[PATCH v5 RESEND 3/5] dt-bindings: arm: Add Coresight TMC Control Unit hardware

[Jie Gan]

Add binding file to specify how to define a Coresight TMC
Control Unit device in device tree.

It is responsible for controlling the data filter function
based on the source device's Trace ID for TMC ETR device.
The trace data with that Trace id can get into ETR's buffer
while other trace data gets ignored.

Reviewed-by: Rob Herring (Arm) <robh at kernel.org>
Signed-off-by: Jie Gan <quic_jiegan at quicinc.com>
---
 .../bindings/arm/qcom,coresight-ctcu.yaml     | 84 +++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/qcom,coresight-ctcu.yaml

diff --git a/Documentation/devicetree/bindings/arm/qcom,coresight-ctcu.yaml b/Documentation/devicetree/bindings/arm/qcom,coresight-ctcu.yaml
new file mode 100644
index 000000000000..843b52eaf872
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/qcom,coresight-ctcu.yaml
@@ -0,0 +1,84 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/qcom,coresight-ctcu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: CoreSight TMC Control Unit
+
+maintainers:
+  - Yuanfang Zhang <quic_yuanfang at quicinc.com>
+  - Mao Jinlong <quic_jinlmao at quicinc.com>
+  - Jie Gan <quic_jiegan at quicinc.com>
+
+description: |
+  The Trace Memory Controller(TMC) is used for Embedded Trace Buffer(ETB),
+  Embedded Trace FIFO(ETF) and Embedded Trace Router(ETR) configurations.
+  The configuration mode (ETB, ETF, ETR) is discovered at boot time when
+  the device is probed.
+
+  The Coresight TMC Control unit controls various Coresight behaviors.
+  It works as a helper device when connected to TMC ETR device.
+  It is responsible for controlling the data filter function based on
+  the source device's Trace ID for TMC ETR device. The trace data with
+  that Trace id can get into ETR's buffer while other trace data gets
+  ignored.
+
+properties:
+  compatible:
+    enum:
+      - qcom,sa8775p-ctcu
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: apb
+
+  in-ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    patternProperties:
+      '^port(@[0-1])?$':
+        description: Input connections from CoreSight Trace bus
+        $ref: /schemas/graph.yaml#/properties/port
+
+required:
+  - compatible
+  - reg
+  - in-ports
+
+additionalProperties: false
+
+examples:
+  - |
+    ctcu at 1001000 {
+        compatible = "qcom,sa8775p-ctcu";
+        reg = <0x1001000 0x1000>;
+
+        clocks = <&aoss_qmp>;
+        clock-names = "apb";
+
+        in-ports {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            port at 0 {
+                reg = <0>;
+                ctcu_in_port0: endpoint {
+                    remote-endpoint = <&etr0_out_port>;
+                };
+            };
+
+            port at 1 {
+                reg = <1>;
+                ctcu_in_port1: endpoint {
+                    remote-endpoint = <&etr1_out_port>;
+                };
+            };
+        };
+    };
-- 
2.34.1