Rock3/hardware/radxa-e25-gpio

    ROCK E25 >  Hardware >  ROCK E25 GPIO

General purpose input-output (GPIO) connector

ROCK E 25 has a 10-pin expansion header.

GPIO number	Function4	Function3	Function2	Function1	Pin#
12	MCU_JTAG_TCK	PCIE20_BUTTONRSTn	CAN0_RX_M0	I2C1_SDA	1
114	I2S1_SDO3_M2	UART5_TX_M1	SPI1_MISO_M1		2
115	I2S1_SCLK_RX_M2	UART5_RX_M1	SPI1_CLK_M1		3
112	PDM_SDI3_M2	UART3_RX_M1	PWM13_M0		4
	GDD				5
33	ACODEC_ADC_CLK	CAN1_TX_M0	UART3_TX_M0	I2C3_SCL_M0	6
32	ACODEC_ADC_DATA	CAN1_RX_M0	UART3_RX_M0	I2C3_SDA_M0	7
97	SDMMC2_D0_M1	PCIE30X1_PERSTn_M1	SPI1_CS0_M1		8
129	I2S1_SDO2_M2	PCIE20_PERSTn_M1	SPI1_MOSI_M1		9
11	PCIE30X1_BUTTONRSTn	CAN0_TX_M0	I2C1_SCL		10

Rockchip RK3568 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_D1 (PIN26 on 4-0PIN HEADER) as an example:

GPIO4_D1 = 4*32 + 3*8 + 1 = 153
(A=0, B=1, C=2, D=3)

To set GPIO4_D1 output

cd /sys/class/gpio
echo 153 > export
cd gpio153
echo out > direction
echo 1 > value     # output high
echo 0 > value     # output low