LLDP a vendor-neutral link layer protocol used by network devices
for advertising their identity, capabilities, and neighbors.
Implements a transmit-only nodes, the node only transmit periodically
and doesn't process any LLDPUD.

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

This introduces "mode abscal", that forces a gm-lookalike mode in the
node, to send sync once per second. See "absolute calibration" document
by Peter Jansweijer from nikhef. The option is Kconfig'd, but on by
default.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Conflicts:
	ppsi

both "sec" and "hwrs->sec" are 64 bits wide: don't forcibly trim
to 31 bit the value being assigned.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

This is a logic &, not an aritmetic one. So "&&" not "&".  The change
has no effect, because the two operands are verified to always be 0 or
1, but what we had was conceptually wrong and forced me to verify.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

the configuration written to WB registers using commands in the
wr-streamers tools is used to override the default configuration
set with generics. one can enable/disable this overriding, meaning
that the original default configuration can be effective again.
this functions enables/disables overriding.

- for the qtag configuration to be effective, an appropriate override
  bit needs to be set, this was missing, fixed
- the function was first enabling the qtag-ing and then configuring it,
  this is not a good behavior, it is better to be enabled later (when
  the configuration is set, otherwise it will start sending frames
  tagged with some random config), fixed

these commands are not critical for the current release, the fix will take
some time, the codebase is good. let's make it work later

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>