Re: [PATCH v2 2/3] dt-bindings: arm: Convert CoreSight bindings to DT schema

[Suzuki K Poulose <suzuki.poulose@arm.com>]

On 27/06/2022 21:11, Rob Herring wrote:
> On Mon, Jun 20, 2022 at 06:17:20PM +0100, Suzuki K Poulose wrote:
>> Hi Rob
>>
>> A big Thank You for the effort ! A minor comment below.
>>
>> On 03/06/2022 02:19, Rob Herring wrote:
>>> Each CoreSight component has slightly different requirements and
>>> nothing applies to every component, so each CoreSight component has its
>>> own schema document.
>>>
>>> Signed-off-by: Rob Herring <robh@kernel.org>
>>> --
>>> v2:
>>>    - Add missing arm,coresight-dynamic-replicator.yaml and
>>>      arm,coresight-static-funnel.yaml
>>>    - Update MAINTAINERS
>>>    - Fix coresight.txt references
>>>    - Fix double blank line
>>> ---
>>>    .../bindings/arm/arm,coresight-catu.yaml      | 101 +++++
>>>    .../bindings/arm/arm,coresight-cti.yaml       |   3 +-
>>>    .../arm/arm,coresight-dynamic-funnel.yaml     | 126 ++++++
>>>    .../arm/arm,coresight-dynamic-replicator.yaml | 126 ++++++
>>>    .../bindings/arm/arm,coresight-etb10.yaml     |  92 ++++
>>>    .../bindings/arm/arm,coresight-etm.yaml       | 156 +++++++
>>>    .../arm/arm,coresight-static-funnel.yaml      |  89 ++++
>>>    .../arm/arm,coresight-static-replicator.yaml  |  90 ++++
>>>    .../bindings/arm/arm,coresight-stm.yaml       | 101 +++++
>>>    .../bindings/arm/arm,coresight-tmc.yaml       | 131 ++++++
>>>    .../bindings/arm/arm,coresight-tpiu.yaml      |  91 ++++
>>>    .../arm/arm,embedded-trace-extension.yaml     |   1 -
>>>    .../devicetree/bindings/arm/coresight.txt     | 402 ------------------
>>>    Documentation/trace/coresight/coresight.rst   |   2 +-
>>>    MAINTAINERS                                   |   3 +-
>>>    15 files changed, 1106 insertions(+), 408 deletions(-)
>>>    create mode 100644 Documentation/devicetree/bindings/arm/arm,coresight-catu.yaml
>>>    create mode 100644 Documentation/devicetree/bindings/arm/arm,coresight-dynamic-funnel.yaml
>>>    create mode 100644 Documentation/devicetree/bindings/arm/arm,coresight-dynamic-replicator.yaml
>>>    create mode 100644 Documentation/devicetree/bindings/arm/arm,coresight-etb10.yaml
>>>    create mode 100644 Documentation/devicetree/bindings/arm/arm,coresight-etm.yaml
>>>    create mode 100644 Documentation/devicetree/bindings/arm/arm,coresight-static-funnel.yaml
>>>    create mode 100644 Documentation/devicetree/bindings/arm/arm,coresight-static-replicator.yaml
>>>    create mode 100644 Documentation/devicetree/bindings/arm/arm,coresight-stm.yaml
>>>    create mode 100644 Documentation/devicetree/bindings/arm/arm,coresight-tmc.yaml
>>>    create mode 100644 Documentation/devicetree/bindings/arm/arm,coresight-tpiu.yaml
>>>    delete mode 100644 Documentation/devicetree/bindings/arm/coresight.txt
>>>
>>
>> ...
>>
>>> diff --git a/Documentation/devicetree/bindings/arm/arm,coresight-etm.yaml b/Documentation/devicetree/bindings/arm/arm,coresight-etm.yaml
>>> new file mode 100644
>>> index 000000000000..e0377ce48537
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/arm/arm,coresight-etm.yaml
>>> @@ -0,0 +1,156 @@
>>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/arm/arm,coresight-etm.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Arm CoreSight Embedded Trace MacroCell
>>> +
>>> +maintainers:
>>> +  - Mathieu Poirier <mathieu.poirier@linaro.org>
>>> +  - Mike Leach <mike.leach@linaro.org>
>>> +  - Leo Yan <leo.yan@linaro.org>
>>> +  - Suzuki K Poulose <suzuki.poulose@arm.com>
>>> +
>>> +description: |
>>> +  CoreSight components are compliant with the ARM CoreSight architecture
>>> +  specification and can be connected in various topologies to suit a particular
>>> +  SoCs tracing needs. These trace components can generally be classified as
>>> +  sinks, links and sources. Trace data produced by one or more sources flows
>>> +  through the intermediate links connecting the source to the currently selected
>>> +  sink.
>>> +
>>> +  The Embedded Trace Macrocell (ETM) is a real-time trace module providing
>>> +  instruction and data tracing of a processor.
>>> +
>>> +select:
>>> +  properties:
>>> +    compatible:
>>> +      contains:
>>> +        enum:
>>> +          - arm,coresight-etm3x
>>> +          - arm,coresight-etm4x
>>> +          - arm,coresight-etm4x-sysreg
>>> +  required:
>>> +    - compatible
>>> +
>>> +allOf:
>>> +  - if:
>>> +      not:
>>> +        properties:
>>> +          compatible:
>>> +            contains:
>>> +              const: arm,coresight-etm4x-sysreg
>>> +    then:
>>> +      $ref: /schemas/arm/primecell.yaml#
>>> +      required:
>>> +        - reg
> 
> 
> ^^^^
> 
>>> +
>>> +properties:
>>> +  compatible:
>>> +    oneOf:
>>> +      - description:
>>> +          Embedded Trace Macrocell with memory mapped access.
>>> +        items:
>>> +          - enum:
>>> +              - arm,coresight-etm3x
>>> +              - arm,coresight-etm4x
>>> +          - const: arm,primecell
>>> +      - description:
>>> +          Embedded Trace Macrocell (version 4.x), with system register access only
>>> +        const: arm,coresight-etm4x-sysreg
>>> +
>>> +  reg:
>>> +    maxItems: 1
>>
>> The register field is mandatory for everything, except
>> arm,coresight-etm4x-sysreg. Is there a way to enforce that
>> selectively for the others ?
> 
> Yes, that's what it is doing up above that I flagged.
> 

