On Wed, Oct 29, 2008 at 06:07:47PM -0700, Trent Piepho wrote:
[...]

But, I'm using the GPIOs to bit-bang a JTAG bus in the 20-30 MHz range.  The
obvious GPIO driver is *much* too slow for that.  I got less than 3 MHz, and
your driver looks like it might be slightly slower than my initial driver.

You can implement rapid (inlined) SOC-specific versions of
gpio_{get,set}_value() functions. And they can co-exist with the
gpiolib. It is quite easy to do.

-- 
Anton Vorontsov
email: cbouatmailru@gmail.com
irc://irc.freenode.net/bd2