Custom Device Tree Overlay for MCP23017 via i2c-ao

[Troy_Wood]

MCP23008 Device Tree Overlay and Driver for Raspbian

I’ve enabled the i2c-a0 bus and now I’m trying to add support for my MCP23008 GPIO expander on the bus at address 0x23: $ ls -al /sys/class/i2c-dev/ total 0 drwxr-xr-x 2 root root 0 Dec 31 1969 . drwxr-xr-x 88 root root 0 Dec 31 1969 .. lrwxrwxrwx 1 root root 0 Dec 31 1969 i2c-0 -> ../../devices/platform/soc/c8100000.bus/c8100500.i2c/i2c-0/i2c-dev/i2c-0 lrwxrwxrwx 1 root root 0 Oct 24 11:05 i2c-1 -> ../../devices/platform/soc/c883a000.hdmi-tx/i2c-1/i2c-dev/i2c-1 $ i2cdetect -y 0 0 …