linux-kernel - Re: [PATCH v3 2/8] dt-bindings: PCI: qcom-ep: describe optional IOMMU

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Message-ID: <20250222164550.smiisjruiyyket6u@thinkpad>
Date: Sat, 22 Feb 2025 22:15:50 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Mrinmay Sarkar <quic_msarkar@...cinc.com>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/8] dt-bindings: PCI: qcom-ep: describe optional IOMMU

On Fri, Feb 21, 2025 at 05:52:00PM +0200, Dmitry Baryshkov wrote:
> Some of Qualcomm platforms have an IOMMU unit between the PCIe IP and
> DDR. For example, SA8775P specifies the iommu alththough it is not a
> part of bindings. Change the schema in order to require the IOMMU for
> SA8775P and forbid it from being used on SDX55 (SM8450 will be handled
> in a later patch).
> 
> This fixes the following warning:
> 
> pcie-ep@...0000: Unevaluated properties are not allowed ('iommus' was unexpected)
> 
> Fixes: 9d3d5e75f31c ("dt-bindings: PCI: qcom-ep: Add support for SA8775P SoC")
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

- Mani

> ---
>  Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml b/Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml
> index 0c2ca4cfa3b190b3fb204f0d7142370734fb3534..6075361348352bb8d607acecc76189e28b03dc5b 100644
> --- a/Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml
> +++ b/Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml
> @@ -75,6 +75,9 @@ properties:
>        - const: doorbell
>        - const: dma
>  
> +  iommus:
> +    maxItems: 1
> +
>    reset-gpios:
>      description: GPIO used as PERST# input signal
>      maxItems: 1
> @@ -162,6 +165,7 @@ allOf:
>            maxItems: 2
>          interrupt-names:
>            maxItems: 2
> +        iommus: false
>  
>    - if:
>        properties:
> @@ -234,6 +238,8 @@ allOf:
>          interrupt-names:
>            minItems: 3
>            maxItems: 3
> +      required:
> +        - iommus
>  
>  unevaluatedProperties: false
>  
> 
> -- 
> 2.39.5
> 

-- 
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