From: Suzuki K Poulose <suzuki.poulose@arm.com>
To: maz@kernel.org, mathieu.poirier@linaro.org
Cc: coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, anshuman.khandual@arm.com,
mike.leach@linaro.org, catalin.marinas@arm.com, will@kernel.org,
peterz@infradead.org, leo.yan@linaro.org, robh@kernel.org,
Suzuki K Poulose <suzuki.poulose@arm.com>,
devicetree@vger.kernel.org
Subject: [PATCH v6 14/20] dts: bindings: Document device tree bindings for ETE
Date: Mon, 5 Apr 2021 17:43:01 +0100 [thread overview]
Message-ID: <20210405164307.1720226-15-suzuki.poulose@arm.com> (raw)
In-Reply-To: <20210405164307.1720226-1-suzuki.poulose@arm.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@vger.kernel.org
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
.../devicetree/bindings/arm/ete.yaml | 75 +++++++++++++++++++
MAINTAINERS | 1 +
2 files changed, 76 insertions(+)
create mode 100644 Documentation/devicetree/bindings/arm/ete.yaml
diff --git a/Documentation/devicetree/bindings/arm/ete.yaml b/Documentation/devicetree/bindings/arm/ete.yaml
new file mode 100644
index 000000000000..7f9b2d1e1147
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/ete.yaml
@@ -0,0 +1,75 @@
+# SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause
+# Copyright 2021, Arm Ltd
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/arm/ete.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: ARM Embedded Trace Extensions
+
+maintainers:
+ - Suzuki K Poulose <suzuki.poulose@arm.com>
+ - Mathieu Poirier <mathieu.poirier@linaro.org>
+
+description: |
+ Arm Embedded Trace Extension(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.
+
+properties:
+ $nodename:
+ pattern: "^ete([0-9a-f]+)$"
+ compatible:
+ items:
+ - const: arm,embedded-trace-extension
+
+ cpu:
+ description: |
+ Handle to the cpu this ETE is bound to.
+ $ref: /schemas/types.yaml#/definitions/phandle
+
+ out-ports:
+ description: |
+ Output connections from the ETE to legacy CoreSight trace bus.
+ $ref: /schemas/graph.yaml#/properties/ports
+ properties:
+ port:
+ description: Output connection from the ETE to legacy CoreSight Trace bus.
+ $ref: /schemas/graph.yaml#/properties/port
+
+required:
+ - compatible
+ - cpu
+
+additionalProperties: false
+
+examples:
+
+# An ETE node without legacy CoreSight connections
+ - |
+ ete0 {
+ compatible = "arm,embedded-trace-extension";
+ cpu = <&cpu_0>;
+ };
+# An ETE node with legacy CoreSight connections
+ - |
+ ete1 {
+ compatible = "arm,embedded-trace-extension";
+ cpu = <&cpu_1>;
+
+ out-ports { /* legacy coresight connection */
+ port {
+ ete1_out_port: endpoint {
+ remote-endpoint = <&funnel_in_port0>;
+ };
+ };
+ };
+ };
+
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index aa84121c5611..2a20a36c724a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1761,6 +1761,7 @@ F: Documentation/ABI/testing/sysfs-bus-coresight-devices-*
F: Documentation/devicetree/bindings/arm/coresight-cpu-debug.txt
F: Documentation/devicetree/bindings/arm/coresight-cti.yaml
F: Documentation/devicetree/bindings/arm/coresight.txt
+F: Documentation/devicetree/bindings/arm/ete.yaml
F: Documentation/trace/coresight/*
F: drivers/hwtracing/coresight/*
F: include/dt-bindings/arm/coresight-cti-dt.h
--
2.24.1
next prev parent reply other threads:[~2021-04-05 16:44 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-05 16:42 [PATCH v6 00/20] coresight: Add support for ETE and TRBE Suzuki K Poulose
2021-04-05 16:42 ` [PATCH v6 01/20] perf: aux: Add flags for the buffer format Suzuki K Poulose
2021-04-05 16:42 ` [PATCH v6 02/20] perf: aux: Add CoreSight PMU buffer formats Suzuki K Poulose
2021-04-05 16:42 ` [PATCH v6 03/20] arm64: Add support for trace synchronization barrier Suzuki K Poulose
2021-04-05 16:42 ` [PATCH v6 04/20] arm64: Add TRBE definitions Suzuki K Poulose
2021-04-05 16:42 ` [PATCH v6 05/20] kvm: arm64: Handle access to TRFCR_EL1 Suzuki K Poulose
2021-04-05 16:42 ` [PATCH v6 06/20] kvm: arm64: Move SPE availability check to VCPU load Suzuki K Poulose
2021-04-08 15:14 ` Alexandru Elisei
2021-04-05 16:42 ` [PATCH v6 07/20] arm64: kvm: Enable access to TRBE support for host Suzuki K Poulose
2021-04-05 16:42 ` [PATCH v6 08/20] coresight: etm4x: Move ETM to prohibited region for disable Suzuki K Poulose
2021-04-05 16:42 ` [PATCH v6 09/20] coresight: etm-perf: Allow an event to use different sinks Suzuki K Poulose
2021-04-05 16:42 ` [PATCH v6 10/20] coresight: Do not scan for graph if none is present Suzuki K Poulose
2021-04-05 16:42 ` [PATCH v6 11/20] coresight: etm4x: Add support for PE OS lock Suzuki K Poulose
2021-04-05 16:42 ` [PATCH v6 12/20] coresight: ete: Add support for ETE sysreg access Suzuki K Poulose
2021-04-05 16:43 ` [PATCH v6 13/20] coresight: ete: Add support for ETE tracing Suzuki K Poulose
2021-04-05 16:43 ` Suzuki K Poulose [this message]
2021-04-05 16:43 ` [PATCH v6 15/20] coresight: etm-perf: Handle stale output handles Suzuki K Poulose
2021-04-05 16:43 ` [PATCH v6 16/20] coresight: core: Add support for dedicated percpu sinks Suzuki K Poulose
2021-04-05 16:43 ` [PATCH v6 17/20] coresight: sink: Add TRBE driver Suzuki K Poulose
2021-04-05 16:43 ` [PATCH v6 18/20] Documentation: coresight: trbe: Sysfs ABI description Suzuki K Poulose
2021-04-05 16:43 ` [PATCH v6 19/20] Documentation: trace: Add documentation for TRBE Suzuki K Poulose
2021-04-05 16:43 ` [PATCH v6 20/20] dts: bindings: Document device tree bindings for Arm TRBE Suzuki K Poulose
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