sunxi-DT-overlays

These are some example overlays for the niche devices (i.e. IIO sensors), custom sensor boards with multiple devices on them or devices that require customization by end user (i.e. SPI displays and touch screens)

Compared to the other ones in this repository these are "standalone" - no fixup script is required, so they can be used with the configfs interface too.

double-spidev.dts

overlay for 2 SPIdev devices on 1 SPI bus
requires activating the SPI bus by a kernel provided overlay (i.e. overlays=spi0)
requires using SPI bus that supports multiple chip selects (including software/GPIO based ones)
requires spi-add-cs1 overlay on H3 and H5

gpio-button.dts

overlay for a GPIO button, active low (when connected to GND), using either EINT capable GPIO pin or polling
bindings documentation: gpio-keys.txt, gpio-keys-polled.txt
internal pull-up is optional and not recommended unless using short wires
requires adding poll-interval property if using "gpio-keys-polled" driver

i2c-apds9960.dts

overlay for an apds9960 sensor connected to the I2C bus
bindings documentation: apds9960.txt
requires activating the I2C bus the device is connected to by a kernel provided overlay (i.e. overlays=i2c1)
may require changing the interrupt GPIO specifier
using external pull-up resistor on the interrupt line is highly recommended if the module doesn't have one

i2c-edt-ft5x06.dts

overlay for a touch screen connected to the I2C bus
bindings documentation: edt-ft5x06.txt
requires activating the I2C bus the device is connected to by a kernel provided overlay (i.e. overlays=i2c1)
may require changing the compatible property value even though currently it's not required
may require changing or removing wake and reset GPIOs
may require changing the interrupt GPIO specifier

i2c-ina219.dts

overlay for a INA219 current shunt and power monitor connected to the I2C bus
bindings documentation: ina2xx.txt
requires activating the I2C bus the device is connected to by a kernel provided overlay (i.e. overlays=i2c1)
may require changing the compatible property value
may require changing the reg property value to the actual address of the chip
may require changing the shunt-resistor depending on board resistor

i2c-pca857x.dts

overlay for a PCA8574 GPIO/interrupt controller connected to the I2C bus
bindings documentation: gpio-pcf857x.txt
requires activating the I2C bus the device is connected to by a kernel provided overlay (i.e. overlays=i2c0)
may require changing the compatible property value
may require changing the reg property value to the actual address of the chip
may require changing the interrupt GPIO specifier

sht1x.dts

overlay for a Sensirion SHT1x sensor connected to 2 GPIO lines
bindings documentation: sht15.txt

spi-ads7846.dts

overlay for an ADS7846 touch screen connected to the SPI0 controller on H3 based board
bindings documentation: ads7846.txt
may require activating the SPI bus device is connected to by a kernel provided overlays (i.e. overlays=spi0)
may require changing the compatible property value even though currently it's not required
may require adding wake GPIO
may require changing the interrupt GPIO specifier

spi-enc28j60

overlays for a ENC28J60 Ethernet controller connected to the SPI bus
bindings documentation: microchip,enc28j60.txt
may require activating the SPI bus device is connected to by a kernel provided overlays (i.e. overlays=spi0)
may require changing the interrupt GPIO specifier
using external pull-up resistor on the interrupt line is highly recommended if the module doesn't have one

spi-mcp251x

overlays for a MCP251x CAN controller connected to the SPI bus
bindings documentation: microchip,mcp251x.txt
may require activating the SPI bus device is connected to by a kernel provided overlays (i.e. overlays=spi0)
may require changing the compatible property value
may require changing the interrupt GPIO specifier
may require changing the clock frequency to an actual value of the onboard resonator
using external pull-up resistor on the interrupt line is highly recommended if the module doesn't have one