linux-kernel - Re: [PATCH 1/3] dt-bindings: iommu: mediatek: add binding documentation for MT8365 SoC

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Date:   Thu, 2 Jun 2022 17:26:19 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Macpaul Lin <macpaul.lin@...iatek.com>,
        Fabien Parent <fparent@...libre.com>
CC:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        "Rob Herring" <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <iommu@...ts.linux-foundation.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        "Bear Wang" <bear.wang@...iatek.com>,
        Macross Chen <macross.chen@...iatek.com>,
        Kidd-KW Chen <Kidd-KW.Chen@...iatek.com>,
        Andy Hsieh <Andy.Hsieh@...iatek.com>,
        Pablo Sun <pablo.sun@...iatek.com>
Subject: Re: [PATCH 1/3] dt-bindings: iommu: mediatek: add binding
 documentation for MT8365 SoC

On Thu, 2022-06-02 at 16:42 +0800, Macpaul Lin wrote:
> On 6/2/22 4:27 PM, Macpaul Lin wrote:
> > On 6/2/22 2:18 PM, Yong Wu wrote:
> > > On Mon, 2022-05-30 at 20:03 +0200, Fabien Parent wrote:
> > > > Add IOMMU binding documentation for the MT8365 SoC.
> > > > 
> > > > Signed-off-by: Fabien Parent <fparent@...libre.com>
> > > > ---
> > > >   .../bindings/iommu/mediatek,iommu.yaml        |  2 +
> > > >   include/dt-bindings/memory/mt8365-larb-port.h | 96
> > > > +++++++++++++++++++
> > > >   2 files changed, 98 insertions(+)
> > > >   create mode 100644 include/dt-bindings/memory/mt8365-larb-
> > > > port.h
> > > 
> > > [snip...]
> > > 
> > > > +#ifndef _DT_BINDINGS_MEMORY_MT8365_LARB_PORT_H_
> > > > +#define _DT_BINDINGS_MEMORY_MT8365_LARB_PORT_H_
> > > > +
> > > > +#include <dt-bindings/memory/mtk-memory-port.h>
> > > > +
> > > > +#define M4U_LARB0_ID            0
> > > > +#define M4U_LARB1_ID            1
> > > > +#define M4U_LARB2_ID            2
> > > > +#define M4U_LARB3_ID            3
> > > > +#define M4U_LARB4_ID            4
> > > > +#define M4U_LARB5_ID            5
> > > > +#define M4U_LARB6_ID            6
> > > > +#define M4U_LARB7_ID            7
> > > 
> > > Remove these. they are no used, right?
> > 
> > AIOT and customers are using the modules and their related IOMMU
> > modules.
> > DISP0, VENC, VDEC, ISP (CAMSYS), and APU (as far as I know, which
> > should 
> > be VP6?) were all supported.
> 
> Dear Yong,
> How about to replace the following definitions?
> 
> For example, replace
> #define M4U_PORT_DISP_OVL0		MTK_M4U_ID(0, 0)
> to
> #define M4U_PORT_DISP_OVL0              MTK_M4U_ID(M4U_LARB0_ID , 0)

Yes. It is ok.

> 
> > > 
> > > > +
> > > > +/* larb0 */
> > > > +#define M4U_PORT_DISP_OVL0        MTK_M4U_ID(0, 0)
> > > > +#define M4U_PORT_DISP_OVL0_2L    MTK_M4U_ID(0, 1)
> > > 
> > > [...]
> > > 
> > > > 
> > > > +/* larb4 */
> > > > +#define M4U_PORT_APU_READ        MTK_M4U_ID(0, 0)
> > > > +#define M4U_PORT_APU_WRITE        MTK_M4U_ID(0, 1)
> > > 
> > > Please remove these two APU definitions. currently these are not
> > > supported.
> > 
> > Kidd, please help to check if APU use these definitions with Yong.
> > However, I think these are all available to the customers.
> > 
> > Thanks
> > Macpaul Lin
> 
> Thanks
> Macpaul Lin