esphome/tests/components/mcp23017/test.esp32-c3.yaml

i2c:
  - id: i2c_mcp23017
    scl: 5
    sda: 4

mcp23017:
  id: mcp23017_hub

binary_sensor:
  - platform: gpio
    id: mcp23017_binary_sensor
    pin:
      mcp23xxx: mcp23017_hub
      number: 0
      mode: INPUT

switch:
  - platform: gpio
    id: mcp23017_switch
    pin:
      mcp23xxx: mcp23017_hub
      number: 1
      mode: OUTPUT