How to use GPIO RK3568

Configuration

The RK3568 bank/bit notation for GPIOs must be formed as "GPIO<GPIO_bank>_<gpio_bit>" 

The numeric value of GPIO is calculated as follows:

32 x (gpio_bank) + gpio_bit

gpio_bit : A0～A7 0-7 B0～B7 8-15 C0～C7 16-23 D0～D7 24-31

E.g. GPIO3_A0 becomes 96

RSB-4810

GPIO Number	GPIO formed	Numeric Representation
GPIO1	GPIO3_A0	96
GPIO2	GPIO3_A2	98
GPIO3	GPIO3_A3	99
GPIO4	GPIO3_A4	100
GPIO5	GPIO3_A5	101
GPIO6	GPIO3_A6	102

KEDGE-350

GPIO Number	GPIO formed	Numeric Representation
GPIO1	GPIO0_B0	8
GPIO2	GPIO3_A2	98
GPIO3	GPIO3_A3	99
GPIO4	GPIO3_A4	100
GPIO5	GPIO3_A5	101
GPIO6	GPIO3_A6	102
UIO_GPIO2	GPIO0_B3	11
UIO_GPIO4	GPIO0_B4	12
UIO_GPIO5	GPIO0_B5	13
UIO_GPIO6	GPIO0_B6	14
UIO_GPIO7	GPIO0_C5	21
UIO_GPIO8	GPIO0_C6	22
UIO_GPIO9	GPIO4_C3	147
UIO_GPIO10	GPIO4_C2	146
UIO_GPIO11	IIC_GPIO_P0	503
UIO_GPIO12	IIC_GPIO_P1	504

ROM-5880

GPIO Number	GPIO formed	Numeric Representation
GPIO0	GPIO2_D0	88
GPIO1	GPIO2_D1	89
GPIO2	GPIO2_D2	90
GPIO3	GPIO2_D3	91
GPIO4	GPIO2_C6	86
GPIO5	GPIO3_A1	97
GPIO6	GPIO3_A7	103
GPIO7	GPIO3_B0	104
GPIO8	GPIO3_B1	105
GPIO9	GPIO3_B2	106
GPIO10	GPIO3_B3	107
GPIO11	GPIO3_B4	108

EBC-RB07

GPIO Number	GPIO formed	Numeric Representation
GPIO1	GPIO3_A0	96
GPIO2	GPIO3_A2	98
GPIO3	GPIO3_A3	99
GPIO4	GPIO3_A4	100
GPIO5	GPIO3_A5	101
GPIO6	GPIO3_A6	102

Test

Here we take GPIO1 of 4810 as an example.

Export GPIO then you can use control GPIO from userr space through sysfs

Export GPIO1

# echo 96 > /sys/class/gpio/export

Set GPIO direction to in/out

# echo "out" > /sys/class/gpio/gpio96/direction

Set GPIO value 0/1 if GPIO pin define is output

#  echo 1 > /sys/class/gpio/gpio96/value

Used as IRQ signal

Note:You have to configure GPIO to input

#  echo "rising" > /sys/class/gpio/gpio96/edge

• rising: Trigger on rising edge
• falling: Trigger on falling edge
• both: Trigger on both edges
• none: Disable interrupt on both edges

Unexport GPIO1

# echo 96 > /sys/class/gpio/unexport

Test

GPIO1 and GPIO2 are taken as an example:

• Connect GPIO1 and GPIO2
• Export GPIO1 and GPIO2

# echo 96 > /sys/class/gpio/export
# echo 98 > /sys/class/gpio/export

• Set GPIO 1 to output

# echo "out" > /sys/class/gpio/gpio96/direction

• Set GPIO 2 to input

# echo "in" > /sys/class/gpio/gpio98/direction

• Change GPIO1 to 1 and read GPIO2value

# echo 1 > /sys/class/gpio/gpio96/value
# cat /sys/class/gpio/gpio98/value 
1

• Change GPIO1 to 0 and read GPIO2 value

# echo 0 > /sys/class/gpio/gpio96/value
# cat /sys/class/gpio/gpio98/value 
0