linux-kernel - Re: [PATCH v2 01/19] dt-bindings: mediatek: Add bindings for MT6779

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Date:   Tue, 7 Jan 2020 19:10:59 +0800
From:   chao hao <Chao.Hao@...iatek.com>
To:     Rob Herring <robh@...nel.org>
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>,
        Yong Wu <yong.wu@...iatek.com>,
        Anan Sun <anan.sun@...iatek.com>,
        Chao Hao <chao.hao@...iatek.com>
Subject: Re: [PATCH v2 01/19] dt-bindings: mediatek: Add bindings for MT6779

On Mon, 2020-01-06 at 15:57 -0600, Rob Herring wrote:
> On Sun, 5 Jan 2020 18:45:05 +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 | 215 ++++++++++++++++++
> >  2 files changed, 217 insertions(+)
> >  create mode 100644 include/dt-bindings/memory/mt6779-larb-port.h
> > 
> 
> Please add Acked-by/Reviewed-by tags when posting new versions. However,
> there's no need to repost patches *only* to add the tags. The upstream
> maintainer will do that for acks received on the version they apply.
> 
> If a tag was not added on purpose, please state why and what changed.

Hi Rob,

I am Sorry, this is my first time upstream and not clear for some
details, please forgive me for this mistake.
I put the changed explanation into cover letter([PATCH v2 00/19] MT6779
IOMMU SUPPORT) about this patch. I will pay attention to this problem in
next version.

Change since v1 for this patch
1.Delete M4U_PORT_UNKNOWN define because of not use it.
2.Correct coding format: ex: /*larb3-VENC*/  -->  /* larb3-VENC */