| BCMGPIO(4) | Device Drivers Manual | BCMGPIO(4) | 
bcmgpio —
bcmgpio0 at obio?
bcmgpio1 at obio?
gpio* at gpiobus?
bcmgpio driver supports up to two instances. Access
  to the pins is provided by the
  gpio(4) interface. The
  bcmgpio unitnumber argument
  selects the pin range. Unit 0 covers GPIO pins 0 through 31 and unit 1 covers
  pins 32 through 53. GPIO pins being used in alternate configurations are not
  available for GPIO operations.
bcmgpio driver first appeared in
  NetBSD 7.0.
bcmgpio driver was written by Frank
  Kardel
  <kardel@NetBSD.org>.
| February 17, 2017 | NetBSD 10.0 |