[PATCH v2 4/5] dt-bindings/perf: Add Arm CoreSight PMU

[Robin Murphy]

Add a binding for implementations of the Arm CoreSight Performance
Monitoring Unit Architecture. Not to be confused with CoreSight debug
and trace, the PMU architecture defines a standard MMIO interface for
event counters following a similar design to the CPU PMU architecture,
where the implementation and most of its features are discoverable
through ID registers.

CC: Rob Herring <robh+dt at kernel.org>
CC: Krzysztof Kozlowski <krzysztof.kozlowski+dt at linaro.org>
CC: Conor Dooley <conor+dt at kernel.org>
Signed-off-by: Robin Murphy <robin.murphy at arm.com>
---
v2: Use reg-io-width instead of a new property; tweak descriptions
---
 .../bindings/perf/arm,coresight-pmu.yaml      | 39 +++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/perf/arm,coresight-pmu.yaml

diff --git a/Documentation/devicetree/bindings/perf/arm,coresight-pmu.yaml b/Documentation/devicetree/bindings/perf/arm,coresight-pmu.yaml
new file mode 100644
index 000000000000..0fcc5bb610f3
--- /dev/null
+++ b/Documentation/devicetree/bindings/perf/arm,coresight-pmu.yaml
@@ -0,0 +1,39 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/perf/arm,coresight-pmu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Arm Coresight Performance Monitoring Unit Architecture
+
+maintainers:
+  - Robin Murphy <robin.murphy at arm.com>
+
+properties:
+  compatible:
+    const: arm,coresight-pmu
+
+  reg:
+    items:
+      - description: Register page 0
+      - description: Register page 1, if the PMU implements the dual-page extension
+    minItems: 1
+
+  interrupts:
+    items:
+      - description: Overflow interrupt
+
+  cpus:
+    description: If the PMU is associated with a particular CPU or subset of CPUs, array of phandles to those CPUs
+
+  reg-io-width:
+    description: Granularity at which PMU register accesses are single-copy atomic
+    default: 4
+    enum: [4, 8]
+
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
-- 
2.39.2.101.g768bb238c484.dirty