linux-kernel - Re: [PATCH v6 1/5] media: dt-bindings: Add CAMSS device for Kaanapali

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Message-ID: <ce15589e-f389-43f4-a671-4f7bf3894f86@oss.qualcomm.com>
Date: Wed, 19 Nov 2025 05:29:30 -0800
From: Vijay Kumar Tumati <vijay.tumati@....qualcomm.com>
To: Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        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>,
        Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: 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 v6 1/5] media: dt-bindings: Add CAMSS device for Kaanapali


On 11/19/2025 1:21 AM, Bryan O'Donoghue wrote:
> On 18/11/2025 21:45, Vijay Kumar Tumati wrote:
>>>> Hi Bryan, HLOS does not have access to those registers. They are 
>>>> configured by the Hyp.
>>> If that's hyp, please add them. We already have platforms without
>>> Gunyah. Remember, bindings are defined once and for good and I wouldn't
>>> call it impossible that someone would want to run that configuration on
>>> Kaanapali some day
>>>
>>> Konrad
>>
>> Sure, if that's the standard. But even on systems without Gunyah 
>> (say, KVM/PKVM), these will not be configured from HLOS in the 
>> regular flow. It will be done from TZ.
>
> By the bootloader/s or by runtime TZ app ?
>
> ---
> bod

The proposed architecture is for it to be done by the TZ (Secure EL1).

Thanks,

Vijay.