1.\" 2.\" Copyright (c) 2025 Stephen Hurd <shurd@freebsd.org> 3.\" 4.\" SPDX-License-Identifier: BSD-2-Clause 5.\" 6.Dd March 18, 2025 7.Dt RK_GRF_GPIO 4 8.Os 9.Sh NAME 10.Nm rk_grf_gpio 11.Nd RockChip GPIO_MUTE pin driver 12.Sh SYNOPSIS 13.Cd "options SOC_ROCKCHIP_rk3328" 14.Sh DESCRIPTION 15The 16.Nm 17driver provides a single-pin, output-only 18.Xr gpio 3 19unit whose single pin is named GPIO_MUTE. 20This controls the output of the GPIO_MUTE pin on the SoC. 21.Pp 22This gpio is usually used to control another device on the board, 23so is not usually available for user software. 24.Sh HARDWARE 25The 26.Nm 27driver supports the following GRF GPIO controller: 28.Pp 29.Bl -bullet -compact 30.It 31rockchip,rk3328-grf-gpio 32.El 33.Sh HISTORY 34The 35.Nm 36driver first appeared in 37.Fx 15.0 . 38.Sh AUTHORS 39The 40.Nm 41driver and manual were written by 42.An Stephen Hurd Aq Mt shurd@freebsd.org . 43