linux-kernel - Re: [PATCH 1/3] dt-bindings: PCI: qcom,pcie-sm8550: document 'global' interrupt

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Message-ID: <20241126125524.cnlvop5gf2zyreu5@thinkpad>
Date: Tue, 26 Nov 2024 18:25:24 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Neil Armstrong <neil.armstrong@...aro.org>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] dt-bindings: PCI: qcom,pcie-sm8550: document
 'global' interrupt

On Tue, Nov 26, 2024 at 11:22:49AM +0100, Neil Armstrong wrote:
> Qcom PCIe RC controllers are capable of generating 'global' SPI interrupt
> to the host CPU. This interrupt can be used by the device driver to handle
> PCIe link specific events such as Link up and Link down, which give the
> driver a chance to start bus enumeration on its own when link is up and
> initiate link training if link goes to a bad state. The PCIe driver can
> still work without this interrupt but it will provide a nice user
> experience when device gets plugged and removed.
> 
> Document the interrupt as optional for SM8550 and SM8650 platforms.
> 
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>

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

- Mani

> ---
>  Documentation/devicetree/bindings/pci/qcom,pcie-sm8550.yaml | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie-sm8550.yaml b/Documentation/devicetree/bindings/pci/qcom,pcie-sm8550.yaml
> index 24cb38673581d7391f877d3af5fadd6096c8d5be..19a614c74fa2aae94556ae3dfc24dcfcd520af11 100644
> --- a/Documentation/devicetree/bindings/pci/qcom,pcie-sm8550.yaml
> +++ b/Documentation/devicetree/bindings/pci/qcom,pcie-sm8550.yaml
> @@ -55,9 +55,10 @@ properties:
>  
>    interrupts:
>      minItems: 8
> -    maxItems: 8
> +    maxItems: 9
>  
>    interrupt-names:
> +    minItems: 8
>      items:
>        - const: msi0
>        - const: msi1
> @@ -67,6 +68,7 @@ properties:
>        - const: msi5
>        - const: msi6
>        - const: msi7
> +      - const: global
>  
>    resets:
>      minItems: 1
> @@ -137,9 +139,10 @@ examples:
>                           <GIC_SPI 145 IRQ_TYPE_LEVEL_HIGH>,
>                           <GIC_SPI 146 IRQ_TYPE_LEVEL_HIGH>,
>                           <GIC_SPI 147 IRQ_TYPE_LEVEL_HIGH>,
> -                         <GIC_SPI 148 IRQ_TYPE_LEVEL_HIGH>;
> +                         <GIC_SPI 148 IRQ_TYPE_LEVEL_HIGH>,
> +                         <GIC_SPI 140 IRQ_TYPE_LEVEL_HIGH>;
>              interrupt-names = "msi0", "msi1", "msi2", "msi3",
> -                              "msi4", "msi5", "msi6", "msi7";
> +                              "msi4", "msi5", "msi6", "msi7", "global";
>              #interrupt-cells = <1>;
>              interrupt-map-mask = <0 0 0 0x7>;
>              interrupt-map = <0 0 0 1 &intc 0 0 0 149 IRQ_TYPE_LEVEL_HIGH>, /* int_a */
> 
> -- 
> 2.34.1
> 

-- 
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