linux-kernel - Re: [PATCH v2 06/23] dt-bindings: mediatek: Add binding for mt8192 IOMMU and SMI

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Date:   Mon, 14 Sep 2020 18:42:45 -0600
From:   Rob Herring <robh@...nel.org>
To:     Yong Wu <yong.wu@...iatek.com>
Cc:     linux-mediatek@...ts.infradead.org,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        Will Deacon <will@...nel.org>,
        iommu@...ts.linux-foundation.org, Tomasz Figa <tfiga@...gle.com>,
        srv_heupstream@...iatek.com, devicetree@...r.kernel.org,
        Robin Murphy <robin.murphy@....com>,
        Evan Green <evgreen@...omium.org>,
        Rob Herring <robh+dt@...nel.org>,
        Joerg Roedel <joro@...tes.org>, chao.hao@...iatek.com,
        Nicolas Boichat <drinkcat@...omium.org>,
        linux-kernel@...r.kernel.org, anan.sun@...iatek.com,
        ming-fan.chen@...iatek.com, youlin.pei@...iatek.com
Subject: Re: [PATCH v2 06/23] dt-bindings: mediatek: Add binding for mt8192
 IOMMU and SMI

On Sat, 05 Sep 2020 16:09:03 +0800, Yong Wu wrote:
> This patch adds decriptions for mt8192 IOMMU and SMI.
> 
> mt8192 also is MTK IOMMU gen2 which uses ARM Short-Descriptor translation
> table format. The M4U-SMI HW diagram is as below:
> 
>                           EMI
>                            |
>                           M4U
>                            |
>                       ------------
>                        SMI Common
>                       ------------
>                            |
>   +-------+------+------+----------------------+-------+
>   |       |      |      |       ......         |       |
>   |       |      |      |                      |       |
> larb0   larb1  larb2  larb4     ......      larb19   larb20
> disp0   disp1   mdp    vdec                   IPE      IPE
> 
> All the connections are HW fixed, SW can NOT adjust it.
> 
> mt8192 M4U support 0~16GB iova range. we preassign different engines
> into different iova ranges:
> 
> domain-id  module     iova-range                  larbs
>    0       disp        0 ~ 4G                      larb0/1
>    1       vcodec      4G ~ 8G                     larb4/5/7
>    2       cam/mdp     8G ~ 12G             larb2/9/11/13/14/16/17/18/19/20
>    3       CCU0    0x4000_0000 ~ 0x43ff_ffff     larb13: port 9/10
>    4       CCU1    0x4400_0000 ~ 0x47ff_ffff     larb14: port 4/5
> 
> The iova range for CCU0/1(camera control unit) is HW requirement.
> 
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> ---
>  .../bindings/iommu/mediatek,iommu.yaml        |   9 +-
>  .../mediatek,smi-common.yaml                  |   5 +-
>  .../memory-controllers/mediatek,smi-larb.yaml |   3 +-
>  include/dt-bindings/memory/mt8192-larb-port.h | 239 ++++++++++++++++++
>  4 files changed, 251 insertions(+), 5 deletions(-)
>  create mode 100644 include/dt-bindings/memory/mt8192-larb-port.h
> 

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