src/sys/dev/wbwd, branch release/13.1.0

wbwd: Mark sysctls with CTLFLAG_MPSAFE.

2021-12-24T01:05:06+00:00

MFC after:	2 weeks

(cherry picked from commit fdec27ed82ea3f6406a7089e5e1ffd99bb4929e0)

wbwd: clean up empty lines in .c and .h files

2020-09-01T21:46:58+00:00

Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (17 of many)

2020-02-26T14:26:36+00:00

r357614 added CTLFLAG_NEEDGIANT to make it easier to find nodes that are
still not MPSAFE (or already are but aren’t properly marked).
Use it in preparation for a general review of all nodes.

This is non-functional change that adds annotations to SYSCTL_NODE and
SYSCTL_PROC nodes using one of the soon-to-be-required flags.

Mark all obvious cases as MPSAFE.  All entries that haven't been marked
as MPSAFE before are by default marked as NEEDGIANT

Approved by:	kib (mentor, blanket)
Commented by:	kib, gallatin, melifaro
Differential Revision:	https://reviews.freebsd.org/D23718

wbwd: small clean-ups and improvements

2019-10-17T06:21:09+00:00

This change applies some suggestions by delphij from D21979.
A write-only variable is removed.
There is a diagnostic message if the driver does not recognize the chip.
A chained if-statement is converted to a switch.

MFC after:	3 weeks

wbwd: move to superio(4) bus

2019-10-16T14:46:04+00:00

This allows to remove a bunch of low level code.
Also, superio(4) provides safer interaction with other drivers
that work with Super I/O configuration registers.

Tested only on PCengines APU2:
superio0:  at port 0x2e-0x2f on isa0
wbwd0:  at WDT ldn 0x08 on superio0

The watchdog output is incorrectly wired on that system and the watchdog
does not really do it its job, but the pulse can be seen with a signal
analyzer.

Reviewed by:	delphij, bcr (man page)
MFC after:	19 days
Differential Revision: https://reviews.freebsd.org/D21979

Add IDs for Nuvoton NCT6793/NCT6795.

2018-01-13T16:31:07+00:00

MFC after:	2 weeks

sys/dev: further adoption of SPDX licensing ID tags.

2017-11-27T14:52:40+00:00

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

etc: minor spelling fixes.

2016-05-02T16:47:28+00:00

Mostly comments but also some user-visible strings.

MFC after:	2 weeks

sys/dev: use our nitems() macro when it is avaliable through param.h.

2016-04-19T23:37:24+00:00

No functional change, only trivial cases are done in this sweep,
Drivers that can get further enhancements will be done independently.

Discussed in:	freebsd-current

Remove watchdog timer stop check.

2016-04-14T12:50:27+00:00

There are bunch of reports that this check fails at least on Nuvoton
NCT6776 chips.  I don't see why this check needed there, and Linux does
not have it either.  So far this check only made watchdogd unstopable.

MFC after:	1 month