Funnel can support multi-port output in our hardware design. Since original funnels only support a single output connection, the code needs to be modified to support this new feature. The following is a typical topology diagram of multi-port output of the funnels. |---------| |---------| |---------| |---------| |---------| | TPDM0 | | TPDM1 | | TPDM2 | | TPDM3 | | TPDM4 | |---------| |---------| |---------| |---------| |---------| | | | | | | | | | | | | | | | |-----| |-----| |-----| |-----| | | | | | | | | | | | [0]| |[1] [0]| |[1] | -------------/ -------------/ -------------/ \ FUNNEL0 / \ FUNNEL1 / \ FUNNEL2 / ----------- ----------- ----------- [0]| |[1] [0]| |[1] | | |---------- | | | | | | | | |-------| | |------- | | |--------- | | | | | | | | | | | [0]| |[1] |[2] |[3] |[4] \ ---------------------------------------------------/ \ TPDA0 / \ / ------------------------------------------------ For example, TPDM0 and TPDM1 are connected to the [0] and [1] input ports of the funnel respectively, and output from the [0] and [1] output ports. In this way, when data is output from the Funnel's output port, it needs to know the source component corresponding to this output port. Our solution is to add a property named "label" in the devicetree to mark the source corresponding to the output port. After introducing this new feature, another new problem also needs to be solved. For example, TPDA driver will search for all the TPDMs on a input port. In the topology diagram above, when TPDA searches for TPDM from the input port[0], it will find TPDM0 and TPDM1. Our solution is to add a new property named "qcom,tpda-input-port" to mark the input port number of the TPDA in the devicetree.
Tao Zhang (4): dt-bindings: arm: qcom,coresight-funnel: Add label for multi-ouput coresight: Add support for multiple output ports on the funnel dt-bindings: arm: qcom,coresight-tpdm: Mark tpda input port number coresight-tpda: Add support multi-port input on TPDA
.../arm/arm,coresight-dynamic-funnel.yaml | 34 +++++++- .../bindings/arm/qcom,coresight-tpdm.yaml | 8 ++ drivers/hwtracing/coresight/coresight-core.c | 81 ++++++++++++++++--- .../hwtracing/coresight/coresight-platform.c | 5 ++ drivers/hwtracing/coresight/coresight-tpda.c | 27 ++++++- include/linux/coresight.h | 2 + 6 files changed, 139 insertions(+), 18 deletions(-)