dt-bindings: interrupt-controller: Add bcm2712 MSI-X DT bindings

Adds DT bindings for bcm2712 MSI-X interrupt peripheral controller.

Signed-off-by: Stanimir Varbanov <svarbanov@suse.de>

Author: Stanimir Varbanov

Documentation/devicetree/bindings/interrupt-controller/brcm,bcm2712-msix.yaml

@@ -0,0 +1,60 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/interrupt-controller/brcm,bcm2712-msix.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Broadcom bcm2712 MSI-X Interrupt Peripheral support
+
+maintainers:
+  - Stanimir Varbanov <svarbanov@suse.de>
+
+description:
+  This interrupt controller is used to provide interrupt vectors to the
+  generic interrupt controller (GIC) on bcm2712. It will be used as
+  external MSI-X controller for PCIe root complex.
+
+allOf:
+  - $ref: /schemas/interrupt-controller/msi-controller.yaml#
+
+properties:
+  compatible:
+    const: brcm,bcm2712-mip
+
+  reg:
+    items:
+      - description: Base register address
+      - description: PCIe message address
+
+  "#msi-cells":
+    const: 0
+
+  brcm,msi-offset:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: Shift the allocated MSI's.
+
+unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - msi-controller
+  - msi-ranges
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    axi {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        msi-controller@1000130000 {
+            compatible = "brcm,bcm2712-mip";
+            reg = <0x10 0x00130000 0x00 0xc0>,
+                  <0xff 0xfffff000 0x00 0x1000>;
+            msi-controller;
+            #msi-cells = <0>;
+            msi-ranges = <&gicv2 GIC_SPI 128 IRQ_TYPE_EDGE_RISING 64>;
+        };
+    };