1 .. SPDX-License-Identifier: GPL-2.0 2 3 ============================= 4 Coresight Dummy Trace Module 5 ============================= 6 7 :Author: Hao Zhang <quic_hazha@quicinc.com> 8 :Date: June 2023 9 10 Introduction 11 ------------ 12 13 The Coresight dummy trace module is for the specific devices that kernel don't 14 have permission to access or configure, e.g., CoreSight TPDMs on Qualcomm 15 platforms. For these devices, a dummy driver is needed to register them as 16 Coresight devices. The module may also be used to define components that may 17 not have any programming interfaces, so that paths can be created in the driver. 18 It provides Coresight API for operations on dummy devices, such as enabling and 19 disabling them. It also provides the Coresight dummy sink/source paths for 20 debugging. 21 22 Config details 23 -------------- 24 25 There are two types of nodes, dummy sink and dummy source. These nodes 26 are available at ``/sys/bus/coresight/devices``. 27 28 Example output:: 29 30 $ ls -l /sys/bus/coresight/devices | grep dummy 31 dummy_sink0 -> ../../../devices/platform/soc@0/soc@0:sink/dummy_sink0 32 dummy_source0 -> ../../../devices/platform/soc@0/soc@0:source/dummy_source0
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.