[PATCH v4 3/5] dt-bindings: arm: Add Coresight TMC Control Unit hardware
Rob Herring
robh at kernel.org
Wed Aug 28 08:12:05 PDT 2024
On Wed, Aug 28, 2024 at 09:27:04AM +0800, Jie Gan wrote:
> Add binding file to specify how to define a Coresight TMC
> Control Unit device in device tree.
>
> It is responsible for controlling the data filter function
> based on the source device's Trace ID for TMC ETR device.
> The trace data with that Trace id can get into ETR's buffer
> while other trace data gets ignored.
>
> Signed-off-by: Jie Gan <quic_jiegan at quicinc.com>
> ---
> .../bindings/arm/qcom,coresight-ctcu.yaml | 84 +++++++++++++++++++
> 1 file changed, 84 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/arm/qcom,coresight-ctcu.yaml
>
> diff --git a/Documentation/devicetree/bindings/arm/qcom,coresight-ctcu.yaml b/Documentation/devicetree/bindings/arm/qcom,coresight-ctcu.yaml
> new file mode 100644
> index 000000000000..669aac646451
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/qcom,coresight-ctcu.yaml
> @@ -0,0 +1,84 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/arm/qcom,coresight-ctcu.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: CoreSight TMC Control Unit
> +
> +maintainers:
> + - Yuanfang Zhang <quic_yuanfang at quicinc.com>
> + - Mao Jinlong <quic_jinlmao at quicinc.com>
> + - Jie Gan <quic_jiegan at quicinc.com>
> +
> +description:
You need '>' or '|' if you want to preserve paragraphs.
> + The Trace Memory Controller(TMC) is used for Embedded Trace Buffer(ETB),
> + Embedded Trace FIFO(ETF) and Embedded Trace Router(ETR) configurations.
> + The configuration mode (ETB, ETF, ETR) is discovered at boot time when
> + the device is probed.
> +
> + The Coresight TMC Control unit controls various Coresight behaviors.
> + It works as a helper device when connected to TMC ETR device.
> + It is responsible for controlling the data filter function based on
> + the source device's Trace ID for TMC ETR device. The trace data with
> + that Trace id can get into ETR's buffer while other trace data gets
> + ignored.
> +
> +properties:
> + compatible:
> + enum:
> + - qcom,sa8775p-ctcu
> +
> + reg:
> + maxItems: 1
> +
> + clocks:
> + maxItems: 1
> +
> + clock-names:
> + items:
> + - const: apb
> +
> + in-ports:
Just "ports". "in-ports" is for the case when you have "out-ports".
> + $ref: /schemas/graph.yaml#/properties/ports
> +
> + patternProperties:
> + '^port(@[0-1])?$':
> + description: Input connections from CoreSight Trace bus
> + $ref: /schemas/graph.yaml#/properties/port
> +
> +required:
> + - compatible
> + - reg
> + - in-ports
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + ctcu at 1001000 {
> + compatible = "qcom,sa8775p-ctcu";
> + reg = <0x1001000 0x1000>;
> +
> + clocks = <&aoss_qmp>;
> + clock-names = "apb";
> +
> + in-ports {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + port at 0 {
> + reg = <0>;
> + ctcu_in_port0: endpoint {
> + remote-endpoint = <&etr0_out_port>;
> + };
> + };
> +
> + port at 1 {
> + reg = <1>;
> + ctcu_in_port1: endpoint {
> + remote-endpoint = <&etr1_out_port>;
> + };
> + };
> + };
> + };
> --
> 2.34.1
>
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