Extern or forward variable declaration at include/linux/pinctrl/pinctrl.h, line 25 References: drivers/pinctrl/mediatek/pinctrl-moore.c, line 30 drivers/pinctrl/mediatek/pinctrl-paris.c, line 34 drivers/pinctrl/pinconf-generic.c, line 29 drivers/pinctrl/pinconf-generic.c, line 58 drivers/pinctrl/pinctrl-lpc18xx.c, line 641 drivers/pinctrl/pinctrl-zynq.c, line 974 drivers/pinctrl/qcom/pinctrl-spmi-gpio.c, line 186 drivers/pinctrl/qcom/pinctrl-spmi-mpp.c, line 156 drivers/pinctrl/qcom/pinctrl-ssbi-gpio.c, line 107 drivers/pinctrl/qcom/pinctrl-ssbi-mpp.c, line 142 drivers/pinctrl/sprd/pinctrl-sprd.c, line 840 drivers/rtc/rtc-omap.c, line 593 include/linux/pinctrl/pinctrl.h, line 25 include/linux/pinctrl/pinctrl.h, line 141