In our hardware design, by combining a funnel and a replicator, it
implement a hardware device with one-to-one correspondence between
output ports and input ports. The programming usage on this device
is the same as funnel. The software uses a funnel and a static
replicator to implement the driver of this device. Since original
funnels only support a single output connection and original
replicator only support a single input connection, the code needs
to be modified to support this new feature. The following is a
typical topology diagram of multi-port output mechanism.
|----------| |---------| |----------| |---------|
| TPDM 0 | | Source0 | | Source 1 | | TPDM 1 |
|----------| |---------| |----------| |---------|
| | | |
| | | |
| --------- | | |
| | | |
| | | |
| | | |
\-------------/ ---------------------- |
\ Funnel 0 / | |
----------- | ------------------------------
| | |
| | |
\------------------/
\ Funnel 1 / ----|
\--------------/ |
| |----> Combine a funnel and a
| | static replicator
/-----------------\ |
/ replicator 0 \ ----|
/---------------------\
| | |
| | |-----------|
| |---------| |
| |TPDM0 |TPDM1
| \-----------------/
| \ TPDA 0 /
| \-------------/
| |
| |
|Source0/1 |
\-------------------------------/
\ Funnel 2 /
\---------------------------/
Changes in V2:
1. Change the reference for endpoint property in dt-binding.
-- Krzysztof Kozlowski
2. Change the property name "filter_src" to "filter-src".
-- Krzysztof Kozlowski
3. Fix the errors in running 'make dt_binding_check'.
-- Rob Herring
4. Pass in the source parameter instead of path.
-- Suzuki K Poulose
5. Reset the "filter_src_dev" if the "src" csdev is being removed.
-- Suzuki K Poulose
6. Add a warning if the "filter_src_dev" is of not the
type DEV_TYPE_SOURCE.
-- Suzuki K Poulose
7. Optimize the procedure for handling all possible cases.
-- Suzuki K Poulose
Changes in V1:
1. Add a static replicator connect to a funnel to implement the
correspondence between the output ports and the input ports on
funnels.
-- Suzuki K Poulose
2. Add filter_src_dev and filter_src_dev phandle to
"coresight_connection" struct, and populate them if there is one.
-- Suzuki K Poulose
3. To look at the phandle and then fixup/remove the filter_src
device in fixup/remove connections.
-- Suzuki K Poulose
4. When TPDA reads DSB/CMB element size, it is implemented by
looking up filter src device in the connections.
-- Suzuki K Poulose
Tao Zhang (3):
dt-bindings: arm: qcom,coresight-static-replicator: Add property for
source filtering
coresight: Add source filtering for multi-port output
coresight-tpda: Optimize the function of reading element size
.../arm/arm,coresight-static-replicator.yaml | 19 ++-
drivers/hwtracing/coresight/coresight-core.c | 125 ++++++++++++++++--
.../hwtracing/coresight/coresight-platform.c | 18 +++
drivers/hwtracing/coresight/coresight-tpda.c | 3 +-
include/linux/coresight.h | 5 +
5 files changed, 155 insertions(+), 15 deletions(-)
--
2.17.1
