linux-kernel - Re: [PATCH v4 09/10] dt-bindings: PCI: qcom,pcie-sc7280: Add 'global' interrupt

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Message-ID: <20250226-enlightened-chachalaca-of-artistry-2de5ea@krzk-bin>
Date: Wed, 26 Feb 2025 08:32:42 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>, 
	Lorenzo Pieralisi <lpieralisi@...nel.org>, Krzysztof Wilczyński <kw@...ux.com>, 
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	chaitanya chundru <quic_krichai@...cinc.com>, Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konradybcio@...nel.org>, cros-qcom-dts-watchers@...omium.org, 
	Jingoo Han <jingoohan1@...il.com>, Bartosz Golaszewski <brgl@...ev.pl>, quic_vbadigan@...cnic.com, 
	amitk@...nel.org, dmitry.baryshkov@...aro.org, linux-pci@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
	jorge.ramirez@....qualcomm.com
Subject: Re: [PATCH v4 09/10] dt-bindings: PCI: qcom,pcie-sc7280: Add
 'global' interrupt

On Tue, Feb 25, 2025 at 03:04:06PM +0530, Krishna Chaitanya Chundru 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.
> 
> Hence, document it in the binding along with the existing MSI interrupts.
> Global interrupt is parsed as optional in driver, so adding it in bindings
> will not break the ABI.
> 
> Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
> ---
>  Documentation/devicetree/bindings/pci/qcom,pcie-sc7280.yaml | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie-sc7280.yaml b/Documentation/devicetree/bindings/pci/qcom,pcie-sc7280.yaml
> index 76cb9fbfd476..7ae09ba8da60 100644
> --- a/Documentation/devicetree/bindings/pci/qcom,pcie-sc7280.yaml
> +++ b/Documentation/devicetree/bindings/pci/qcom,pcie-sc7280.yaml
> @@ -54,7 +54,7 @@ properties:
>  
>    interrupts:
>      minItems: 8
> -    maxItems: 8
> +    maxItems: 9
>  
>    interrupt-names:
>      items:
> @@ -66,6 +66,7 @@ properties:
>        - const: msi5
>        - const: msi6
>        - const: msi7
> +      - const: global

Either context is missing or these are not synced with interrupts.

Best regards,
Krzysztof