linux-kernel - [PATCH 01/11] dt-bindings: Add RISC-V trace component bindings

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Message-ID: <20251002060732.100213-2-apatel@ventanamicro.com>
Date: Thu,  2 Oct 2025 11:37:22 +0530
From: Anup Patel <apatel@...tanamicro.com>
To: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Ian Rogers <irogers@...gle.com>
Cc: Alexandre Ghiti <alex@...ti.fr>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Liang Kan <kan.liang@...ux.intel.com>,
	Mayuresh Chitale <mchitale@...il.com>,
	Anup Patel <anup@...infault.org>,
	Atish Patra <atish.patra@...ux.dev>,
	Andrew Jones <ajones@...tanamicro.com>,
	Sunil V L <sunilvl@...tanamicro.com>,
	linux-riscv@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Anup Patel <apatel@...tanamicro.com>
Subject: [PATCH 01/11] dt-bindings: Add RISC-V trace component bindings

Add device tree bindings for the memory mapped RISC-V trace components
which support both the RISC-V efficient trace (E-trace) protocol and
the RISC-V Nexus-based trace (N-trace) protocol.

The RISC-V trace components are defined by the RISC-V trace control
interface specification.

Signed-off-by: Anup Patel <apatel@...tanamicro.com>
---
 .../bindings/riscv/riscv,trace-component.yaml | 110 ++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/riscv/riscv,trace-component.yaml

diff --git a/Documentation/devicetree/bindings/riscv/riscv,trace-component.yaml b/Documentation/devicetree/bindings/riscv/riscv,trace-component.yaml
new file mode 100644
index 000000000000..78a70fe04dfe
--- /dev/null
+++ b/Documentation/devicetree/bindings/riscv/riscv,trace-component.yaml
@@ -0,0 +1,110 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/riscv/riscv,trace-component.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: RISC-V Trace Component
+
+maintainers:
+  - Anup Patel <anup@...infault.org>
+
+description:
+  The RISC-V trace control interface specification standard memory mapped
+  components (or devices) which support both the RISC-V efficient trace
+  (E-trace) protocol and the RISC-V Nexus-based trace (N-trace) protocol.
+  The RISC-V trace components have implementation specific directed acyclic
+  graph style interdependency where output of one component serves as input
+  to another component and certain components (such as funnel) can take inputs
+  from multiple components.
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - qemu,trace-component
+      - const: riscv,trace-component
+
+  reg:
+    maxItems: 1
+
+  cpu:
+    description:
+      phandle to the cpu to which the RISC-V trace component is bound.
+    $ref: /schemas/types.yaml#/definitions/phandle
+
+  in-ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+    patternProperties:
+      '^port(@[0-7])?$':
+        description: Input connections from RISC-V trace component
+        $ref: /schemas/graph.yaml#/properties/port
+
+  out-ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+    patternProperties:
+      '^port(@[0-7])?$':
+        description: Output connections from RISC-V trace component
+        $ref: /schemas/graph.yaml#/properties/port
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    // Example 1 (Per-hart encoder and ramsink components):
+
+    encoder@...0000 {
+      compatible = "qemu,trace-component", "riscv,trace-component";
+      reg = <0xc000000 0x1000>;
+      cpu = <&CPU0>;
+      out-ports {
+        port {
+          CPU0_ENCODER_OUTPUT: endpoint {
+            remote-endpoint = <&CPU0_RAMSINK_INPUT>;
+          };
+        };
+      };
+    };
+
+    ramsink@...1000 {
+      compatible = "qemu,trace-component", "riscv,trace-component";
+      reg = <0xc001000 0x1000>;
+      cpu = <&CPU0>;
+      in-ports {
+        port {
+          CPU0_RAMSINK_INPUT: endpoint {
+          };
+        };
+      };
+    };
+
+    encoder@...2000 {
+      compatible = "qemu,trace-component", "riscv,trace-component";
+      reg = <0xc002000 0x1000>;
+      cpu = <&CPU1>;
+      out-ports {
+        port {
+          CPU1_ENCODER_OUTPUT: endpoint {
+            remote-endpoint = <&CPU1_RAMSINK_INPUT>;
+          };
+        };
+      };
+    };
+
+    ramsink@...3000 {
+      compatible = "qemu,trace-component", "riscv,trace-component";
+      reg = <0xc003000 0x1000>;
+      cpu = <&CPU1>;
+      in-ports {
+        port {
+          CPU1_RAMSINK_INPUT: endpoint {
+          };
+        };
+      };
+    };
+
+...
-- 
2.43.0