tools: Add a simple tool to read/write/decode dpcd registers

This tool serves as a wrapper around the constructs provided by the
drm_dpcd_aux_dev kernel module by working on the /dev/drm_dp_aux[n]
devices created by the kernel module.
It supports reading and writing dpcd registers on the connected aux
channels.
In the follow-up patch, support for decoding these registers will be
added to facilate debugging panel related issues.

v2: (Fixes by Rodrigo but no functional changes yet):
    - Indentations, Typo, Missed spaces
    - Removing mentioning to decode and spec that is not implemented yet.
    - Add Makefile.sources back
    - Missed s/printf/igt_warn

v3:
    - Address DK's review comments from v2 above.
    - Squash Rodrigo's file handling unification patch.
    - Make count, offset and device id optional.

v4:
    - Better error handling and refactoring.

Suggested-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: Tarun Vyas <tarun.vyas@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>

0 files changed, 0 insertions, 0 deletions