=== Trace ===

echo 1 >/sys/kernel/debug/tracing/tracing_on
echo 1 >/sys/kernel/debug/tracing/events/fsl_edma/enable

Run any dma test
...

cat /sys/kernel/debug/tracing/trace

 uart_testapp_11-448     [000] d..1.    69.185019: edma_fill_tcd:
==== TCD =====
  saddr:  0x831ee020
  soff:       0x8000
  attr:       0xffff
  nbytes: 0xfba40000
  slast:  0x00000000
  daddr:  0x8aaa4800
  doff:       0x0001
  citer:      0x0800
  dlast:  0xfba40020
  csr:        0x0052
  biter:      0x0800

 uart_testapp_11-448     [000] d..2.    69.185022: edma_writew: offset 0001803c: value 00000000
 uart_testapp_11-448     [000] d..2.    69.185023: edma_writel: offset 00018020: value 4259001c
 uart_testapp_11-448     [000] d..2.    69.185024: edma_writel: offset 00018030: value 8aaa4000

=== DebugFS ===

cat /sys/kernel/debug/dmaengine/42000000.dma-controller/42000000.dma-controller-CH00/ch_sbr
0x00208003

Frank Li (2):
  dmaengine: fsl-edma: add debugfs support
  dmaengine: fsl-edma: add trace event support

 drivers/dma/Makefile           |   7 +-
 drivers/dma/fsl-edma-common.c  |   2 +
 drivers/dma/fsl-edma-common.h  |  37 ++++++++--
 drivers/dma/fsl-edma-debugfs.c | 120 +++++++++++++++++++++++++++++++++
 drivers/dma/fsl-edma-main.c    |   2 +
 drivers/dma/fsl-edma-trace.c   |   4 ++
 drivers/dma/fsl-edma-trace.h   | 113 +++++++++++++++++++++++++++++++
 7 files changed, 279 insertions(+), 6 deletions(-)
 create mode 100644 drivers/dma/fsl-edma-debugfs.c
 create mode 100644 drivers/dma/fsl-edma-trace.c
 create mode 100644 drivers/dma/fsl-edma-trace.h

-- 
2.34.1