Hello,
I am having issues getting an MCP23017 IO expander to work with with a CM4. To be more specific, while I am able to see and interact with the device on the I2C bus (using i2cdetect), even with the dtoverlay enabled the chip is not recognized by gpiodetect. In my /boot/firmware/config.txt I have the following:I have also tried using instead of i2c_vc=on with the same result.
Running sudo dmesg, I see the following lines which may be relevant:Looking at pinctrl, I also notice that GPIO2/3 are being initialized as I2C pins even though I do not set that anywhere in my device tree (which breaks my soft shutdown button):Does anyone have any idea what this might be?
I am having issues getting an MCP23017 IO expander to work with with a CM4. To be more specific, while I am able to see and interact with the device on the I2C bus (using i2cdetect), even with the dtoverlay enabled the chip is not recognized by gpiodetect. In my /boot/firmware/config.txt I have the following:
Code:
dtparam=i2c_vc=ondtoverlay=mcp23017,noints,i2c_csi_dsiCode:
dtoverlay=i2c0,pins_44_45Running sudo dmesg, I see the following lines which may be relevant:
Code:
[ 4.033692] i2c i2c-22: Added multiplexed i2c bus 0[ 4.058087] i2c i2c-22: Added multiplexed i2c bus 10[ 4.124283] mcp230xx 0-0020: prop pinctrl-0 index 0 invalid phandleCode:
2: a0 pu | hi // GPIO2 = SDA1 3: a0 pu | hi // GPIO3 = SCL1Statistics: Posted by jshapiro — Thu May 16, 2024 12:43 am