zephyr/tests/drivers/pinmux
..
src
Makefile
prj_arduino_101.conf
prj_arduino_due.conf
prj_frdm_k64f.conf
prj_galileo.conf
prj_nucleo_f103rb.conf
prj_olimexino_stm32.conf
prj_quark_d2000_crb.conf
prj_quark_se_c1000_devboard.conf
prj_stm32_mini_a15.conf
README.txt
testcase.ini

This is simply to build pinmux drivers to catch build breakage.

The source code comes from samples/hello_world.