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

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Message-ID: <CAC=S1nhF7CiiGaNASiqYw4Av7MQfLJsUa1HrYsx9n4D2sAP7Gg@mail.gmail.com>
Date: Wed, 2 Oct 2024 19:57:35 +0800
From: Fei Shao <fshao@...omium.org>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 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 Wed, Oct 2, 2024 at 2:16 PM Krzysztof Kozlowski <krzk@...nel.org> wrote:
>
> On Tue, Oct 01, 2024 at 07:27:21PM +0800, 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.
> >
>
> I do not see any user of this in this patchset.
>

Sorry, I was doing more checks before sending out that series.
The particular patch depending on this is now available as
https://lore.kernel.org/all/20241002114614.847553-6-fshao@chromium.org/

Regards,
Fei