Caution
If you're looking for Microchip MCP3008 linux kernel module - use upstream mcp320x module instead.
This module is strictly for learning purposes!
Device Tree section for MCP3008 module, make sure to put it into appropriate SPI section:
mcp3008: adc@0 {
compatible = "microchip,mcp3008";
vref_supply = <&vcc3v3_sys>;
reg = <0x0>;
};