Function prototype or declaration at include/linux/gpio/driver.h, line 464 References: arch/arm/plat-orion/gpio.c, line 461 drivers/gpio/gpio-lynxpoint.c, line 418 drivers/gpio/gpio-mvebu.c, line 857 drivers/gpio/gpio-stmpe.c, line 253 drivers/gpio/gpio-wm831x.c, line 174 drivers/gpio/gpio-wm8994.c, line 207 drivers/gpio/gpio-xra1403.c, line 148 drivers/gpio/gpiolib.c, line 2956 drivers/gpio/gpiolib.c, line 2969 drivers/pinctrl/intel/pinctrl-baytrail.c, line 1274 drivers/pinctrl/nomadik/pinctrl-abx500.c, line 456 drivers/pinctrl/nomadik/pinctrl-nomadik.c, line 937 drivers/pinctrl/pinctrl-at91.c, line 1383 drivers/pinctrl/pinctrl-mcp23s08.c, line 747 drivers/pwm/pwm-pca9685.c, line 132 include/linux/gpio/driver.h, line 464 include/linux/gpio/driver.h, line 477