linux-kernel - Re: [PATCH v4 05/24] dt-bindings: mediatek: Add binding for mt8192 IOMMU

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Message-ID: <1605148902.26323.126.camel@mhfsdcap03>
Date:   Thu, 12 Nov 2020 10:41:42 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
CC:     Joerg Roedel <joro@...tes.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Evan Green <evgreen@...omium.org>,
        Tomasz Figa <tfiga@...gle.com>,
        <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>,
        Greg Kroah-Hartman <gregkh@...gle.com>,
        <kernel-team@...roid.com>
Subject: Re: [PATCH v4 05/24] dt-bindings: mediatek: Add binding for mt8192
 IOMMU

Hi Krzysztof,

On Wed, 2020-11-11 at 22:33 +0100, Krzysztof Kozlowski wrote:
> On Wed, Nov 11, 2020 at 08:38:19PM +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>
> > Reviewed-by: Rob Herring <robh@...nel.org>
> > ---

[...]

> > +#ifndef _DTS_IOMMU_PORT_MT8192_H_
> > +#define _DTS_IOMMU_PORT_MT8192_H_
> 
> Not accurate header guard. Shoud be:
> _DT_BINDINGS_MEMORY_MT8192_LARB_PORT_H_
> 
> Probably you copied it from some other Mediatek headers - all of them
> have header guard pointing to different directory.

Thanks very much for your reviewing so many patches.

This name like this when it was in the first version. Since it is only
used when the consumer devices enable IOMMU, thus called it
_IOMMU_PORT...

I will use a new patch to rename all of them.

> 
> Best regards,
> Krzysztof