---
name: "pcagpio"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["openbsd"]
url: "https://new.carta.tech/pcagpio"
---

# pcagpio(4)

Philips PCA955\[4567\] GPIO controller

## NAME

**pcagpio** – Philips PCA955\[4567\] GPIO controller

## SYNOPSIS

**pcagpio\* at iic?** **gpio\* at pcagpio?**

## DESCRIPTION

The **pcagpio** driver provides support for the Philips PCA955\[4567\] GPIO controllers. The PCA955\[467\] devices have 8 pins and the PCA9555 device has 16 pins which can be configured as either inputs or outputs, and accessed using [gpioctl(8)](/gpioctl/8.md).

## SEE ALSO

[gpio(4)](/gpio/4.md), [iic(4)](/iic/4.md), [intro(4)](/intro/4.md), [gpioctl(8)](/gpioctl/8.md)

## HISTORY

The **pcagpio** driver first appeared in OpenBSD 3.9.

## AUTHORS

The **pcagpio** driver was written by Theo de Raadt ⟨*deraadt@openbsd.org*⟩.