linux-kernel - [PATCH 06/11] dts: bindings: Document device tree bindings for ETE

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Date:   Wed, 23 Dec 2020 15:33:38 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-arm-kernel@...ts.infradead.org, coresight@...ts.linaro.org
Cc:     linux-kernel@...r.kernel.org,
        Anshuman Khandual <anshuman.khandual@....com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Linu Cherian <lcherian@...vell.com>,
        devicetree@...r.kernel.org, Rob Herring <robh@...nel.org>
Subject: [PATCH 06/11] dts: bindings: Document device tree bindings for ETE

From: Suzuki K Poulose <suzuki.poulose@....com>

Document the device tree bindings for Embedded Trace Extensions.
ETE can be connected to legacy coresight components and thus
could optionally contain a connection graph as described by
the CoreSight bindings.

Cc: devicetree@...r.kernel.org
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Mike Leach <mike.leach@...aro.org>
Cc: Rob Herring <robh@...nel.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
 Documentation/devicetree/bindings/arm/ete.txt | 41 +++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/ete.txt

diff --git a/Documentation/devicetree/bindings/arm/ete.txt b/Documentation/devicetree/bindings/arm/ete.txt
new file mode 100644
index 0000000..b52b507
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/ete.txt
@@ -0,0 +1,41 @@
+Arm Embedded Trace Extensions
+
+Arm Embedded Trace Extensions (ETE) is a per CPU trace component that
+allows tracing the CPU execution. It overlaps with the CoreSight ETMv4
+architecture and has extended support for future architecture changes.
+The trace generated by the ETE could be stored via legacy CoreSight
+components (e.g, TMC-ETR) or other means (e.g, using a per CPU buffer
+Arm Trace Buffer Extension (TRBE)). Since the ETE can be connected to
+legacy CoreSight components, a node must be listed per instance, along
+with any optional connection graph as per the coresight bindings.
+See bindings/arm/coresight.txt.
+
+** ETE Required properties:
+
+- compatible : should be one of:
+	"arm,embedded-trace-extensions"
+
+- cpu : the CPU phandle this ETE belongs to.
+
+** Optional properties:
+- CoreSight connection graph, see bindings/arm/coresight.txt.
+
+** Example:
+
+ete_0 {
+	compatible = "arm,embedded-trace-extension";
+	cpu = <&cpu_0>;
+};
+
+ete_1 {
+	compatible = "arm,embedded-trace-extension";
+	cpu = <&cpu_1>;
+
+	out-ports {	/* legacy CoreSight connection */
+		port {
+			ete1_out_port: endpoint@0 {
+				remote-endpoint = <&funnel_in_port0>;
+			};
+		};
+	};
+};
-- 
2.7.4