dt-bindings: perf: Add YAML schemas for Marvell CN10K LLC-TAD pmu bindings

Add device tree bindings for Last-level-cache Tag-and-data
(LLC-TAD) unit PMU for Marvell CN10K SoCs.
Signed-off-by: Bhaskara Budiredla <bbudiredla@marvell.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211115043506.6679-3-bbudiredla@marvell.comSigned-off-by: Will Deacon <will@kernel.org>

Documentation/devicetree/bindings/perf/marvell-cn10k-tad.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/perf/marvell-cn10k-tad.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Marvell CN10K LLC-TAD performance monitor
+
+maintainers:
+  - Bhaskara Budiredla <bbudiredla@marvell.com>
+
+description: |
+  The Tag-and-Data units (TADs) maintain coherence and contain CN10K
+  shared on-chip last level cache (LLC). The tad pmu measures the
+  performance of last-level cache. Each tad pmu supports up to eight
+  counters.
+
+  The DT setup comprises of number of tad blocks, the sizes of pmu
+  regions, tad blocks and overall base address of the HW.
+
+properties:
+  compatible:
+    const: marvell,cn10k-tad-pmu
+
+  reg:
+    maxItems: 1
+
+  marvell,tad-cnt:
+    description: specifies the number of tads on the soc
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+  marvell,tad-page-size:
+    description: specifies the size of each tad page
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+  marvell,tad-pmu-page-size:
+    description: specifies the size of page that the pmu uses
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+required:
+  - compatible
+  - reg
+  - marvell,tad-cnt
+  - marvell,tad-page-size
+  - marvell,tad-pmu-page-size
+
+additionalProperties: false
+
+examples:
+  - |
+
+    tad {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        tad_pmu@80000000 {
+            compatible = "marvell,cn10k-tad-pmu";
+            reg = <0x87e2 0x80000000 0x0 0x1000>;
+            marvell,tad-cnt = <1>;
+            marvell,tad-page-size = <0x1000>;
+            marvell,tad-pmu-page-size = <0x1000>;
+        };
+    };