MuntsOS Embedded Linux Extra Device Tree Overlays

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`AD5593R.dts`	`2069`	`Feb 1 21:42:41 2024`
`ADAC_Click.dts`	`11`	`Sep 12 13:04:50 2025`
`ADC3_Click.dts`	`11`	`Sep 12 13:04:50 2025`
`ADC_Click_Socket1.dts`	`1039`	`Sep 13 06:35:23 2025`
`ADC_Click_Socket2.dts`	`1039`	`Sep 13 06:35:23 2025`
`ADC_DAC_Pi_Zero.dts`	`1387`	`Sep 12 13:04:50 2025`
`ADC_Pi_Zero.dts`	`897`	`Sep 15 21:23:10 2025`
`ADS1015.dts`	`2606`	`Jan 26 13:39:32 2024`
`Altitude_Click.dts`	`11`	`Sep 15 21:23:10 2025`
`Analog_Zero_MCP3008.dts`	`1041`	`Sep 10 10:05:24 2025`
`Analog_Zero_MCP3208.dts`	`1041`	`Sep 10 10:05:24 2025`
`Automation_pHAT.dts`	`2749`	`Sep 12 13:04:50 2025`
`BME280_I2C.dts`	`399`	`Sep 15 21:23:10 2025`
`DAC_Click_Socket1.dts`	`1022`	`Sep 13 06:35:23 2025`
`DAC_Click_Socket2.dts`	`1022`	`Sep 13 06:35:23 2025`
`ENC28J60.dts`	`1083`	`Sep 15 21:23:10 2025`
`Enviro_pHAT.dts`	`2663`	`Sep 12 13:04:50 2025`
`Grove_I2C_ADC.dts`	`1062`	`Sep 13 06:35:23 2025`
`HDC1080.dts`	`342`	`Sep 15 21:23:10 2025`
`MCP23017.dts`	`864`	`Sep 15 21:23:10 2025`
`MCP3428.dts`	`397`	`Sep 15 21:23:10 2025`
`MPL3115.dts`	`354`	`Sep 15 21:23:10 2025`
`MUNTS-0018.dts`	`1290`	`Sep 6 06:19:06 2025`
`Makefile`	`1560`	`Jan 7 15:53:36 2024`
`PCA8574.dts`	`434`	`Feb 2 11:40:17 2024`
`PCA9685.dts`	`414`	`Feb 2 11:40:17 2024`
`Pi3ClickShield-pi5.dts`	`1902`	`Sep 6 22:51:53 2025`
`Pi3ClickShield.dts`	`1903`	`Sep 6 22:51:53 2025`
`Pi4ClickShield-pi4.dts`	`2663`	`Sep 6 22:51:53 2025`
`Pi4ClickShield-pi5.dts`	`2662`	`Sep 6 22:51:53 2025`
`Pmod_Hygro.dts`	`11`	`Sep 15 21:23:10 2025`
`Qwiic_ADS1015.dts`	`2736`	`Sep 12 13:04:50 2025`
`README.md`	`4503`	`Sep 6 22:55:31 2025`
`README.txt`	`3950`	`Sep 6 22:55:31 2025`
`TH02.dts`	`330`	`Sep 15 21:23:10 2025`
`TMP102.dts`	`388`	`Sep 15 21:23:10 2025`
`Thermo3_Click.dts`	`10`	`Sep 15 21:23:10 2025`
`Thermo_Click_Socket1.dts`	`455`	`Sep 15 21:23:10 2025`
`Thermo_Click_Socket2.dts`	`455`	`Sep 15 21:23:10 2025`
`W5500.dts`	`1092`	`Jan 15 18:26:01 2021`
`Weather_Click.dts`	`14`	`Sep 15 21:23:10 2025`
`disable-ethernet-pi4.dts`	`368`	`Jan 21 00:20:18 2024`
`disable-ethernet-pi5.dts`	`196`	`Jan 21 00:20:18 2024`
`pwmchip0-pi5.dts`	`454`	`Sep 15 21:23:10 2025`
`pwmchip0.dts`	`455`	`Sep 15 21:23:10 2025`

Here are some collected device tree overlays for Raspberry Pi boards that have been written from scratch or customized from the kernel source distribution for MuntsOS.

