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

[AngeloGioacchino Del Regno]

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 at mediatek.com>
>>> Signed-off-by: Yong Wu <yong.wu at mediatek.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.

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},
>>
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>