linux-kernel - Re: [PATCH v2 1/3] dt-bindings: arm: qcom: Add Coresight Interconnect TNOC

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Message-ID: <60628e3d-0a59-453e-acb3-acfc6dfe62af@oss.qualcomm.com>
Date: Wed, 20 Aug 2025 14:24:33 +0800
From: yuanfang zhang <yuanfang.zhang@....qualcomm.com>
To: Rob Herring <robh@...nel.org>
Cc: Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        James Clark <james.clark@...aro.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        kernel@....qualcomm.com, coresight@...ts.linaro.org,
        linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] dt-bindings: arm: qcom: Add Coresight Interconnect
 TNOC



On 8/20/2025 3:45 AM, Rob Herring wrote:
> On Tue, Aug 19, 2025 at 03:27:43AM -0700, Yuanfang Zhang wrote:
>> Add device tree binding for Qualcomm Coresight Interconnect Trace
>> Network On Chip (ITNOC). This TNOC acts as a CoreSight
>> graph link that forwards trace data from a subsystem to the
>> Aggregator TNOC, without aggregation or ATID functionality.
>>
>> Signed-off-by: Yuanfang Zhang <yuanfang.zhang@....qualcomm.com>
>> ---
>>  .../bindings/arm/qcom,coresight-itnoc.yaml         | 96 ++++++++++++++++++++++
>>  1 file changed, 96 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/arm/qcom,coresight-itnoc.yaml b/Documentation/devicetree/bindings/arm/qcom,coresight-itnoc.yaml
>> new file mode 100644
>> index 0000000000000000000000000000000000000000..a3b5f2b949f69617a014d0ae2831c9c767178f8c
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/arm/qcom,coresight-itnoc.yaml
>> @@ -0,0 +1,96 @@
>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/arm/qcom,coresight-itnoc.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Qualcomm Interconnect Trace Network On Chip - ITNOC
>> +
>> +maintainers:
>> +  - Yuanfang Zhang <yuanfang.zhang@....qualcomm.com>
>> +
>> +description:
>> +  The Interconnect TNOC is a CoreSight graph link that forwards trace data
>> +  from a subsystem to the Aggregator TNOC. Compared to Aggregator TNOC, it
>> +  does not have aggregation and ATID functionality.
>> +
>> +properties:
>> +  $nodename:
>> +    pattern: "^itnoc(@[0-9a-f]+)?$"
>> +
>> +  compatible:
>> +    const: qcom,coresight-itnoc
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  clocks:
>> +    maxItems: 1
>> +
>> +  clock-names:
>> +    items:
>> +      - const: apb
>> +
>> +  in-ports:
>> +    $ref: /schemas/graph.yaml#/properties/ports
> 
>> +    properties:
>> +      '#address-cells':
>> +        const: 1
>> +      '#size-cells':
>> +        const: 0
> 
> Drop these. Already defined by the above ref.
> 
sure, will update.
>> +
>> +    patternProperties:
>> +      '^port(@[0-9a-f]{1,2})?$':
>> +        description: Input connections from CoreSight Trace Bus
>> +        $ref: /schemas/graph.yaml#/properties/port
>> +
>> +  out-ports:
>> +    $ref: /schemas/graph.yaml#/properties/ports
>> +    additionalProperties: false
>> +
>> +    properties:
>> +      port:
>> +        description: out connections to aggregator TNOC
>> +        $ref: /schemas/graph.yaml#/properties/port
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - clocks
>> +  - clock-names
>> +  - in-ports
>> +  - out-ports
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    itnoc@...ac000 {
>> +        compatible = "qcom,coresight-itnoc";
>> +        reg = <0x109ac000 0x1000>;
>> +
>> +        clocks = <&aoss_qmp>;
>> +        clock-names = "apb";
>> +
>> +        in-ports {
>> +            #address-cells = <1>;
>> +            #size-cells = <0>;
>> +            port@0 {
>> +                reg = <0>;
>> +                tn_ic_in_tpdm_dcc: endpoint {
>> +                    remote-endpoint = <&tpdm_dcc_out_tn_ic>;
>> +                };
>> +            };
>> +        };
>> +
>> +        out-ports {
>> +            port {
>> +                tn_ic_out_tnoc_aggr: endpoint {
>> +                    /* to Aggregator TNOC input */
>> +                    remote-endpoint = <&tn_ag_in_tn_ic>;
>> +                };
>> +            };
>> +        };
>> +    };
>> +...
>>
>> -- 
>> 2.34.1
>>