dt-bindings: perf: starfive: Add JH8100 StarLink PMU

Add device tree binding for StarFive's JH8100 StarLink PMU (Performance
Monitor Unit).
Signed-off-by: Ji Sheng Teoh <jisheng.teoh@starfivetech.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240229072720.3987876-3-jisheng.teoh@starfivetech.comSigned-off-by: Will Deacon <will@kernel.org>

Documentation/devicetree/bindings/perf/starfive,jh8100-starlink-pmu.yaml

+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/perf/starfive,jh8100-starlink-pmu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: StarFive JH8100 StarLink PMU
+
+maintainers:
+  - Ji Sheng Teoh <jisheng.teoh@starfivetech.com>
+
+description:
+  StarFive's JH8100 StarLink PMU integrates one or more CPU cores with a
+  shared L3 memory system. The PMU support overflow interrupt, up to
+  16 programmable 64bit event counters, and an independent 64bit cycle
+  counter. StarFive's JH8100 StarLink PMU is accessed via MMIO.
+
+properties:
+  compatible:
+    const: starfive,jh8100-starlink-pmu
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        pmu@12900000 {
+            compatible = "starfive,jh8100-starlink-pmu";
+            reg = <0x0 0x12900000 0x0 0x10000>;
+            interrupts = <34>;
+        };
+    };