Difference between revisions of "Device-tree-overlays"

Revision as of 10:02, 7 January 2020

Introduction of ROCK Pi Device Tree Overlays

This document describes ROCK Pi device tree overlays provided in kernel packages.

Platform and Chips

rockchip (Rockchip)

rk3399pro
rk3328

usage

Kernel provided DT overlay files are in /boot/dtbs/$(uname -r)/rockchip/overlay/

/boot/uEnv.txt contents:

 overlays=rk3399pro-i2c2 rk3399pro-console-on-uart2 rk3399pro-pwm0 rk3399pro-w1-gpio rk3399pro-spi-spidev
 param_spidev_spi_bus=1
 param_spidev_max_freq=10000000
 param_w1_pin=GPIO2_A2

Add names of overlays you want to activate to overlays= line in /boot/uEnv.txt, separated with spaces.

Add required parameters with their values to /boot/uEnv.txt, one per line.

Add optional parameters with their values to /boot/uEnv.txt if you want to change the default value, one per line.

RK3399PRO Available Overlay (ROCK Pi N10)

rk3399pro-i2c2, rk3399pro-i2c6, rk3399pro-i2c7
rk3399pro-spi-spidev
rk3399pro-pwm0, rk3399pro-pwm1
rk3399pro-uart2, rk3399pro-uart4
rk3399pro-console-on-uart2, rk3399pro-console-on-uart4
rk3399pro-w1-gpio

rk3399pro-i2c2

Activates I2C bus 2

I2C2 pins (SCL, SDA): GPIO2_A1, GPIO2_A0

Usage: add one line in /boot/uEnv.txt overlays=rk3399pro-i2c2

rk3399pro-i2c6

Activates I2C bus 6

I2C7 pins (SCL, SDA): GPIO2_B2, GPIO2_A1

rk3399pro-i2c7

Activates I2C bus 7

I2C7 pins (SCL, SDA): GPIO2_B0, GPIO2_A7

rk3399pro-spi-spidev

Activates spidev device node (/dev/spidevX.Y) for userspace SPI access, where X is the bus number and Y is the CS number

SPI 1 pins (MOSI, MISO, SCK, CS): GPIO1_B0, GPIO1_A7, GPIO1_B1, GPIO1_B2

Parameters:

param_spidev_spi_bus (int)
- SPI bus to activate SPIdev support on
- Required
- Supported values: 0, 1

param_spidev_spi_cs (int)
- SPI chip select number
- Optional
- Default: 0
- Supported values: 0, 1
- Using chip select 1 requires using "spi-add-cs1" overlay

param_spidev_max_freq (int)
- Maximum SPIdev frequency
- Optional
- Default: 10000000
- Range: 3000 - 100000000

rk3399pro-pwm0

Activates PWM0

rk3399pro-pwm1

Activates PWM1

rk3399pro-uart2

Activates serial port 2 (/dev/ttyS2)

UART2 pins (RXD, TXD): GPIO4_C3, GPIO4_C4

Notice: rk3399pro-uart2 and rk3399pro-console-on-uart2 cannnot be added together in /boot/uEnv.txt.

rk3399pro-uart4

Activates serial port 4 (/dev/ttyS4)

UART4 pins (RXD, TXD): GPIO1_A7, GPIO1_B0

Notice: UART4 cannot be activated together with SPI1 since they share the same pins. Also, rk3399pro-uart4 and rk3399pro-console-on-uart4 cannnot be added together in /boot/uEnv.txt.

rk3399pro-console-on-uart2

Activates debug console on UART2

console pins (RXD, TXD): GPIO4_C3, GPIO4_C4

Notice: rk3399pro-console-on-uart2 and rk3399pro-uart2 cannnot be added together in /boot/uEnv.txt.

rk3399pro-console-on-uart4

Activates debug console on UART4

console pins (RXD, TXD): GPIO1_A7, GPIO1_B0

Notice: rk3399pro-console-on-uart4 and rk3399pro-uart4 cannnot be added together in /boot/uEnv.txt.

rk3399pro-w1-gpio

Activates 1-Wire GPIO master

Requires an external pull-up resistor on the data pin

Parameters:

param_w1_pin (pin)
- Data pin for 1-Wire master
- Optional
- Default: GPIO2_A2

rk3399pro-raspberrypi-7-inch-lcd

Activates Raspberry Pi 7-inch LCD

Notice: In term of hardware, use a 15-pin FPC cable to connect RPI LCD to ROCK Pi N10.

For power supply, both 5V pin and GND pin on 5-pin connector on RPI LCD are connected to the 40-pin connector on ROCK Pi N10.

rk3399pro-pcie-gen2

Activates PCIe Gen2 Mode

RK3328 Available Overlay

rk3328-i2c1
rk3328-spi-spidev
rk3328-uart1, rk3328-uart2
rk3328-console-on-uart1, rk3328-console-on-uart2
rk3328-w1-gpio

rk3328-i2c1

Activates I2C bus 2

I2C2 pins (SCL, SDA): GPIO2_A1, GPIO2_A0

Usage: add one line in /boot/uEnv.txt

overlays=rk3328-i2c1

rk3328-spi-spidev

Activates spidev device node (/dev/spidevX.Y) for userspace SPI access, where X is the bus number and Y is the CS number

SPI 0 pins (MOSI, MISO, SCK, CS): GPIO3_A1, GPIO3_A2, GPIO3_A0, GPIO3_B0

Parameters:

param_spidev_spi_bus (int)
- SPI bus to activate SPIdev support on
- Required
- Supported values: 0

param_spidev_spi_cs (int)
- SPI chip select number
- Optional
- Default: 0
- Supported values: 0

param_spidev_max_freq (int)
- Maximum SPIdev frequency
- Optional
- Default: 10000000
- Range: 3000 - 100000000

rk3328-uart1

Activates serial port 1 (/dev/ttyS1)

UART1 pins (RXD, TXD): GPIO3_A6, GPIO3_A4

Notice: rk3328-uart1 and rk3328-console-on-uart1 cannnot be added together in /boot/uEnv.txt.

rk3328-uart2

Activates serial port 2 (/dev/ttyS2)

UART2 pins (RXD, TXD): GPIO2_A1, GPIO2_A0

Notice: rk3328-uart2 and rk3328-console-on-uart2 cannnot be added together in /boot/uEnv.txt.

rk3328-console-on-uart

Activates debug console on UART1

console pins (RXD, TXD): GPIO3_A6, GPIO3_A4

Notice: rk3328-console-on-uart1 and rk3328-uart1 cannnot be added together in /boot/uEnv.txt.

rk3328-console-on-uart2

Activates debug console on UART2

console pins (RXD, TXD): GPIO2_A1, GPIO2_A0

Notice: rk3328-console-on-uart2 and rk3328-uart2 cannnot be added together in /boot/uEnv.txt.

rk3328-w1-gpio

Activates 1-Wire GPIO master

Requires an external pull-up resistor on the data pin

Parameters:

param_w1_pin (pin)
- Data pin for 1-Wire master
- Optional
- Default: GPIO2_D2

@@ Line 28: / Line 28: @@
 Add optional parameters with their values to /boot/uEnv.txt if you want to change the default value, one per line.
-=== RK3399PRO Available Overlay  ===
+=== RK3399PRO Available Overlay  (ROCK Pi N10) ===
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