On 10/28/2025 6:11 PM, Jie Gan wrote:
> The static TPDM function as a dummy source, however, it is essential
> to enable the port connected to the TPDA and configure the element size.
> Without this, the TPDA cannot correctly receive trace data from the
> static TPDM. Since the static TPDM does not require MMIO mapping to
> access its registers, a clock controller is not mandatory for its
> operation.
>
> Meanwhile, a function has been introduced to determine whether the
> current csdev is a static TPDM. This check enables the TPDA device
> to correctly read the element size and activate its port accordingly.
> Otherwise the TPDA cannot receive the trace data from the TPDM device.
>
Gentle reminder.
> Changes in V4:
> 1. decouple from tpda driver code.
> 2. Introduce a new solution to identify static TPDM.
> Link to V3 - https://lore.kernel.org/all/20251013-add-static-tpdm-support-v3-0-a720b73e83db@oss.qualcomm.com/
>
> Changes in V3:
> 1. rebased on next-20251010
> Link to V2 - https://lore.kernel.org/all/20250911-add_static_tpdm_support-v2-0-608559d36f74@oss.qualcomm.com/
>
> Changes in V2:
> 1. Remove the dependency.
> 2. Collect tags from Rob and Konard for patchset 1 and patchset 3.
> Link to V1 - https://lore.kernel.org/all/20250822103008.1029-1-jie.gan@oss.qualcomm.com/
>
> Signed-off-by: Jie Gan <jie.gan@oss.qualcomm.com>
> ---
> Jie Gan (3):
> dt-bindings: arm: document the static TPDM compatible
> coresight: tpdm: add static tpdm support
> arm64: dts: qcom: lemans: enable static TPDM
>
> .../bindings/arm/qcom,coresight-tpdm.yaml | 23 ++-
> arch/arm64/boot/dts/qcom/lemans.dtsi | 105 +++++++++++++
> drivers/hwtracing/coresight/coresight-tpda.c | 7 -
> drivers/hwtracing/coresight/coresight-tpdm.c | 174 +++++++++++++++++----
> drivers/hwtracing/coresight/coresight-tpdm.h | 12 ++
> 5 files changed, 279 insertions(+), 42 deletions(-)
> ---
> base-commit: f7d2388eeec24966fc4d5cf32d706f0514f29ac5
> change-id: 20251028-add_static_tpdm_support-1f62477857e2
>
> Best regards,