linux-kernel - Re: [PATCH v2 1/3] dt-bindings: display: msm: qcm2290-mdss: Fix iommus property

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Message-ID: <20260116-transparent-dexterous-nightingale-c029cb@quoll>
Date: Fri, 16 Jan 2026 09:46:54 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Sumit Garg <sumit.garg@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
	andersson@...nel.org, konradybcio@...nel.org, robh@...nel.org, krzk+dt@...nel.org, 
	conor+dt@...nel.org, akhilpo@....qualcomm.com, vikash.garodia@....qualcomm.com, 
	dikshita.agarwal@....qualcomm.com, robin.clark@....qualcomm.com, lumag@...nel.org, 
	loic.poulain@....qualcomm.com, jorge.ramirez@....qualcomm.com, linux-kernel@...r.kernel.org, 
	Sumit Garg <sumit.garg@....qualcomm.com>
Subject: Re: [PATCH v2 1/3] dt-bindings: display: msm: qcm2290-mdss: Fix
 iommus property

On Fri, Jan 16, 2026 at 11:50:02AM +0530, Sumit Garg wrote:
> From: Sumit Garg <sumit.garg@....qualcomm.com>
> 
> Fix IOMMU DT propety for display via dropping SMMU stream IDs which
> relates to secure context bank. Assigning Linux kernel (HLOS) VMID
> to secure context bank stream IDs is incorrect.
> 
> The min value is added for iommus property to ensure in future when
> secure context bank stream IDs are properly supported then the iommus
> property is extensible.
> 
> These DT bindings changes should be backwards compatible.
> 
> Signed-off-by: Sumit Garg <sumit.garg@....qualcomm.com>
> ---
>  .../devicetree/bindings/display/msm/qcom,qcm2290-mdss.yaml   | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/msm/qcom,qcm2290-mdss.yaml b/Documentation/devicetree/bindings/display/msm/qcom,qcm2290-mdss.yaml
> index f0cdb5422688..5c888f07bc0b 100644
> --- a/Documentation/devicetree/bindings/display/msm/qcom,qcm2290-mdss.yaml
> +++ b/Documentation/devicetree/bindings/display/msm/qcom,qcm2290-mdss.yaml
> @@ -33,6 +33,7 @@ properties:
>        - const: core
>  
>    iommus:
> +    minItems: 1

Same comment as other changes like that, which I already gave guideline
- you need to list the items (minItems stay), because you now claim the
order matters and is strictly defined.

Best regards,
Krzysztof