linux-kernel - Re: [PATCH 2/4] dt-bindings: media: qcom,sm8550-iris: document SA8775p IRIS accelerator

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Message-ID: <5e4838e5-b5f1-7107-78b8-cfd9d5620e2e@quicinc.com>
Date: Wed, 12 Mar 2025 13:37:16 +0530
From: Vikash Garodia <quic_vgarodia@...cinc.com>
To: Dmitry Baryshkov <lumag@...nel.org>
CC: Dikshita Agarwal <quic_dikshita@...cinc.com>,
        Abhinav Kumar
	<quic_abhinavk@...cinc.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        "Rob
 Herring" <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        "Conor
 Dooley" <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        "Konrad Dybcio" <konradybcio@...nel.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-media@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] dt-bindings: media: qcom,sm8550-iris: document
 SA8775p IRIS accelerator


On 3/11/2025 9:01 PM, Dmitry Baryshkov wrote:
> On Tue, Mar 11, 2025 at 05:33:54PM +0530, Vikash Garodia wrote:
>> Document the IRIS video decoder and encoder accelerator found in the
>> SA8775P platform. SA8775P has collapsible MX compared to SM8550.
> 
> How compatible is SA8775P to SM8550? Should it be using a fallback
> compatible?
They are quite compatible. At the moment i do not see any reason for not using
fallback compatible. Later, if we want to distinguish the associated platform
data for SA8775P and SM8550, the compatible can be made independent and use it
in driver to associate with its own platform data ?
> 
> This kind of comes as a more generic question: is there anything like
> 'IP version' or 'core version'? It would be really nice to determine the
> 'baseline' SoCs and make other instances compatible with the baseline.
It would be helpful if you can elaborate more on this with some drivers
following it (if any) ?

Regards,
Vikash
>>
>> Signed-off-by: Vikash Garodia <quic_vgarodia@...cinc.com>
>> ---
>>  Documentation/devicetree/bindings/media/qcom,sm8550-iris.yaml | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/media/qcom,sm8550-iris.yaml b/Documentation/devicetree/bindings/media/qcom,sm8550-iris.yaml
>> index 440a0d7cdfe19a1ccedefc207d96b26eed5d6630..20ac596638ba33f49cce9e42d70d31a8aaa7c36e 100644
>> --- a/Documentation/devicetree/bindings/media/qcom,sm8550-iris.yaml
>> +++ b/Documentation/devicetree/bindings/media/qcom,sm8550-iris.yaml
>> @@ -19,7 +19,9 @@ allOf:
>>  
>>  properties:
>>    compatible:
>> -    const: qcom,sm8550-iris
>> +    enum:
>> +      - qcom,sm8550-iris
>> +      - qcom,sa8775p-iris
>>  
>>    power-domains:
>>      maxItems: 4
>>
>> -- 
>> 2.34.1
>>
>