dt-bindings: devfreq: event: convert Samsung Exynos NoCP to dtschema

Convert Samsung Exynos NoC Probe bindings to DT schema format using
json-schema.

New bindings contain copied description from previous bindings document,
therefore the license is set as GPL-2.0-only.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20210820150353.161161-1-krzysztof.kozlowski@canonical.com
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/devfreq/event/samsung,exynos-nocp.yaml

@@ -0,0 +1,48 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/devfreq/event/samsung,exynos-nocp.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Samsung Exynos NoC (Network on Chip) Probe
+
+maintainers:
+  - Chanwoo Choi <cw00.choi@samsung.com>
+  - Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
+
+description: |
+  The Samsung Exynos542x SoC has a NoC (Network on Chip) Probe for NoC bus.
+  NoC provides the primitive values to get the performance data. The packets
+  that the Network on Chip (NoC) probes detects are transported over the
+  network infrastructure to observer units. You can configure probes to capture
+  packets with header or data on the data request response network, or as
+  traffic debug or statistic collectors. Exynos542x bus has multiple NoC probes
+  to provide bandwidth information about behavior of the SoC that you can use
+  while analyzing system performance.
+
+properties:
+  compatible:
+    const: samsung,exynos5420-nocp
+
+  clock-names:
+    items:
+      - const: nocp
+
+  clocks:
+    maxItems: 1
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    nocp_mem0_0: nocp@10ca1000 {
+        compatible = "samsung,exynos5420-nocp";
+        reg = <0x10ca1000 0x200>;
+    };