Function prototype or declaration at include/linux/gpio/driver.h, line 474 References: drivers/gpio/gpio-stmpe.c, line 256 drivers/gpio/gpio-wm831x.c, line 170 drivers/gpio/gpio-wm8994.c, line 203 drivers/gpio/gpiolib.c, line 834 drivers/gpio/gpiolib.c, line 2003 drivers/gpio/gpiolib.c, line 2015 drivers/pinctrl/intel/pinctrl-baytrail.c, line 1272 drivers/pinctrl/nomadik/pinctrl-abx500.c, line 453 drivers/pinctrl/nomadik/pinctrl-nomadik.c, line 918 include/linux/gpio/driver.h, line 474 include/linux/gpio/driver.h, line 487