linux-kernel - Re: [PATCH v3 04/10] dt-bindings: arm: Adds CoreSight TPDM hardware definitions

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Date:   Thu, 17 Feb 2022 17:48:39 +0000
From:   Mike Leach <mike.leach@...aro.org>
To:     Mao Jinlong <quic_jinlmao@...cinc.com>
Cc:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Leo Yan <leo.yan@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Tingwei Zhang <quic_tingweiz@...cinc.com>,
        Yuanfang Zhang <quic_yuanfang@...cinc.com>,
        Tao Zhang <quic_taozha@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        Hao Zhang <quic_hazha@...cinc.com>,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v3 04/10] dt-bindings: arm: Adds CoreSight TPDM hardware definitions

Hi,

On Wed, 9 Feb 2022 at 10:57, Mao Jinlong <quic_jinlmao@...cinc.com> wrote:
>
> Adds new coresight-tpdm.yaml file describing the bindings required
> to define tpdm in the device trees.
>
> Signed-off-by: Tao Zhang <quic_taozha@...cinc.com>
> Signed-off-by: Mao Jinlong <quic_jinlmao@...cinc.com>
> ---
>  .../bindings/arm/coresight-tpdm.yaml          | 81 +++++++++++++++++++
>  .../devicetree/bindings/arm/coresight.txt     |  7 ++
>  MAINTAINERS                                   |  1 +
>  3 files changed, 89 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm/coresight-tpdm.yaml
>
> diff --git a/Documentation/devicetree/bindings/arm/coresight-tpdm.yaml b/Documentation/devicetree/bindings/arm/coresight-tpdm.yaml
> new file mode 100644
> index 000000000000..7ebc1bf7abc2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/coresight-tpdm.yaml
> @@ -0,0 +1,81 @@
> +# SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause
> +# Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/arm/coresight-tpdm.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Trace, Profiling and Diagnostics Monitor - TPDM
> +
> +description: |
> +  The TPDM or Monitor serves as data collection component for various dataset
> +  types specified in the QPMDA spec. It covers Implementation defined ((ImplDef),
> +  Basic Counts (BC), Tenure Counts (TC), Continuous Multi-Bit (CMB), and Discrete
> +  Single Bit (DSB). It performs data collection in the data producing clock
> +  domain and transfers it to the data collection time domain, generally ATB
> +  clock domain.
> +
> +  The primary use case of the TPDM is to collect data from different data
> +  sources and send it to a TPDA for packetization, timestamping, and funneling.
> +
> +maintainers:
> +  - Suzuki K Poulose <suzuki.poulose@....com>
> +  - Mathieu Poirier <mathieu.poirier@...aro.org>
> +
> +properties:
> +  $nodename:
> +    pattern: "^tpdm(@[0-9a-f]+)$"
> +  compatible:
> +    items:
> +      - const: qcom,coresight-tpdm
> +      - const: arm,primecell
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  clock-names:
> +   items:
> +     - const: apb_pclk
> +
> +  out-ports:
> +    description: |
> +      Output connections from the TPDM to legacy CoreSight trace bus.
> +    $ref: /schemas/graph.yaml#/properties/ports
> +    properties:
> +      port:
> +        description: Output connection from the TPDM to legacy CoreSight
> +          Trace bus.
> +        $ref: /schemas/graph.yaml#/properties/port
> +

As we discussed in patch 0/10 of this set - the TDPM actually sends
data to TDPA - not to coresight. These descriptions should match that.

> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +
> +additionalProperties: false
> +
> +examples:
> +  # minimum TPDM definition.
> +  - |
> +    tpdm@...0000 {
> +      compatible = "qcom,coresight-tpdm", "arm,primecell";
> +      reg = <0x6980000 0x1000>;
> +
> +      clocks = <&aoss_qmp>;
> +      clock-names = "apb_pclk";
> +
> +      out-ports {
> +        port {
> +          tpdm_turing_out_funnel_turing: endpoint {
> +            remote-endpoint =
> +              <&funnel_turing_in_tpdm_turing>;
> +          };
> +        };
> +      };
> +    };
> +

example looks OK, but I would like to see something of a _tdpa in the
nameing as that is the funnel / link the tdpm sends data to.

Regards

Mike

> +...
> diff --git a/Documentation/devicetree/bindings/arm/coresight.txt b/Documentation/devicetree/bindings/arm/coresight.txt
> index c68d93a35b6c..f7ce8af48574 100644
> --- a/Documentation/devicetree/bindings/arm/coresight.txt
> +++ b/Documentation/devicetree/bindings/arm/coresight.txt
> @@ -52,6 +52,10 @@ its hardware characteristcs.
>                         "arm,coresight-cti", "arm,primecell";
>                         See coresight-cti.yaml for full CTI definitions.
>
> +               - Trace, Profiling and Diagnostics Monitor (TPDM):
> +                       "qcom,coresight-tpdm", "arm,primecell";
> +                       See coresight-tpdm.yaml for full TPDM definitions.
> +
>         * reg: physical base address and length of the register
>           set(s) of the component.
>
> @@ -82,6 +86,9 @@ its hardware characteristcs.
>  * Required properties for Coresight Cross Trigger Interface (CTI)
>         See coresight-cti.yaml for full CTI definitions.
>
> +* Required properties for Trace, Profiling and Diagnostics Monitor (TPDM)
> +       See coresight-tpdm.yaml for full TPDM definitions.
> +
>  * Required properties for devices that don't show up on the AMBA bus, such as
>    non-configurable replicators and non-configurable funnels:
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index ea3e6c914384..434bbe98d22b 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1906,6 +1906,7 @@ T:        git git://git.kernel.org/pub/scm/linux/kernel/git/coresight/linux.git
>  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-tpdm.yaml
>  F:     Documentation/devicetree/bindings/arm/coresight.txt
>  F:     Documentation/devicetree/bindings/arm/ete.yaml
>  F:     Documentation/devicetree/bindings/arm/trbe.yaml
> --
> 2.17.1
>


-- 
Mike Leach
Principal Engineer, ARM Ltd.
Manchester Design Centre. UK