Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC r258044, r258679, r263990

Adds gpioiic.4 and gpioled.4 man pages. Moves some of the information that
was previously available on gpio.4 to their respectives pages. Add the
cross references on gpioctl.8.

Add gpiobus(4) as a link to gpio(4).

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Assume that the -f argument is /dev/gpioc0 if it is not passed.

hrs@ provided this verison of the patch and showed me where all the needed
changes were to be made outside of gpioctl.c

Approved by: re (hrs)
MFC after: 2 weeks

Add gpio(4) man page to attempt to document the current hints based setup of
pin outputs, functions and setup.

Add cross reference in gpioctl(8) for people to find.

This is by no means complete and really only covers gpioled(4) and the
Atheros based systems who expose a few extra hints at boot time.

This should be updated by developers who know more about this system than
I and viewed as the beginning of documentation, not the end.

Reviewed by: adrian
Approved by: re (joel)
MFC after: 2 weeks

Remove trailing whitespace per mdoc lint warning

Disussed with: gavin
No objection from: doc
Approved by: joel
MFC after: 3 days

Bump the date of the man page to the date of the actual commit.

Noticed by: brix

Document the device name change from gpioctl to gpioc in the
man page.

PR: docs/157075
Submitted by: brix
Reviewed by: gonzo

Remove the advertising clause from UCB copyrighted files in usr.sbin. This
is in accordance with the information provided at
ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change

mdoc: drop even more redundant .Pp calls

No change in rendered output, less mandoc lint warnings.

Tool provided by: Nobuyuki Koganemaru n-kogane at syd.odn.ne.jp

Add gpioctl(8). Utility for configuring/accessing GPIO pins