <41809d87-0f1b-13fd-b565-26a17626aad9@canonical.com>
Date:   Wed, 30 Jun 2021 08:26:33 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Yong Wu <yong.wu@...iatek.com>, Joerg Roedel <joro@...tes.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>
Cc:     Evan Green <evgreen@...omium.org>, Tomasz Figa <tfiga@...gle.com>,
        Tomasz Figa <tfiga@...omium.org>,
        linux-mediatek@...ts.infradead.org, srv_heupstream@...iatek.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, youlin.pei@...iatek.com,
        Nicolas Boichat <drinkcat@...omium.org>, anan.sun@...iatek.com,
        chao.hao@...iatek.com
Subject: Re: [PATCH 01/24] dt-bindings: mediatek: mt8195: Add binding for MM
 IOMMU

On 30/06/2021 04:34, Yong Wu wrote:
> This patch adds descriptions for mt8195 IOMMU which also use ARM
> Short-Descriptor translation table format.
> 
> In mt8195, 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    ...
> 
> Another change is that we have a new IOMMU that is for infra master like
> PCIe and USB. The infra master don't have the larb and ports, thus we
> rename the port header file to mt8195-memory-port.h rather than
> mt8195-larb-port.h.
> 
> Also, the IOMMU is not only for MM, thus, we don't call it "m4u" which
> means "MultiMedia Memory Management UNIT". thus, use the "iommu" as the
> compatiable string.
> 
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> ---
>  .../bindings/iommu/mediatek,iommu.yaml        |   7 +
>  .../dt-bindings/memory/mt8195-memory-port.h   | 390 ++++++++++++++++++
>  2 files changed, 397 insertions(+)
>  create mode 100644 include/dt-bindings/memory/mt8195-memory-port.h
> 

I understand this will go through IOMMU tree. Do you know about any
further patches for memory controllers which will need the header?

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>


Best regards,
Krzysztof