src/sys/dev/rccgpio, branch releng/12.2

Fix rcc_gpio_modify_bits(). Obviously (1 << 0) is not the same as 0.

2016-12-31T02:23:15+00:00

Pointy hat to:	loos
MFC after:	3 days

Fix off-by-one bugs.

2015-09-07T21:59:11+00:00

While here, only set the GPIO pin state for output pins.

Pointy hat to:	loos
Sponsored by:	Rubicon Communications (Netgate)

Add the GPIO driver for the ADI Engineering RCC-VE and RCC-DFF/DFFv2.

2015-08-18T21:05:56+00:00

This driver allows read the software reset switch state and control the
status LEDs.

The GPIO pins have their direction (input/output) locked down to prevent
possible short circuits.

Note that most people get a reset button that is a hardware reset.  The
software reset button is available on boards from Netgate.

Sponsored by:	Rubicon Communications (Netgate)