[PATCH v3 0/4] soundwire: debugfs support for 5.4

[Pierre-Louis Bossart]

This patchset enables debugfs support and corrects all the feedback
provided on an earlier RFC ('soundwire: updates for 5.4')

There is one remaining hard-coded value in intel.c that will need to
be fixed in a follow-up patchset not specific to debugfs: we need to
remove hard-coded Intel-specific configurations from cadence_master.c
(PDI offsets, etc).

Changes since v2:
No code change, just rebase to soundwire/next
Added GKH and Sanyog's tags 
Also added patch4 submitted earlier in another series which depends on
debugfs

Changes since v1 (Feedback from GKH)
Handle debugfs in a more self-contained way (no dentry as return or parameter)
Used CONFIG_DEBUG_FS in structures and code to make it easier to
remove if need be.
No functional change for register dumps.

Changes since RFC (Feedback from GKH, Vinod, Guennadi, Cezary, Sanyog):
removed error checks
used DEFINE_SHOW_ATTRIBUTE and seq_file
fixed copyright dates
fixed SPDX license info to use GPL2.0 only
fixed Makefile to include debugfs only if CONFIG_DEBUG_FS is selected
used static inlines for fallback compilation
removed intermediate variables
removed hard-coded constants in loops (used registers offsets and
hardware capabilities)
squashed patch 3

Pierre-Louis Bossart (4):
  soundwire: add debugfs support
  soundwire: cadence_master: add debugfs register dump
  soundwire: intel: add debugfs register dump
  soundwire: intel: handle disabled links

 drivers/soundwire/Makefile         |   4 +
 drivers/soundwire/bus.c            |   6 ++
 drivers/soundwire/bus.h            |  16 +++
 drivers/soundwire/bus_type.c       |   3 +
 drivers/soundwire/cadence_master.c | 107 ++++++++++++++++++++
 drivers/soundwire/cadence_master.h |   4 +
 drivers/soundwire/debugfs.c        | 151 +++++++++++++++++++++++++++++
 drivers/soundwire/intel.c          | 145 ++++++++++++++++++++++++++-
 drivers/soundwire/slave.c          |   1 +
 include/linux/soundwire/sdw.h      |  10 ++
 10 files changed, 444 insertions(+), 3 deletions(-)
 create mode 100644 drivers/soundwire/debugfs.c


base-commit: 183c7687802e4132eb782808a8bf80689a9219c1
-- 
2.20.1