GPIO, SPI and I2C support on Raspberry PI

[fabiodive <fabiodive%gmail.com@localhost>]

Hello all,

I would like to know if:

-GPIO
-SPI
-I2C

are supported by NetBSD on Rapberry PI.
If the kernel already support them..is there 
any user-space interface available for them?

I am working on a project where I use
all of them, interfacing my external devices
using c language.

I would like to continue to use Wiringpi library, 
anybody already have any experience
with it on NetBSD?

Thank you
Fabio Balzano