在 9/13/2022 8:48 AM, Rob Herring 写道:
On Thu, Sep 08, 2022 at 04:44:57PM +0800, Tao Zhang wrote:
Add property "qcom,dsb-elem-size" to support DSB 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).
What is DSB?
The full name of DSB is "Discrete Single Bit".
The DSB element size supported by different DSB subunit TPDMs is different, so TPDA needs to be informed through configuration in device tree.
Signed-off-by: Tao Zhang quic_taozha@quicinc.com
Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml b/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml index eb9bfc5..1bb3fdf 100644 --- a/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml +++ b/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml @@ -40,6 +40,13 @@ properties: minItems: 1 maxItems: 2
- qcom,dsb-elem-size:
- description: |
Specifies the DSB element size supported by each monitorconnected to the aggregator on each port. Should be specifiedin pairs (port, dsb element size).- $ref: /schemas/types.yaml#/definitions/uint32-array
The binding (not yet upstream) says there is just 1 port (port 0). So why do you need more than a single uint32?
Rob
TPDA(Trace, Profiling and Diagnostics Aggregator) is to provide packetization, funneling and timestamping of TPDM data.
Multiple monitors are connected to different input ports of TPDA.
- - - - - - - - - - - - | TPDM 0| | TPDM 1 | | TPDM 2| - - - - - - - - - - - - | | | |_ _ _ _ _ _ | _ _ _ _ | | | | | | | ------------------ | TPDA | ------------------
There may be multiple DSB subunit TPDMs connected to different input ports of the same TPDA, so we need to use port here to define the distinction in device tree.
Best regards,
Tao