[PATCH v2 1/9] dt-bindings: arm: Add support for DSB element
Suzuki K Poulose
suzuki.poulose at arm.com
Mon Feb 27 02:44:28 PST 2023
On 27/02/2023 03:07, Tao Zhang wrote:
> Hi Suzuki,
>
> 在 2/22/2023 2:11 AM, Suzuki K Poulose 写道:
>> On 19/01/2023 07:41, Tao Zhang wrote:
>>> Add property "qcom,dsb-elem-size" to support DSB(Discrete Single
>>> Bit) element for TPDA. Specifies the DSB element size supported
>>> by each monitor connected to the aggregator on each port. Should
>>> be specified in pairs (port, dsb element size).
>>>
>>> Signed-off-by: Tao Zhang <quic_taozha at quicinc.com>
>>> Signed-off-by: Tao Zhang <taozha at qti.qualcomm.com>
>>> ---
>>> .../bindings/arm/qcom,coresight-tpda.yaml | 22
>>> ++++++++++++++++++++++
>>> 1 file changed, 22 insertions(+)
>>>
>>> diff --git
>>> a/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml
>>> b/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml
>>> index 2ec9b5b..298db7f 100644
>>> --- a/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml
>>> +++ b/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml
>>> @@ -58,6 +58,26 @@ properties:
>>> minItems: 1
>>> maxItems: 2
>>> + qcom,dsb-element-size:
>>> + description: |
>>> + Specifies the DSB(Discrete Single Bit) element size supported by
>>> + each monitor connected to the aggregator on each port. Should be
>>> + specified in pairs <port, dsb element size>.
>>
>> Isn't this a property of the TPDM connected to the port ? i.e. the DSB
>> size ? Thus shouldn't this be part of the TPDM device (and the TPDA
>> will be able to find it from the TPDM device) ?
>>
> Since the port number is about the input port of TPDA, this property
> needs to be configured in the TPDA-related settings.
That is because, you chose to describe the property of TPDM in TPDA ?
Instead if you do it as follows :
tpdm {
qcom,tpdm-dsb-elemenet-size = <32>
out_ports {
port {
remote-endpoint=<&tpda_port_number>;
}
}
tpda {
in_ports {
port {
remote-endpoint=<&tpdm0_port0>;
}
}
}
The TPDA driver can figure out the "port" that a given TPDM is connected
to and thus find out the DSB size. For the tpda driver, pdata->conns
could hold the reference to the TPDM device and thus fetch the DSB size.
(Note: James is working on a patch to add input port connections to the
platform data).
Suzuki
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