linux-kernel - Re: [PATCH v3 6/6] iommu: mtk_iommu: Lookup phandle to retrieve syscon to pericfg

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Date:   Mon, 13 Jun 2022 10:13:13 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Yong Wu <yong.wu@...iatek.com>
Cc:     joro@...tes.org, will@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, 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,
        krzysztof.kozlowski@...aro.org
Subject: Re: [PATCH v3 6/6] iommu: mtk_iommu: Lookup phandle to retrieve
 syscon to pericfg

Il 13/06/22 07:32, Yong Wu ha scritto:
> On Thu, 2022-06-09 at 12:08 +0200, AngeloGioacchino Del Regno wrote:
>> On some SoCs (of which only MT8195 is supported at the time of
>> writing),
>> the "R" and "W" (I/O) enable bits for the IOMMUs are in the
>> pericfg_ao
>> register space and not in the IOMMU space: as it happened already
>> with
>> infracfg, it is expected that this list will grow.
> 
> Currently I don't see the list will grow. As commented before, In the
> lastest SoC, The IOMMU enable bits for IOMMU will be in ATF, rather
> than in this pericfg register region. In this case, Is this patch
> unnecessary? or we could add this patch when there are 2 SoCs use this
> setting at least?  what's your opinion?
> 

Perhaps I've misunderstood... besides, can you please check if there's any
other SoC (not just chromebooks, also smartphone SoCs) that need this logic?

Thanks,
Angelo