linux-kernel - Re: [PATCH 1/7] media: dt-bindings: qcom-kaanapali-iris: Add kaanapali video codec binding

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Message-ID: <r642meaclfme7thmb6spkna6xiuhbjuqw6x32jndjqhwqjtbbr@qkcziz3cyxb6>
Date: Tue, 27 Jan 2026 17:09:04 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Vikash Garodia <vikash.garodia@....qualcomm.com>
Cc: 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>,
        Saravana Kannan <saravanak@...nel.org>, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Stefan Schmidt <stefan.schmidt@...aro.org>,
        Hans Verkuil <hverkuil@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Vishnu Reddy <busanna.reddy@....qualcomm.com>,
        Hans Verkuil <hverkuil+cisco@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        iommu@...ts.linux.dev, Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Subject: Re: [PATCH 1/7] media: dt-bindings: qcom-kaanapali-iris: Add
 kaanapali video codec binding

On Mon, Jan 26, 2026 at 05:55:44PM +0530, Vikash Garodia wrote:
> Kaanapali SOC brings in the new generation of video IP i.e iris4. When
> compared to previous generation, iris3x, it has,
> - separate power domains for stream and pixel processing hardware blocks
>   (bse and vpp).
> - additional power domain for apv codec.
> - power domains for individual pipes (VPPx).
> - different clocks and reset lines.
> 
> iommu-map include all the different stream-ids which can be possibly
> generated by vpu4 hardware.

It's not how it can be defined.

> 
> Signed-off-by: Vikash Garodia <vikash.garodia@....qualcomm.com>
> ---
>  .../bindings/media/qcom,kaanapali-iris.yaml        | 234 +++++++++++++++++++++
>  1 file changed, 234 insertions(+)
> 
> +
> +  iommu-map: true

This is totally underspecifified.

> +
> +  memory-region:
> +    maxItems: 1
> +

> +
> +        iommu-map = <0x100 &apps_smmu 0x1940 0x0 0x1>,
> +                    <0x100 &apps_smmu 0x1a20 0x0 0x1>,
> +                    <0x100 &apps_smmu 0x1944 0x0 0x1>,
> +                    <0x101 &apps_smmu 0x1943 0x0 0x1>,
> +                    <0x200 &apps_smmu 0x1941 0x0 0x1>,
> +                    <0x200 &apps_smmu 0x1a21 0x0 0x1>,
> +                    <0x201 &apps_smmu 0x1945 0x0 0x1>,
> +                    <0x202 &apps_smmu 0x1946 0x0 0x1>,
> +                    <0x300 &apps_smmu 0x1a22 0x0 0x1>;

#define the functions in the ABI, provide them in the bindings.

> +

-- 
With best wishes
Dmitry