Thanks for the claritification.

...

>>> diff --git a/Documentation/devicetree/bindings/arm/arm,coresight-stm.yaml b/Documentation/devicetree/bindings/arm/arm,coresight-stm.yaml
>>> new file mode 100644
>>> index 000000000000..905008faa012
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/arm/arm,coresight-stm.yaml
>>> @@ -0,0 +1,101 @@
>>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/arm/arm,coresight-stm.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Arm CoreSight System Trace MacroCell
>>> +
>>> +maintainers:
>>> +  - Mathieu Poirier <mathieu.poirier@linaro.org>
>>> +  - Mike Leach <mike.leach@linaro.org>
>>> +  - Leo Yan <leo.yan@linaro.org>
>>> +  - Suzuki K Poulose <suzuki.poulose@arm.com>
>>> +
>>> +description: |
>>> +  CoreSight components are compliant with the ARM CoreSight architecture
>>> +  specification and can be connected in various topologies to suit a particular
>>> +  SoCs tracing needs. These trace components can generally be classified as
>>> +  sinks, links and sources. Trace data produced by one or more sources flows
>>> +  through the intermediate links connecting the source to the currently selected
>>> +  sink.
>>> +
>>> +  The STM is a trace source that is integrated into a CoreSight system, designed
>>> +  primarily for high-bandwidth trace of instrumentation embedded into software.
>>> +  This instrumentation is made up of memory-mapped writes to the STM Advanced
>>> +  eXtensible Interface (AXI) slave, which carry information about the behavior
>>> +  of the software.
>>> +
>>> +select:
>>> +  properties:
>>> +    compatible:
>>> +      contains:
>>> +        const: arm,coresight-stm
>>> +  required:
>>> +    - compatible
>>> +
>>> +allOf:
>>> +  - $ref: /schemas/arm/primecell.yaml#
>>> +
>>> +properties:
>>> +  compatible:
>>> +    items:
>>> +      - const: arm,coresight-stm
>>> +      - const: arm,primecell
>>> +
>>> +  reg:
>>> +    maxItems: 2
>>
>> stm-stimulus-base is mandatory for stm. So I believe, we should add
>>
>> 	minItems: 2
>> above ?
> 
> That's the default if not explicit.

Ok. So, with the above explanation, ( with gratitude )

Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>

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