[PATCH] dt-bindings: interrupt-controller: Add Xilinx INTC binding

[Michal Simek <michal.simek@amd.com>]

Add description for AMD/Xilinx interrupt controller.
IP acts as primary interrupt controller on Microblaze systems or can be
used as secondary interrupt controller on ARM based systems like Zynq,
ZynqMP, Versal or Versal Gen 2. Also as secondary interrupt controller on
Microblaze-V (Risc-V) systems.

Over the years IP exists in multiple variants based on attached bus as OPB,
PLB or AXI that's why generic filename is used.

Signed-off-by: Michal Simek <michal.simek@amd.com>
---

https://docs.amd.com/v/u/en-US/pg099-axi-intc
---
 .../interrupt-controller/xlnx,intc.yaml       | 95 +++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/xlnx,intc.yaml

diff --git a/Documentation/devicetree/bindings/interrupt-controller/xlnx,intc.yaml b/Documentation/devicetree/bindings/interrupt-controller/xlnx,intc.yaml
new file mode 100644
index 000000000000..816f78d4e8c4
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/xlnx,intc.yaml
@@ -0,0 +1,95 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/interrupt-controller/xlnx,intc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Xilinx Interrupt Controller
+
+maintainers:
+  - Michal Simek <michal.simek@amd.com>
+
+description:
+  The controller is a soft IP core that is configured at build time for the
+  number of interrupts and the type of each interrupt. These details cannot
+  be changed at run time.
+
+properties:
+  compatible:
+    const: xlnx,xps-intc-1.00.a
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  power-domains:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+  "#interrupt-cells":
+    const: 2
+    description:
+      Specifies the number of cells needed to encode an interrupt source.
+      The value shall be a minimum of 1. The Xilinx device trees typically
+      use 2 but the 2nd value is not used.
+
+  interrupt-controller: true
+
+  interrupts:
+    maxItems: 1
+    description:
+      Specifies the interrupt of the parent controller from which it is chained.
+
+  xlnx,kind-of-intr:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      A 32 bit value specifying the interrupt type for each possible interrupt
+      (1 = edge, 0 = level). The interrupt type typically comes in thru
+      the device tree node of the interrupt generating device, but in this case
+      the interrupt type is determined by the interrupt controller based on how
+      it was implemented.
+
+  xlnx,num-intr-inputs:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Specifies the number of interrupts supported by the specific
+      implementation of the controller (1-32).
+
+required:
+  - reg
+  - "#interrupt-cells"
+  - interrupt-controller
+  - xlnx,kind-of-intr
+  - xlnx,num-intr-inputs
+
+additionalProperties: false
+
+examples:
+  - |
+    interrupt-controller@41800000 {
+      compatible = "xlnx,xps-intc-1.00.a";
+      reg = <0x41800000 0x10000>;
+      #interrupt-cells = <2>;
+      interrupt-controller;
+      xlnx,kind-of-intr = <0x1>;
+      xlnx,num-intr-inputs = <0x1>;
+    };
+
+  - |
+    /*
+     * Chained Example - The interrupt is chained to hardware
+     * interrupt 61 (29 + 32) of the GIC for Zynq.
+     */
+    interrupt-controller@41800000 {
+      compatible = "xlnx,xps-intc-1.00.a";
+      reg = <0x41800000 0x10000>;
+      #interrupt-cells = <2>;
+      interrupt-controller;
+      interrupts = <0 29 4>;
+      xlnx,kind-of-intr = <0x1>;
+      xlnx,num-intr-inputs = <0x1>;
+    };
-- 
2.43.0