---
name: "qccpucp"
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/qccpucp"
---

# qccpucp(4)

Qualcomm CPUCP mailbox controller

## NAME

**qccpucp** – Qualcomm CPUCP mailbox controller

## SYNOPSIS

**qccpucp\* at fdt?**

## DESCRIPTION

The **qccpucp** handles communication with the Qualcomm CPUSS Control Processor. It is used as a doorbell for CPU frequency management via [scmi(4)](/scmi/4.md) on Qualcomm Snapdragon X Elite devices.

## SEE ALSO

[intro(4)](/intro/4.md), [scmi(4)](/scmi/4.md)

## HISTORY

The **qccpucp** device driver first appeared in OpenBSD 7.7.

## AUTHORS

The **qccpucp** driver was written by Tobias Heider ⟨*tobhe@openbsd.org*⟩.