linux-kernel - Re: [PATCH v2 2/3] dt-bindings: PCI: qcom: Document msi-map and msi-map-mask properties

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Message-ID: <20221222190141.GA1908434-robh@kernel.org>
Date:   Thu, 22 Dec 2022 13:01:41 -0600
From:   Rob Herring <robh@...nel.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     andersson@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        bhelgaas@...gle.com, konrad.dybcio@...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 v2 2/3] dt-bindings: PCI: qcom: Document msi-map and
 msi-map-mask properties

On Thu, Dec 22, 2022 at 07:01:22PM +0530, Manivannan Sadhasivam wrote:
> The Qcom PCIe controller is capable of using either internal MSI controller
> or the external GIC-ITS for receiving the MSIs from endpoint devices.
> Currently, the binding only documents the internal MSI implementation.
> 
> Let's document the GIC-ITS imeplementation by making use of msi-map and
> msi-map-mask properties. Only one of the implementation should be used
> at a time.

Isn't that up to the OS to decide? Some versions may not support MSIs.

What about legacy interrupts? Don't you need to keep the interrupt 
properties for them?

> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>  Documentation/devicetree/bindings/pci/qcom,pcie.yaml | 12 +++++++++---
>  1 file changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie.yaml b/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
> index 02450fb26bb9..10fec6a7abfc 100644
> --- a/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
> +++ b/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
> @@ -104,14 +104,20 @@ required:
>    - compatible
>    - reg
>    - reg-names
> -  - interrupts
> -  - interrupt-names
> -  - "#interrupt-cells"
>    - interrupt-map-mask
>    - interrupt-map
>    - clocks
>    - clock-names
>  
> +oneOf:
> +  - required:
> +      - interrupts
> +      - interrupt-names
> +      - "#interrupt-cells"
> +  - required:
> +      - msi-map
> +      - msi-map-mask
> +
>  allOf:
>    - $ref: /schemas/pci/pci-bus.yaml#
>    - if:
> -- 
> 2.25.1
> 
>