[PATCH v1 2/4] dt-bindings: PCI: dwc: rockchip: Add missing legacy-interrupt-controller

[Sebastian Reichel]

Rockchip RK356x and RK3588 handle legacy interrupts via a ganged
interrupts. The RK356x DT implements this via a sub-node named
"legacy-interrupt-controller", just like a couple of other PCIe
implementations. This adds proper documentation for this and updates
the example to avoid regressions.

Signed-off-by: Sebastian Reichel <sebastian.reichel at collabora.com>
---
 .../bindings/pci/rockchip-dw-pcie.yaml        | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml b/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml
index 98e45d2d8dfe..bf81d306cc80 100644
--- a/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml
+++ b/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml
@@ -67,6 +67,22 @@ properties:
       - const: legacy
       - const: err
 
+  legacy-interrupt-controller:
+    description: Interrupt controller node for handling legacy PCI interrupts.
+    type: object
+    properties:
+      "#address-cells":
+        const: 0
+
+      "#interrupt-cells":
+        const: 1
+
+      "interrupt-controller": true
+
+      interrupts:
+        items:
+          - description: combined legacy interrupt
+
   msi-map: true
 
   num-lanes: true
@@ -148,6 +164,14 @@ examples:
             reset-names = "pipe";
             #address-cells = <3>;
             #size-cells = <2>;
+
+            legacy-interrupt-controller {
+                interrupt-controller;
+                #address-cells = <0>;
+                #interrupt-cells = <1>;
+                interrupt-parent = <&gic>;
+                interrupts = <GIC_SPI 72 IRQ_TYPE_EDGE_RISING>;
+            };
         };
     };
 ...
-- 
2.39.2