linux-kernel - Re: [PATCH 2/2] iommu/mediatek: Add mt8186 iommu support

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Message-ID: <8b63983222a4a304586a7b880379fcf4a7036c4a.camel@mediatek.com>
Date:   Fri, 18 Feb 2022 11:32:43 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
CC:     Robin Murphy <robin.murphy@....com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Tomasz Figa <tfiga@...omium.org>,
        <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>,
        Hsin-Yi Wang <hsinyi@...omium.org>, <youlin.pei@...iatek.com>,
        <anan.sun@...iatek.com>, <xueqi.zhang@...iatek.com>,
        <yen-chang.chen@...iatek.com>, <mingyuan.ma@...iatek.com>,
        <yf.wang@...iatek.com>, <libo.kang@...iatek.com>,
        <chengci.xu@...iatek.com>, Joerg Roedel <joro@...tes.org>,
        Rob Herring <robh+dt@...nel.org>,
        "Matthias Brugger" <matthias.bgg@...il.com>,
        Will Deacon <will@...nel.org>
Subject: Re: [PATCH 2/2] iommu/mediatek: Add mt8186 iommu support

On Mon, 2022-01-31 at 10:25 +0100, AngeloGioacchino Del Regno wrote:
> Il 28/01/22 10:39, Yong Wu ha scritto:
> > On Thu, 2022-01-27 at 12:28 +0100, AngeloGioacchino Del Regno
> > wrote:
> > > Il 25/01/22 10:32, Yong Wu ha scritto:
> > > > Add mt8186 iommu supports.
> > > > 
> > > > Signed-off-by: Anan Sun <anan.sun@...iatek.com>
> > > > Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> > > > ---
> > > >    drivers/iommu/mtk_iommu.c | 17 +++++++++++++++++
> > > >    1 file changed, 17 insertions(+)
> > 
> > [snip]
> > 
> > > >    static const struct mtk_iommu_plat_data mt8192_data = {
> > > >    	.m4u_plat       = M4U_MT8192,
> > > >    	.flags          = HAS_BCLK | HAS_SUB_COMM_2BITS |
> > > > OUT_ORDER_WR_EN |
> > > > @@ -1470,6 +1486,7 @@ static const struct of_device_id
> > > > mtk_iommu_of_ids[] = {
> > > >    	{ .compatible = "mediatek,mt8167-m4u", .data =
> > > > &mt8167_data},
> > > >    	{ .compatible = "mediatek,mt8173-m4u", .data =
> > > > &mt8173_data},
> > > >    	{ .compatible = "mediatek,mt8183-m4u", .data =
> > > > &mt8183_data},
> > > > +	{ .compatible = "mediatek,mt8186-iommu-mm", .data =
> > > > &mt8186_data_mm},
> > > 
> > > Hello!
> > > 
> > > Is there any particular reason why this compatible is not
> > > "mediatek,mt8186-m4u"?
> > 
> > There is no special reason. In the previous SoC, We only support MM
> > IOMMU, it was called by "m4u". In the lastest SoC, We have the
> > other
> > types IOMMU, like for INFRA masters and APU, thus they are called
> > "mm
> > iommu", "infra iommu" and "apu iommu". Of course, "m4u" means "mm
> > iommu".
> > 
> 
> I suggest, at this point, to change it to "mediatek,mt8186-m4u" for
> naming
> consistency with the other bindings and to avoid any kind of
> confusion.

Understand. But we don't call it "m4u" anymore. I'd not like to use a
outdated name. For readable, I could add a comment like this:

{ .compatible = "mediatek,mt8186-iommu-mm", xx}, /* iommu-mm: m4u */

Is this ok for you?
Thanks.

> Thank you!
> 
> > > 
> > > Thanks,
> > > Angelo
> > > 
> > > >    	{ .compatible = "mediatek,mt8192-m4u", .data =
> > > > &mt8192_data},
> > > >    	{ .compatible = "mediatek,mt8195-iommu-infra", .data =
> > > > &mt8195_data_infra},
> > > >    	{ .compatible = "mediatek,mt8195-iommu-vdo",   .data =
> > > > &mt8195_data_vdo},
> > > 
> > > _______________________________________________
> > > Linux-mediatek mailing list
> > > Linux-mediatek@...ts.infradead.org
> > > http://lists.infradead.org/mailman/listinfo/linux-mediatek
> 
> 

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