Rock3/hardware/3c/gpio

GPIO number	Function5	Function4	Function3	Function2	Function1	Pin#	Pin#	Function1	Function2	Function3	Function4	Function5	GPIO number
					+3.3V	1	2	+5.0V
32		CAN1_RX_M0	I2C3_SDA_M0	UART3_RX_M0	GPIO1_A0	3	4	+5.0V
33		CAN1_TX_M0	I2C3_SCL_M0	UART3_TX_M0	GPIO1_A1	5	6	GND
116		PWM14_M0			GPIO3_C4	7	8	GPIO0_D1	UART2_TX_M0				25
					GND	9	10	GPIO0_D0	UART2_RX_M0				24
97					GPIO3_A1	11	12	GPIO3_A3				I2S3_SCLK_M0	99
98		I2S3_MCLK_M0			GPIO3_A2	13	14	GND
104					GPIO3_B0	15	16	GPIO3_B1	UART4_RX_M1	PWM8_M0			105
					+3.3V	17	18	GPIO3_B2	UART4_TX_M1	PWM9_M0			106
147		PWM15_IR_M1	I2S3_SCLK_M1	SPI3_MOSI_M1	GPIO4_C3	19	20	GND
149	UART9_TX_M1	PWM12_M1	I2S3_SDO_M1	SPI3_MISO_M1	GPIO4_C5	21	22	GPIO3_C1				I2S1_SDO2_M2	113
146		PWM14_M1	I2S3_MCLK_M1	SPI3_CLK_M1	GPIO4_C2	23	24	GPIO4_C6	SPI3_CS0_M1	PWM13_M1	UART9_RX_M1	I2S3_SDI_M1	150
					GND	25	26	GPIO4_D1	SPI3_CS1_M1				153
138		I2C4_SDA_M0	I2S2_SDI_M1		GPIO4_B2	27	28	GPIO4_B3			I2C4_SCL_M0	I2S2_SDO_M1	139
107					GPIO3_B3	29	30	GND
108					GPIO3_B4	31	32	GPIO3_C2	UART5_TX_M1			I2S1_SDO3_M2	114
115	UART5_RX_M1		I2S1_SCLK_RX_M2		GPIO3_C3	33	34	GND
100			I2S3_LRCK_M0		GPIO3_A4	35	36	GPIO3_A7					103
36			I2S1_SCLK_RX_M0		GPIO1_A4	37	38	GPIO3_A6				I2S3_SDI_M0	102
					GND	39	40	GPIO3_A5				I2S3_SDO_M0	101

Rockchip RK3566 GPIO has 5 banks, GPIO0 to GPIO4, each bank has 32pins, naming as below:

GPIO0_A0 ~ A7 
GPIO0_B0 ~ B7
GPIO0_C0 ~ C7
GPIO0_D0 ~ D7
   
GPIO1_A0 ~ A7
....
GPIO1_D0 ~ D7

For Rockchip 4.19 kernel, the GPIO number can be calculated as below, take GPIO4_A7 (PIN26 on 40-PIN HEADER) as an example:

GPIO4_A7 = 4*32 + 0*8 + 7 = 135
(A=0, B=1, C=2, D=3)

To set GPIO4_A7 output

cd /sys/class/gpio

echo 135 > export
cd gpio135
echo out > direction
echo 1 > value     # output high

echo 0 > value # output low