linux-kernel - Re: [PATCH v2 2/6] dt-bindings: media: camss: Add qcom,kaanapali-camss binding

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Message-ID: <0b6c157a-3d8d-4251-a704-31f8369f6a4e@linaro.org>
Date: Wed, 15 Oct 2025 22:43:27 +0100
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>,
 Hangxiang Ma <hangxiang.ma@....qualcomm.com>,
 Loic Poulain <loic.poulain@....qualcomm.com>, Robert Foss
 <rfoss@...nel.org>, Andi Shyti <andi.shyti@...nel.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Todor Tomov <todor.too@...il.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-i2c@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-media@...r.kernel.org, aiqun.yu@....qualcomm.com,
 tingwei.zhang@....qualcomm.com, trilok.soni@....qualcomm.com,
 yijie.yang@....qualcomm.com, Jingyi Wang <jingyi.wang@....qualcomm.com>,
 Atiya Kailany <atiya.kailany@....qualcomm.com>
Subject: Re: [PATCH v2 2/6] dt-bindings: media: camss: Add
 qcom,kaanapali-camss binding

On 15/10/2025 20:45, Vladimir Zapolskiy wrote:
>> +  power-domains:
>> +    items:
>> +      - description:
>> +          TFE0 GDSC - Thin Front End, Global Distributed Switch 
>> Controller.
>> +      - description:
>> +          TFE1 GDSC - Thin Front End, Global Distributed Switch 
>> Controller.
>> +      - description:
>> +          TFE2 GDSC - Thin Front End, Global Distributed Switch 
>> Controller.
>> +      - description:
>> +          Titan GDSC - Titan ISP Block Global Distributed Switch 
>> Controller.
>> +
>> +  power-domain-names:
>> +    items:
>> +      - const: tfe0
>> +      - const: tfe1
>> +      - const: tfe2
> 
> Please remove all 'tfeX' power domains, they are not going to be utilized
> any time soon.
> 
> When 'power-domains' list is just a single Titan GDSC, 'power-domain-names'
> property is not needed.

Each one of these TFEs powers an individually power-collapsible TFEs.

This is also so with the other xFE power-domains on previous SoC 
generations.

You'll need the TFEx power-domain to process any data on TFEx with the 
'lite' versions being tied to the TOP GDSC.

So please keep the power-domain list, TOP isn't enough.

---
bod