linux-kernel - [PATCH v6 0/4] add sysfs nodes to configure TPDA's registers

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Message-Id: <20251222-add_sysfs_nodes_to_configure_tpda-v6-0-b27143d45c86@oss.qualcomm.com>
Date: Mon, 22 Dec 2025 14:02:20 +0800
From: Jie Gan <jie.gan@....qualcomm.com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        James Clark <james.clark@...aro.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Tingwei Zhang <tingwei.zhang@....qualcomm.com>
Cc: coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Jie Gan <jie.gan@....qualcomm.com>,
        Tao Zhang <tao.zhang@....qualcomm.com>
Subject: [PATCH v6 0/4] add sysfs nodes to configure TPDA's registers

Patchset 1 introduces configuration of the global control register with
appropriate values to enable proper generation of cross-trigger packets.

Patchset 2 introduces a sysfs node for triggering global flush for all
ports.

Patchset 3 introduces a logic to configure the TPDA_SYNCR register,
which determines the frequency of ASYNC packet generation. These packets
assist userspace tools in accurately identifying each valid packet.

Patchset 4 introduces a sysfs node to initiate a flush request for the
specific port, forcing the data to synchronize and be transmitted to the
sink device.

Changes in v6:
1. Create a new patch for introducing gloabl_flush_req sysfs node.
2. Add a syncr_mode sysfs node for TPDA_SYNCR.
3. Remove the redundant attr_grp and consolidate all attributes under tpda_attr_grp.
Link to v5: https://lore.kernel.org/r/20251219-add_sysfs_nodes_to_configure_tpda-v5-0-ca93ddfe9d30@oss.qualcomm.com

Chnages in V5:
1. Optimizing the solution to creat sysfs nodes.
2. Optimizing the logic for configuring bits of the global control
   register.
Link to V4 - https://lore.kernel.org/all/20251028-configure_tpda_reg-v4-0-23000805d21d@oss.qualcomm.com/

Changes in V4:
1. Document sysfs nodes with correct kernel version and date.
Link to V3 - https://lore.kernel.org/linux-arm-kernel/20250827105545.7140-1-jie.gan@oss.qualcomm.com/

Changes in V3:
1. Optimizing codes according to James's comment.
Link to V2 - https://lore.kernel.org/all/20250827042042.6786-1-jie.gan@oss.qualcomm.com/

Changes in V2:
1. Refactoring the code based on James's comment for optimization.
Link to V1 - https://lore.kernel.org/all/20250826070150.5603-1-jie.gan@oss.qualcomm.com/

Signed-off-by: Jie Gan <jie.gan@....qualcomm.com>
---
Jie Gan (1):
      coresight: tpda: add global_flush_req sysfs node

Tao Zhang (3):
      coresight: tpda: add sysfs nodes for tpda cross-trigger configuration
      coresight: tpda: add logic to configure TPDA_SYNCR register
      coresight: tpda: add sysfs node to flush specific port

 .../ABI/testing/sysfs-bus-coresight-devices-tpda   |  60 ++++++
 drivers/hwtracing/coresight/coresight-tpda.c       | 240 ++++++++++++++++++++-
 drivers/hwtracing/coresight/coresight-tpda.h       |  74 ++++++-
 3 files changed, 367 insertions(+), 7 deletions(-)
---
base-commit: 12b95d29eb979e5c4f4f31bb05817bc935c52050
change-id: 20251219-add_sysfs_nodes_to_configure_tpda-f54636512817

Best regards,
-- 
Jie Gan <jie.gan@....qualcomm.com>