# # GPIO infrastructure and expanders # config HAVE_GPIO_LIB bool help Platforms select gpiolib if they use this infrastructure for all their GPIOs, usually starting with ones integrated into SOC processors. menu "GPIO Support" depends on HAVE_GPIO_LIB config DEBUG_GPIO bool "Debug GPIO calls" depends on DEBUG_KERNEL help Say Y here to add some extra checks and diagnostics to GPIO calls. The checks help ensure that GPIOs have been properly initialized before they are used and that sleeping calls aren not made from nonsleeping contexts. They can make bitbanged serial protocols slower. The diagnostics help catch the type of setup errors that are most common when setting up new platforms or boards. # put expanders in the right section, in alphabetical order comment "I2C GPIO expanders:" comment "SPI GPIO expanders:" endmenu