linux-kernel - Re: [PATCH v4 04/24] dt-bindings: memory: mediatek: Add domain definition

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Message-ID: <20201116174401.GA1861980@bogus>
Date:   Mon, 16 Nov 2020 11:44:01 -0600
From:   Rob Herring <robh@...nel.org>
To:     Yong Wu <yong.wu@...iatek.com>
Cc:     Rob Herring <robh+dt@...nel.org>, youlin.pei@...iatek.com,
        Krzysztof Kozlowski <krzk@...nel.org>,
        devicetree@...r.kernel.org,
        Nicolas Boichat <drinkcat@...omium.org>,
        Tomasz Figa <tfiga@...gle.com>,
        Evan Green <evgreen@...omium.org>, anan.sun@...iatek.com,
        iommu@...ts.linux-foundation.org, Joerg Roedel <joro@...tes.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        chao.hao@...iatek.com, Will Deacon <will@...nel.org>,
        Greg Kroah-Hartman <gregkh@...gle.com>,
        srv_heupstream@...iatek.com, kernel-team@...roid.com,
        Robin Murphy <robin.murphy@....com>,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 04/24] dt-bindings: memory: mediatek: Add domain
 definition

On Wed, 11 Nov 2020 20:38:18 +0800, Yong Wu wrote:
> In the latest SoC, there are several HW IP require a sepecial iova
> range, mainly CCU and VPU has this requirement. Take CCU as a example,
> CCU require its iova locate in the range(0x4000_0000 ~ 0x43ff_ffff).
> 
> In this patch we add a domain definition for the special port. In the
> example of CCU, If we preassign CCU port in domain1, then iommu driver
> will prepare a independent iommu domain of the special iova range for it,
> then the iova got from dma_alloc_attrs(ccu-dev) will locate in its special
> range.
> 
> This is a preparing patch for multi-domain support.
> 
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> ---
>  include/dt-bindings/memory/mtk-smi-larb-port.h | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 

Acked-by: Rob Herring <robh@...nel.org>