https://www.home-assistant.io/integrations/numato/
Numato USB GPIO Expander - Home Assistant
Instructions on how to integrate a Numato GPIO expander into Home Assistant.
gpio expandernumatousbassistant
https://lwn.net/Articles/857082/
RTL8231 GPIO expander support [LWN.net]
gpio expandersupportlwn
https://www.adafruit.com/product/5545
Adafruit PCF8574 I2C GPIO Expander Breakout [STEMMA QT / Qwiic] : Adafruit Industries, Unique & fun...
Expand your project possibilities, with the Adafruit PCF8574 GPIO Expander Breakout - an affordable 8 channel I2C expander.GPIO expanders work like this: you...
stemma qt qwiicgpio expander
https://lkml.org/lkml/2025/11/25/997
LKML: Fred Chen: [PATCH v1 1/2] ARM: dts: aspeed: santabarbara: Add swb IO expander and gpio line...