dt-bindings: cpu: Document NVIDIA Tegra186 CCPLEX cluster

Add device tree bindings for the CCPLEX cluster found on NVIDIA Tegra186
SoCs.
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>

Documentation/devicetree/bindings/cpu/nvidia,tegra186-ccplex-cluster.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/cpu/nvidia,tegra186-ccplex-cluster.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NVIDIA Tegra186 CCPLEX Cluster
+
+maintainers:
+  - Thierry Reding <thierry.reding@gmail.com>
+  - Jon Hunter <jonathanh@nvidia.com>
+
+properties:
+  compatible:
+    const: nvidia,tegra186-ccplex-cluster
+
+  reg:
+    maxItems: 1
+
+  nvidia,bpmp:
+    description: phandle to the BPMP used to query CPU frequency tables
+    $ref: /schemas/types.yaml#/definitions/phandle
+
+additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - nvidia,bpmp
+
+examples:
+  - |
+    ccplex@e000000 {
+        compatible = "nvidia,tegra186-ccplex-cluster";
+        reg = <0x0e000000 0x400000>;
+        nvidia,bpmp = <&bpmp>;
+    };