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

[Yong Wu]

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@xxxxxxxxxxxx>
> > Signed-off-by: Yong Wu <yong.wu@xxxxxxxxxxxx>
> > ---
> >   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".

> 
> 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},
> 
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