diff mbox series

[v2,04/13] dt-bindings: PCI: pci-ep: Document 'linux,pci-domain' property

Message ID 20240717-pci-qcom-hotplug-v2-4-71d304b817f8@linaro.org (mailing list archive)
State Superseded
Headers show
Series PCI: qcom: Simulate PCIe hotplug using 'global' interrupt | expand

Commit Message

Manivannan Sadhasivam via B4 Relay July 17, 2024, 5:03 p.m. UTC 
From: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

'linux,pci-domain' property provides the PCI domain number for the PCI
endpoint controllers in a SoC. If this property is not present, then an
unstable (across boots) unique number will be assigned.

Devicetrees can specify the domain number based on the actual hardware
instance of the PCI endpoint controllers in the SoC.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 Documentation/devicetree/bindings/pci/pci-ep.yaml       | 11 +++++++++++
 Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml |  1 +
 2 files changed, 12 insertions(+)

Comments

Rob Herring (Arm) July 23, 2024, 2:33 a.m. UTC | #1 
On Wed, 17 Jul 2024 22:33:09 +0530, Manivannan Sadhasivam wrote:
> 'linux,pci-domain' property provides the PCI domain number for the PCI
> endpoint controllers in a SoC. If this property is not present, then an
> unstable (across boots) unique number will be assigned.
> 
> Devicetrees can specify the domain number based on the actual hardware
> instance of the PCI endpoint controllers in the SoC.
> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> ---
>  Documentation/devicetree/bindings/pci/pci-ep.yaml       | 11 +++++++++++
>  Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml |  1 +
>  2 files changed, 12 insertions(+)
> 

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/pci/pci-ep.yaml b/Documentation/devicetree/bindings/pci/pci-ep.yaml
index 0b5456ee21eb..f75000e3093d 100644
--- a/Documentation/devicetree/bindings/pci/pci-ep.yaml
+++ b/Documentation/devicetree/bindings/pci/pci-ep.yaml
@@ -42,6 +42,17 @@  properties:
     default: 1
     maximum: 16
 
+  linux,pci-domain:
+    description:
+      If present this property assigns a fixed PCI domain number to a PCI
+      Endpoint Controller, otherwise an unstable (across boots) unique number
+      will be assigned. It is required to either not set this property at all
+      or set it for all PCI endpoint controllers in the system, otherwise
+      potentially conflicting domain numbers may be assigned to endpoint
+      controllers. The domain number for each endpoint controller in the system
+      must be unique.
+    $ref: /schemas/types.yaml#/definitions/uint32
+
 required:
   - compatible
 
diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml b/Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml
index 46802f7d9482..1226ee5d08d1 100644
--- a/Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml
+++ b/Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml
@@ -280,4 +280,5 @@  examples:
         phy-names = "pciephy";
         max-link-speed = <3>;
         num-lanes = <2>;
+        linux,pci-domain = <0>;
     };