For I²C devices, the easiest way to determine the correct slave address is to run i2cdetect -y 1 before and after attaching the device and see what changes. Then you can add the proper dtoverlay command to /boot/config.txt

AD5593R Analog/Digital I/O Expander

dtoverlay=AD5593R
dtparam=mode0=1
dtparam=mode1=1
dtparam=mode2=1
dtparam=mode3=1
dtparam=mode4=1
dtparam=mode5=1
dtparam=mode6=1
dtparam=mode7=1
dtparam=offstate0=0
dtparam=offstate1=0
dtparam=offstate2=0
dtparam=offstate3=0
dtparam=offstate4=0
dtparam=offstate5=0
dtparam=offstate6=0
dtparam=offstate7=0

Mode Values

0 Unused
1 ADC
2 DAC
3 ADC and DAC
8 GPIO

Off State Values

0 Pulldown resistor
1 Output low (sinking)
2 Output high (sourcing)
3 Tri-State (high impedance)

ADC121C021 Analog to Digital Converter

dtoverlay=ADC121C021
dtparam=addr=0xNN
dtparam=min=VVVVVVV
dtparam=max=VVVVVVV

The I²C slave address may be 0x50 (default if not specified), 0x51, 0x52, 0x54, 0x55, 0x56, 0x58, 0x59, or 0x5A.

For the Grove I²C ADC module, the default address is 0x50 and the values for min and max should be 6000000 or 2 times the measured voltage, in microvolts, at pad VA.

ADS1015 Analog to Digital Converter

dtoverlay=ADS1015
dtparam=addr=0xNN
dtparam=cha_enable
dtparam=chb_enable
dtparam=chc_enable
dtparam=chd_enable
dtparam=cha_cfg=4
dtparam=chb_cfg=5
dtparam=chc_cfg=6
dtparam=chd_cfg=7
dtparam=cha_gain=0
dtparam=chb_gain=0
dtparam=chc_gain=0
dtparam=chd_gain=0

The I²C slave address may be 0x48 (default if not specified) or 0x49.

ENC28J60 Ethernet Adapter

dtoverlay=ENC28J60
dtparam=cs=N
dtparam=irq=N

The value for the SPI slave select parameter cs is 0 for spidev0.0 or 1 for spidev0.1. Default is 0.
The value for GPIO interrupt signal parameter irq must be a GPIO number. Default is 25.

The default values are correct for the GeeekPi EN28J60 HAT so both dtparam lines may be omitted. Other ENC28J60 boards such as the Mikroelektronika ETH Click will likely require cs or irq or both.

MCP23017 GPIO Expander

dtoverlay=MCP23017
dtparam=addr=0xNN
dtparam=gpiopin=N

The I²C slave address may be 0x20 (default if not specified) to 0x27.

MCP3428 Analog to Digital Converter

dtoverlay=MCP3428
dtparam=addr=0xNN

The I²C slave address may be 0x68 (default if not specified) to 0x6F.

MUNTS-0018 Raspberry Pi Tutorial I/O Board

dtoverlay=MUNTS-0018
dtparam=min=VVVVVVV
dtparam=max=VVVVVVV

You can improve the accuracy of the on-board MCP3204 ADC by setting min and max to the measured voltage, in microvolts, of the 3v3 power rail.

PCA8574 GPIO Expander

dtoverlay=PCA8574
dtparam=addr=0xNN

The I²C slave address may be 0x20 (default if not specified) to 0x27 (PCA8574, PCF8574) or 0x38 to 0x3F (PCA8574A, PCF8574A).

PCA9685 PWM Expander

dtoverlay=PCA9685
dtparam=addr=0xNN

Possible I²C slave addresses range from 0x40 (default if not specified) to 0x7F, though some of these will conflict with other devices and reserved addresses. 0x40 and 0x70 are common. This overlay does not support GPIO mode.

Pi 3 Click Shield

dtoverlay=Pi3ClickShield

Pi 4 Click Shield

dtoverlay=Pi4ClickShield

W5500 Ethernet Adapter

dtoverlay=W5500
dtparam=cs=N
dtparam=irq=N

Questions or comments to Philip Munts phil@munts.net