linux-kernel - Re: [PATCH v2 1/8] media: dt-bindings: qcom-kaanapali-iris: Add kaanapali video codec binding

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Message-ID: <mtlwpa3m46qwrfjcpa7wapjjnllxopoip4mpnomw2ngteb6btf@2z4hrjr74bts>
Date: Wed, 22 Oct 2025 12:37:34 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Vikash Garodia <vikash.garodia@....qualcomm.com>
Cc: Krzysztof Kozlowski <krzk@...nel.org>,
        Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Bryan O'Donoghue <bod@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        linux-arm-msm@...r.kernel.org, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Vishnu Reddy <quic_bvisredd@...cinc.com>
Subject: Re: [PATCH v2 1/8] media: dt-bindings: qcom-kaanapali-iris: Add
 kaanapali video codec binding

On Wed, Oct 22, 2025 at 02:37:59AM +0530, Vikash Garodia wrote:
> 
> On 10/22/2025 12:45 AM, Krzysztof Kozlowski wrote:
> > On 21/10/2025 20:55, Vikash Garodia wrote:
> >>
> >> On 10/18/2025 9:28 PM, Krzysztof Kozlowski wrote:
> >>> On 17/10/2025 16:16, Vikash Garodia wrote:
> >>>> +  clock-names:
> >>>> +    items:
> >>>> +      - const: iface
> >>>> +      - const: core
> >>>> +      - const: vcodec0_core
> >>>> +      - const: iface1
> >>>> +      - const: core_freerun
> >>>> +      - const: vcodec0_core_freerun
> >>>> +      - const: vcodec_bse
> >>>> +      - const: vcodec_vpp0
> >>>> +      - const: vcodec_vpp1
> >>>> +      - const: vcodec_apv
> >>>> +
> >>>> +  dma-coherent: true
> >>>> +
> >>>> +  firmware-name:
> >>>> +    maxItems: 1
> >>>> +
> >>>> +  interconnects:
> >>>> +    maxItems: 2
> >>>> +
> >>>> +  interconnect-names:
> >>>> +    items:
> >>>> +      - const: cpu-cfg
> >>>> +      - const: video-mem
> >>>> +
> >>>> +  interrupts:
> >>>> +    maxItems: 1
> >>>> +
> >>>> +  iommus:
> >>>> +    minItems: 3
> >>>> +    maxItems: 8
> >>>
> >>> I don't understand why this is flexible. Make it fixed size and anyway -
> >>> list the items.
> >>
> >> kaanapali vpu generates 8 different stream-ids. Now, boards running kernel in
> >> EL2 mode can list all of them, while boards running in EL1 can have only non
> >> secure stream IDs. Min have the list of stream ids which can be enabled for all
> >> type of boards, while max is for boards which can list all in HLOS given kernel
> >> is in EL2 mode.
> >>
> >> Below crash would be seen if boards running kernel in EL1 mode lists the secure
> >> ones.
> > 
> > 
> > That has to be explained somewhere, e.g. comment, 
> 
> Sure, will add a description for iommus property explaining the same.
> 
> and still we need then
> > EL2 DTS in the kernel. I did not see such so far, but maybe I missed it
> > - can you link it?
> > 
> 
> EL2 DTS for kaanapali is not yet posted to handle secure SIDs. While it is in
> development, describing the secure stream-ids would ensure to cover all the
> hardware generated IDs.

EL2 is a slightly different topic, it most likely requires additional
changes, etc. I'd suggest focusing on a normal usecase first and getting
the EL2 sorted out separately.

-- 
With best wishes
Dmitry