linux-kernel - Re: [PATCH v2 3/8] dt-bindings: media: mediatek,jpeg: Relax IOMMU max item count

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Message-ID: <a0bff4b0-53ee-4c72-bc0a-205052cd9985@kernel.org>
Date: Wed, 2 Oct 2024 15:59:10 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Fei Shao <fshao@...omium.org>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: Bin Liu <bin.liu@...iatek.com>, Conor Dooley <conor+dt@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Matthias Brugger <matthias.bgg@...il.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>, Rob Herring <robh@...nel.org>,
 Xia Jiang <xia.jiang@...iatek.com>, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-media@...r.kernel.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 3/8] dt-bindings: media: mediatek,jpeg: Relax IOMMU max
 item count

On 01/10/2024 13:27, Fei Shao wrote:
> On MediaTek platforms with Multimedia MMU (M4U), a multimedia hardware
> can be assigned with a local arbiter (LARB) which has a maximum of 32
> ports for MediaTek's IOMMU infrastructure. That means there can be at
> most 32 items in the iommus property in theory.
> 
> Instead of relaxing the max item count every time a newly introduced
> device tree hits the limit, bump the number to 32 as an one-time effort.
> 
> On the other hand, all existing and foreseeable JPEG decoder nodes at
> this point have at least 2 IOMMUs, so set minItems to 2 accordingly.
> 
> Signed-off-by: Fei Shao <fshao@...omium.org>
> ---
> It's not in the upstream tree yet, but the upcoming MT8188 DT will have
> 6 IOMMUs in its JPEG decoder. This patch is to pave the way for that.
> 
> Changes in v2:
> New patch.


Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

Best regards,
Krzysztof