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

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Message-Id: <20250225-qps615_v4_1-v4-9-e08633a7bdf8@oss.qualcomm.com>
Date: Tue, 25 Feb 2025 15:04:06 +0530
From: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
To: 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>
Cc: 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,
        Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
Subject: [PATCH v4 09/10] dt-bindings: PCI: qcom,pcie-sc7280: Add 'global'
 interrupt

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
 
   resets:
     maxItems: 1
@@ -149,9 +150,10 @@ examples:
                          <GIC_SPI 313 IRQ_TYPE_LEVEL_HIGH>,
                          <GIC_SPI 314 IRQ_TYPE_LEVEL_HIGH>,
                          <GIC_SPI 374 IRQ_TYPE_LEVEL_HIGH>,
-                         <GIC_SPI 375 IRQ_TYPE_LEVEL_HIGH>;
+                         <GIC_SPI 375 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 306 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 0 434 IRQ_TYPE_LEVEL_HIGH>,

-- 
2.34.1