linux-kernel - Re: [PATCH 1/2] dt-bindings: media: mediatek-jpeg-encoder: change max ioomus count

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Message-ID: <94beea2a-c4b9-4241-bbfe-8c57ca50fbf7@collabora.com>
Date: Mon, 15 Jan 2024 05:57:04 +0200
From: Eugen Hristev <eugen.hristev@...labora.com>
To: Rob Herring <robh@...nel.org>
Cc: bin.liu@...iatek.com, matthias.bgg@...il.com,
 angelogioacchino.delregno@...labora.com, linux-media@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 1/2] dt-bindings: media: mediatek-jpeg-encoder: change max
 ioomus count

On 1/9/24 05:27, Rob Herring wrote:
> On Wed, Dec 27, 2023 at 03:08:11PM +0200, Eugen Hristev wrote:
>> MT8186 has 4 iommus in the list, to cope with this situation, adjust
>> the maxItems to 4 (instead of previous 2).
>> Add also minItems as 1 since iommus are mandatory, to avoid warning
>> on the example.
> 
> maxItems alone means minItems is the same size. If IOMMU is required, 
> then 'required' is where that is defined. Is there a case where 1 IOMMU 
> is valid? If so, what h/w has this case.
> 
> Rob
> 
> 

Hello Rob,

Without setting a minItems , the example in the binding fails, because it has just
2 items, while the maxItems is now 4.
I set minItems as 1 to avoid restricting any kind of hardware to have at least 2
items, but if you claim that previously, maxItems=minItems=2 , I will change this to 2.
Is that fine with you ?

Eugen