---
name: "rk_grf_gpio"
section: "4"
platform: "freebsd"
package: "base"
version: "16.0-CURRENT-20261027-61c70dc16a79"
release: "FreeBSD 16.0-CURRENT (2026-10-27)"
platforms: ["freebsd"]
url: "https://new.carta.tech/rk_grf_gpio"
---

# rk\_grf\_gpio(4)

RockChip GPIO\_MUTE pin driver

Part of [rk\_grf\_gpio(4)](/rk_grf_gpio/4.md).

## NAME

**rk\_grf\_gpio** – RockChip GPIO\_MUTE pin driver

## SYNOPSIS

**options SOC\_ROCKCHIP\_rk3328**

## DESCRIPTION

The **rk\_grf\_gpio** driver provides a single-pin, output-only [gpio(3)](/gpio/3.md) unit whose single pin is named GPIO\_MUTE. This controls the output of the GPIO\_MUTE pin on the SoC.

This gpio is usually used to control another device on the board, so is not usually available for user software.

## HARDWARE

The **rk\_grf\_gpio** driver supports the following GRF GPIO controller:

- rockchip,rk3328-grf-gpio

## HISTORY

The **rk\_grf\_gpio** driver first appeared in FreeBSD 15.0.

## AUTHORS

The **rk\_grf\_gpio** driver and manual were written by Stephen Hurd ⟨*shurd@FreeBSD.org*⟩.