linux-kernel - Re: [PATCH v2 6/8] dt-bindings: reserved-memory: Add secure CMA reserved memory range

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Message-ID: <3daaa2aa-61d4-40db-b36d-cd825a340d2b@arm.com>
Date:   Tue, 14 Nov 2023 13:18:35 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     Yong Wu (吴勇) <Yong.Wu@...iatek.com>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "christian.koenig@....com" <christian.koenig@....com>,
        "krzysztof.kozlowski@...aro.org" <krzysztof.kozlowski@...aro.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "sumit.semwal@...aro.org" <sumit.semwal@...aro.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
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        Jianjiao Zeng (曾健姣) 
        <Jianjiao.Zeng@...iatek.com>,
        Kuohong Wang (王國鴻) 
        <kuohong.wang@...iatek.com>,
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        <angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH v2 6/8] dt-bindings: reserved-memory: Add secure CMA
 reserved memory range

On 13/11/2023 6:37 am, Yong Wu (吴勇) wrote:
[...]
>>> +properties:
>>> +  compatible:
>>> +    const: secure_cma_region
>>
>> Still wrong compatible. Look at other bindings - there is nowhere
>> underscore. Look at other reserved memory bindings especially.
>>
>> Also, CMA is a Linux thingy, so either not suitable for bindings at
>> all,
>> or you need Linux specific compatible. I don't quite get why do you
>> evennot
>> put CMA there - adding Linux specific stuff will get obvious
>> pushback...
> 
> Thanks. I will change to: secure-region. Is this ok?

No, the previous discussion went off in entirely the wrong direction. To 
reiterate, the point of the binding is not to describe the expected 
usage of the thing nor the general concept of the thing, but to describe 
the actual thing itself. There are any number of different ways software 
may interact with a "secure region", so that is meaningless as a 
compatible. It needs to describe *this* secure memory interface offered 
by *this* TEE, so that software knows that to use it requires making 
those particular SiP calls with that particular UUID etc.

Thanks,
Robin.