Re: [PATCH v3 0/3] coresight: add static TPDM support

[Jie Gan]

On 10/13/2025 2:11 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.

Thanks,
Jie

> Changes in V3:
> 1. rebased on next-20251010
> Link to V2 - https://lore.kernel.org/all/20250911-add_static_tpdm_support-v2-0-608559d36f74@xxxxxxxxxxxxxxxx/
>
> 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@xxxxxxxxxxxxxxxx/
>
> Signed-off-by: Jie Gan <jie.gan@xxxxxxxxxxxxxxxx>
> ---
> 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       |   9 ++
>   drivers/hwtracing/coresight/coresight-tpdm.c       | 148 ++++++++++++++++-----
>   drivers/hwtracing/coresight/coresight-tpdm.h       |   8 ++
>   5 files changed, 256 insertions(+), 37 deletions(-)
> ---
> base-commit: 2b763d4652393c90eaa771a5164502ec9dd965ae
> change-id: 20251013-add-static-tpdm-support-330b71d6d0f8
>
> Best regards,