linux-kernel - Re: [PATCH v3 0/5] Introduce "non-pixel" sub node within iris video node

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Message-ID: <e15f156c-cb38-4566-b275-ba156a7b598d@kernel.org>
Date: Thu, 9 Oct 2025 18:11:13 +0900
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Bryan O'Donoghue <bod@...nel.org>,
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
 Charan Teja Kalla <charan.kalla@....qualcomm.com>,
 Bryan O'Donoghue <bod.linux@...w.ie>,
 Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
 Vikash Garodia <quic_vgarodia@...cinc.com>,
 Dikshita Agarwal <quic_dikshita@...cinc.com>,
 Abhinav Kumar <abhinav.kumar@...ux.dev>,
 Mauro Carvalho Chehab <mchehab@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, linux-media@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/5] Introduce "non-pixel" sub node within iris video
 node

On 09/10/2025 17:38, Bryan O'Donoghue wrote:
> On 09/10/2025 02:04, Krzysztof Kozlowski wrote:
>>> The iommu description for this platform basically lacks the data that
>>> _should_ be there -> FUNCTION_ID.
>> No. The index tells that already.
> 
> Hmm.
>>> The rule is that the DT should really describe the hardware right ?
>> It already does. Same as I wrote on IRC, DT already has all the
>> information. Entry 0 has function ID-foo. Entry 1 has function ID-bar.
>> Entry 2 has function ID-bar or whatever.
> 
> That's the part I don't believe is true its a 1:Many relationship 
> between FUNCTION_ID:SIDs
> 
> Let me check the docs...
> 
> Here's the example I gave on IRC for lore
> 
> SID 0x1940 maps to AC_VM_HLOS (Linux)
> SID 0x1941 maps to AC_VM_CP_BITSTREAM - protected bitstream
> SID 0x1945 maps to AC_WM_CP_BITSTREAM
> 

I responded to this on IRC... Nothing proves here that 1:many cannot be
done.

Best regards,
Krzysztof