linux-kernel - Re: [PATCH 08/10] arm64: dts: mt8195: Add dma-ranges for the parent "soc" node

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Message-ID: <6aa2d375-144f-c66d-0bf9-24d9f8226907@collabora.com>
Date:   Mon, 16 Jan 2023 10:47:26 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Yong Wu <yong.wu@...iatek.com>, Joerg Roedel <joro@...tes.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Hans Verkuil <hverkuil@...all.nl>, nfraprado@...labora.com,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        iommu@...ts.linux.dev, mingyuan.ma@...iatek.com,
        yf.wang@...iatek.com, libo.kang@...iatek.com,
        Yunfei Dong <yunfei.dong@...iatek.com>,
        kyrie wu <kyrie.wu@...iatek.corp-partner.google.com>,
        chengci.xu@...iatek.com, youlin.pei@...iatek.com,
        anan.sun@...iatek.com
Subject: Re: [PATCH 08/10] arm64: dts: mt8195: Add dma-ranges for the parent
 "soc" node

Il 13/01/23 07:01, Yong Wu ha scritto:
> After commit f1ad5338a4d5 ("of: Fix "dma-ranges" handling for bus
> controllers"), the dma-ranges property is not allowed for
> the leaf node. But our iommu/dma-ranges is 16GB, we still expect
> separate the 16GB dma-range like:
> a) display is in 0 - 4GB;
> b) vcodec is in 4GB - 8GB;
> c) camera is in 8GB - 12GB.
> We can not expect all the masters add a parent node for them,
> especial for the existed drivers/nodes.
> Thus, we add whole the 16GB dma-ranges in the parent "soc" node.
> 
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>