linux-kernel - Re: [RESEND,PATCH 01/13] dt-bindings: mediatek: Add bindings for MT6779

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Message-ID: <20191106234020.GA19463@bogus>
Date:   Wed, 6 Nov 2019 17:40:20 -0600
From:   Rob Herring <robh@...nel.org>
To:     Chao Hao <chao.hao@...iatek.com>
Cc:     Joerg Roedel <joro@...tes.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        iommu@...ts.linux-foundation.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, wsd_upstream@...iatek.com,
        Jun Yan <jun.yan@...iatek.com>,
        Cui Zhang <cui.zhang@...iatek.com>,
        Guangming Cao <guangming.cao@...iatek.com>,
        Yong Wu <yong.wu@...iatek.com>,
        Anan Sun <anan.sun@...iatek.com>,
        Miles Chen <miles.chen@...iatek.com>,
        Chao Hao <chao.hao@...iatek.com>
Subject: Re: [RESEND,PATCH 01/13] dt-bindings: mediatek: Add bindings for
 MT6779

On Mon, 4 Nov 2019 19:52:26 +0800, Chao Hao wrote:
> This patch adds description for MT6779 IOMMU.
> 
> MT6779 has two iommus, they are MM_IOMMU and APU_IOMMU which
> use ARM Short-Descriptor translation format.
> 
> The MT6779 IOMMU hardware diagram is as below, it is only a brief
> diagram about iommu, it don't focus on the part of smi_larb, so
> I don't describe the smi_larb detailedly.
> 
> 			     EMI
> 			      |
> 	   --------------------------------------
> 	   |					|
>         MM_IOMMU                            APU_IOMMU
> 	   |					|
>        SMI_COMMOM-----------		     APU_BUS
>           |		   |			|
>     SMI_LARB(0~11)  SMI_LARB12(FAKE)	    SMI_LARB13(FAKE)
> 	  |		   |			|
> 	  |		   |		   --------------
> 	  |		   |		   |	 |	|
>    Multimedia engine	  CCU		  VPU   MDLA   EMDA
> 
> All the connections are hardware fixed, software can not adjust it.
> 
> >From the diagram above, MM_IOMMU provides mapping for multimedia engine,
> but CCU is connected with smi_common directly, we can take them as larb12.
> APU_IOMMU provides mapping for APU engine, we can take them larb13.
> Larb12 and Larb13 are fake larbs.
> 
> Signed-off-by: Chao Hao <chao.hao@...iatek.com>
> ---
>  .../bindings/iommu/mediatek,iommu.txt         |   2 +
>  include/dt-bindings/memory/mt6779-larb-port.h | 217 ++++++++++++++++++
>  2 files changed, 219 insertions(+)
>  create mode 100644 include/dt-bindings/memory/mt6779-larb-port.h
> 

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