dt-bindings: arm: Convert CoreSight bindings to DT schema

Each CoreSight component has slightly different requirements and
nothing applies to every component, so each CoreSight component has its
own schema document.

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20220603011933.3277315-3-robh@kernel.org
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

1 files changed, 101 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/arm/arm,coresight-stm.yaml b/Documentation/devicetree/bindings/arm/arm,coresight-stm.yaml
new file mode 100644
index 000000000000..905008faa012
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/arm,coresight-stm.yaml
@@ -0,0 +1,101 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/arm,coresight-stm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Arm CoreSight System Trace MacroCell
+
+maintainers:
+  - Mathieu Poirier <mathieu.poirier@linaro.org>
+  - Mike Leach <mike.leach@linaro.org>
+  - Leo Yan <leo.yan@linaro.org>
+  - Suzuki K Poulose <suzuki.poulose@arm.com>
+
+description: |
+  CoreSight components are compliant with the ARM CoreSight architecture
+  specification and can be connected in various topologies to suit a particular
+  SoCs tracing needs. These trace components can generally be classified as
+  sinks, links and sources. Trace data produced by one or more sources flows
+  through the intermediate links connecting the source to the currently selected
+  sink.
+
+  The STM is a trace source that is integrated into a CoreSight system, designed
+  primarily for high-bandwidth trace of instrumentation embedded into software.
+  This instrumentation is made up of memory-mapped writes to the STM Advanced
+  eXtensible Interface (AXI) slave, which carry information about the behavior
+  of the software.
+
+select:
+  properties:
+    compatible:
+      contains:
+        const: arm,coresight-stm
+  required:
+    - compatible
+
+allOf:
+  - $ref: /schemas/arm/primecell.yaml#
+
+properties:
+  compatible:
+    items:
+      - const: arm,coresight-stm
+      - const: arm,primecell
+
+  reg:
+    maxItems: 2
+
+  reg-names:
+    items:
+      - const: stm-base
+      - const: stm-stimulus-base
+
+  clocks:
+    minItems: 1
+    maxItems: 2
+
+  clock-names:
+    minItems: 1
+    items:
+      - const: apb_pclk
+      - const: atclk
+
+  out-ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+    additionalProperties: false
+
+    properties:
+      port:
+        description: Output connection to the CoreSight Trace bus.
+        $ref: /schemas/graph.yaml#/properties/port
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - clocks
+  - clock-names
+  - out-ports
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    stm@20100000 {
+        compatible = "arm,coresight-stm", "arm,primecell";
+        reg = <0x20100000 0x1000>,
+              <0x28000000 0x180000>;
+        reg-names = "stm-base", "stm-stimulus-base";
+
+        clocks = <&soc_smc50mhz>;
+        clock-names = "apb_pclk";
+        out-ports {
+            port {
+                stm_out_port: endpoint {
+                    remote-endpoint = <&main_funnel_in_port2>;
+                };
+            };
+        };
+    };
+...