gpio = <&gpio0 RK_PA6 GPIO_ACTIVE_HIGH>;
第一个参数是GPIO编号
第二个参数是GPIO引脚 一般GPIO有32个引脚 定义在 kernel-4.19\include\dt-bindings\pinctrl\rockchip.h
#define RK_GPIO0 0 #define RK_GPIO1 1 #define RK_GPIO2 2 #define RK_GPIO3 3 #define RK_GPIO4 4 #define RK_GPIO6 6 #define RK_PA0 0 #define RK_PA1 1 #define RK_PA2 2 #define RK_PA3 3 #define RK_PA4 4 #define RK_PA5 5 #define RK_PA6 6 #define RK_PA7 7 #define RK_PB0 8 #define RK_PB1 9 #define RK_PB2 10 #define RK_PB3 11 #define RK_PB4 12 #define RK_PB5 13 #define RK_PB6 14 #define RK_PB7 15 #define RK_PC0 16 #define RK_PC1 17 #define RK_PC2 18 #define RK_PC3 19 #define RK_PC4 20 #define RK_PC5 21 #define RK_PC6 22 #define RK_PC7 23 #define RK_PD0 24 #define RK_PD1 25 #define RK_PD2 26 #define RK_PD3 27 #define RK_PD4 28 #define RK_PD5 29 #define RK_PD6 30 #define RK_PD7 31 #define RK_FUNC_GPIO 0 #define RK_FUNC_0 0 #define RK_FUNC_1 1 #define RK_FUNC_2 2 #define RK_FUNC_3 3 #define RK_FUNC_4 4 #define RK_FUNC_5 5 #define RK_FUNC_6 6 #define RK_FUNC_7 7 #define RK_FUNC_8 8 #define RK_FUNC_9 9 #define RK_FUNC_10 10 #define RK_FUNC_11 11 #define RK_FUNC_12 12 #define RK_FUNC_13 13 #define RK_FUNC_14 14 #define RK_FUNC_15 15 #endif
第三个参数是引脚的电平 定义在 kernel-4.19\include\dt-bindings\gpio\gpio.h
/* Bit 0 express polarity */ #define GPIO_ACTIVE_HIGH 0 #define GPIO_ACTIVE_LOW 1 /* Bit 1 express single-endedness */ #define GPIO_PUSH_PULL 0 #define GPIO_SINGLE_ENDED 2 /* Bit 2 express Open drain or open source */ #define GPIO_LINE_OPEN_SOURCE 0 #define GPIO_LINE_OPEN_DRAIN 4 /* * Open Drain/Collector is the combination of single-ended open drain interface. * Open Source/Emitter is the combination of single-ended open source interface. */ #define GPIO_OPEN_DRAIN (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_DRAIN) #define GPIO_OPEN_SOURCE (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_SOURCE) /* Bit 3 express GPIO suspend/resume and reset persistence */ #define GPIO_PERSISTENT 0 #define GPIO_TRANSITORY 8