Re: [PATCH v4 3/5] dt-bindings: arm: Add Coresight TMC Control Unit hardware

[Rob Herring <robh@xxxxxxxxxx>]

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@xxxxxxxxxxx>
> ---
>  .../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@xxxxxxxxxxx>
> +  - Mao Jinlong <quic_jinlmao@xxxxxxxxxxx>
> +  - Jie Gan <quic_jiegan@xxxxxxxxxxx>
> +
> +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@1001000 {
> +        compatible = "qcom,sa8775p-ctcu";
> +        reg = <0x1001000 0x1000>;
> +
> +        clocks = <&aoss_qmp>;
> +        clock-names = "apb";
> +
> +        in-ports {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            port@0 {
> +                reg = <0>;
> +                ctcu_in_port0: endpoint {
> +                    remote-endpoint = <&etr0_out_port>;
> +                };
> +            };
> +
> +            port@1 {
> +                reg = <1>;
> +                ctcu_in_port1: endpoint {
> +                    remote-endpoint = <&etr1_out_port>;
> +                };
> +            };
> +        };
> +    };
> -- 
> 2.34.1
>