Document the device tree bindings for Trace Buffer Extension (TRBE).
Cc: Anshuman Khandual anshuman.khandual@arm.com Cc: Mathieu Poirier mathieu.poirier@linaro.org Cc: Rob Herring robh@kernel.org Cc: devicetree@vger.kernel.org Reviewed-by: Rob Herring robh@kernel.org Signed-off-by: Suzuki K Poulose suzuki.poulose@arm.com --- .../devicetree/bindings/arm/trbe.yaml | 49 +++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 50 insertions(+) create mode 100644 Documentation/devicetree/bindings/arm/trbe.yaml
diff --git a/Documentation/devicetree/bindings/arm/trbe.yaml b/Documentation/devicetree/bindings/arm/trbe.yaml new file mode 100644 index 000000000000..4402d7bfd1fc --- /dev/null +++ b/Documentation/devicetree/bindings/arm/trbe.yaml @@ -0,0 +1,49 @@ +# SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause +# Copyright 2021, Arm Ltd +%YAML 1.2 +--- +$id: "http://devicetree.org/schemas/arm/trbe.yaml#" +$schema: "http://devicetree.org/meta-schemas/core.yaml#" + +title: ARM Trace Buffer Extensions + +maintainers: + - Anshuman Khandual anshuman.khandual@arm.com + +description: | + Arm Trace Buffer Extension (TRBE) is a per CPU component + for storing trace generated on the CPU to memory. It is + accessed via CPU system registers. The software can verify + if it is permitted to use the component by checking the + TRBIDR register. + +properties: + $nodename: + const: "trbe" + compatible: + items: + - const: arm,trace-buffer-extension + + interrupts: + description: | + Exactly 1 PPI must be listed. For heterogeneous systems where + TRBE is only supported on a subset of the CPUs, please consult + the arm,gic-v3 binding for details on describing a PPI partition. + maxItems: 1 + +required: + - compatible + - interrupts + +additionalProperties: false + +examples: + + - | + #include <dt-bindings/interrupt-controller/arm-gic.h> + + trbe { + compatible = "arm,trace-buffer-extension"; + interrupts = <GIC_PPI 15 IRQ_TYPE_LEVEL_HIGH>; + }; +... diff --git a/MAINTAINERS b/MAINTAINERS index 2a20a36c724a..471d04bb2d5e 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1762,6 +1762,7 @@ 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/devicetree/bindings/arm/trbe.yaml F: Documentation/trace/coresight/* F: drivers/hwtracing/coresight/* F: include/dt-bindings/arm/coresight-cti-dt.h