---
name: "sxirsb"
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/sxirsb"
---

# sxirsb(4)

Allwinner Reduced Serial Bus controller

## NAME

**sxirsb** – Allwinner Reduced Serial Bus controller

## SYNOPSIS

**sxirsb\* at fdt?**

## DESCRIPTION

The **sxirsb** driver provides support for the Reduced Serial Bus (RSB) controller integrated on Allwinner A23/A33/A64/A80/A83T SoCs. RSB is a two-wire bus developed by X-Powers as a high-speed alternative to I2C for connecting integrated circuits. It is typically used for connecting devices such as power management ICs and audio codecs.

## SEE ALSO

[acrtc(4)](/acrtc/4.md), [iic(4)](/iic/4.md), [intro(4)](/intro/4.md)

## HISTORY

The **sxirsb** driver first appeared in OpenBSD 6.3.

## AUTHORS

The **sxirsb** driver was written by Mark Kettenis ⟨*kettenis@openbsd.org*⟩.