Be consistent in not marking up "GPIO".

gpioctl: implement support for "gpioctl gpioN list". Like pcictl(8).

For drivers that name their pins, this can be used to determine how the
logical pins are mapped to physical pins. Example from sunxigpio(4):

# gpioctl gpio0 list
0: PA0
1: PA1
2: PA2
...

Bump date for previous.

Document options to select alternate GPIO modes.

branches: 1.20.26;
Merge riastradh-drm2 to HEAD.

Use Mt for email addresses.

branches: 1.18.2;
Make it easier to use gpioctl(8) in shell scripts: Add a -s flag which
instructs gpioctl(8) to only output a single numeric value, either the
number of pins if no pin number was passed as argumenti, or, the current
state of the pin.

Remove stray 'To'.

branches: 1.16.6;
Fix a "lonely name".

Remove software pulsing in gpio(4), this functionality is now provided
by the gpiopwm(4) driver.

branches: 1.14.2;
Sort SEE ALSO.

Remove the GPIODETACH gpio(4) ioctl (it is still available in COMPAT_50) and
the 'detach' command line option from gpioctl(8). Drivers that are
attached to gpio pins can be detached using the drvctl(8) command.

It's actually 'the flag locator', not 'flags' (as 'flags' can not be used
as a locator name for reasons unknown to me.)

Add a ga_flags field to the gpio_attach structure to hand driver
specific flags to drivers being attached at gpio pins. gpioiic(4)
uses this to reverse the SDA/SCL signal order. gpioctl(8) accepts
the flag values as optional argument to the attach command.
While here, make sure we retain backwards compatability and wrap compat
code in #ifdef COMPAT_50/#endif.

Use Cm to mark up command arguments. Use An -nosplit to avoid linebreak in sentence.

Add a new ioctl, GPIOPULSE to gpio(4) to allow for pulsing a pin.
If a pin can pulse in hardware, that will be used, else it will
be pulsed in software. There is no way yet to set the pulse frequency
for pins that pulse in hardware. While here, make the code mpsafe and
allow more than one thread in the driver (access to ioctl is serialized).

Make some functions static, use getprogname() instead of
'extern char *__progname'.

Rename 'pulse' to 'pulsate' to make clear it is a continuous strain of
pulses and and not a single shot pulse that is emitted by devices
supporting this kind of operation.

Jonatha Kollasch has a GPIO device that can pulse the output lines.
Support it wuth the GPIO_PIN_PULSE attribute and the 'pulse' paramater
to gpioctl. Discussed with Jonathan.

Reworked gpioctl(8) command to reflect recent gpio(4) changes.

Add support for GPIO_PIN_PULLDOWN, GPIO_PIN_INVIN, GPIO_PIN_INVOUT,
from OpenBSD.

Xref gcscpcib(4).

branches: 1.2.10;
Remove default argument from .Nm. Add a missing article. Mention NetBSD import.

Import userland utility for playing with gpio devices. From OpenBSD.