Hi,
Assuming that you have an eTPU function set that contains the GPIO function, using the provided functions (fs_etpu_gpio_init, fs_etpu_gpio_output_high, fs_etpu_gpio_output_low) should be straight forward.
Don't forget to initialize and start the eTPU using my_system_etpu_init() and my_system_etpu_start().
If you don't have a function set, then looking into the eTPU Site at
http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=eTPU&;nodeId=018rH3YTLC00M9
you will see the link to generate one.
HTH
Stamatis