Hi Eugene,

use in_/out_ accessors, not pointers. Look at other 4xx drivers (i2c, 
emac)

Also, you don't have worry about this code being non-portable, because 
every chip has it's own GPIO impl anyway.

Thanks for the feedback.

I haven't looked for it yet, but do you know if there is a driver
for the Yosemite board I2C temperature sensor already written?

If its not, that might be a nice little exercise for me.

Thanks,
Dave