linux-kernel - Re: [PATCH 01/21] dt-binding: memory: mediatek: Add a common larb-port header file

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Date:   Mon, 13 Jul 2020 14:28:04 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Pi-Hsun Shih <pihsun@...omium.org>
CC:     Matthias Brugger <matthias.bgg@...il.com>,
        Joerg Roedel <joro@...tes.org>,
        Rob Herring <robh+dt@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Will Deacon <will@...nel.org>,
        Evan Green <evgreen@...omium.org>,
        Tomasz Figa <tfiga@...gle.com>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        <iommu@...ts.linux-foundation.org>,
        Youlin Pei (裴友林) 
        <youlin.pei@...iatek.com>, Nicolas Boichat <drinkcat@...omium.org>,
        <anan.sun@...iatek.com>, <cui.zhang@...iatek.com>,
        <chao.hao@...iatek.com>, <ming-fan.chen@...iatek.com>
Subject: Re: [PATCH 01/21] dt-binding: memory: mediatek: Add a common
 larb-port header file

On Mon, 2020-07-13 at 13:43 +0800, Pi-Hsun Shih wrote:
> On Mon, Jul 13, 2020 at 2:06 AM Matthias Brugger <matthias.bgg@...il.com> wrote:
> >
> >
> >
> > On 11/07/2020 08:48, Yong Wu wrote:
> > > Put all the macros about smi larb/port togethers, this is a preparing
> > > patch for extending LARB_NR and adding new dom-id support.
> > >
> > > Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> > > ---
> > >   include/dt-bindings/memory/mt2712-larb-port.h  |  2 +-
> > >   include/dt-bindings/memory/mt6779-larb-port.h  |  2 +-
> > >   include/dt-bindings/memory/mt8173-larb-port.h  |  2 +-
> > >   include/dt-bindings/memory/mt8183-larb-port.h  |  2 +-
> > >   include/dt-bindings/memory/mtk-smi-larb-port.h | 15 +++++++++++++++
> > >   5 files changed, 19 insertions(+), 4 deletions(-)
> > >   create mode 100644 include/dt-bindings/memory/mtk-smi-larb-port.h
> > >
> > > ...
> > > diff --git a/include/dt-bindings/memory/mtk-smi-larb-port.h b/include/dt-bindings/memory/mtk-smi-larb-port.h
> > > new file mode 100644
> > > index 000000000000..2ec7fe5ce4e9
> > > --- /dev/null
> > > +++ b/include/dt-bindings/memory/mtk-smi-larb-port.h
> > > @@ -0,0 +1,15 @@
> > > +/* SPDX-License-Identifier: GPL-2.0-only */
> > > +/*
> > > + * Copyright (c) 2020 MediaTek Inc.
> > > + * Author: Yong Wu <yong.wu@...iatek.com>
> > > + */
> > > +#ifndef __DTS_MTK_IOMMU_PORT_H_
> > > +#define __DTS_MTK_IOMMU_PORT_H_
> > > +
> > > +#define MTK_LARB_NR_MAX                      16
> >
> > include/soc/mediatek/smi.h has the very same define.
> > Should smi.h include this file?
> >
> > Regards,
> > Matthias
> >
> 
> Looks like this is being addressed in patch 5 in this series ([05/21]
> iommu/mediatek: Use the common mtk-smi-larb-port.h)
> That said, should that patch be merged into this one?

At the beginning, I really did like this. But checkpatch will complain
like that:

WARNING:DT_SPLIT_BINDING_PATCH: DT binding docs and includes should be a
separate patch. See:
Documentation/devicetree/bindings/submitting-patches.rst

> 
> 
> 
> > > +
> > > +#define MTK_M4U_ID(larb, port)               (((larb) << 5) | (port))
> > > +#define MTK_M4U_TO_LARB(id)          (((id) >> 5) & 0xf)
> > > +#define MTK_M4U_TO_PORT(id)          ((id) & 0x1f)
> > > +
> > > +#endif
> > >