AGPIO Switch - Kernel Module for enabling MT7688 Ethernet Switch

MT7688, an SoC used in routers and Omega2, has 5-ports Ethernet switch. On Onion's Omega2(S) or Omega2(S)+ modules, this is disabled by default.

This module enables

• the Ethernet switch by modifying AGPIO_CFG resistor value.
• LEDs for each port by modifying GPIO2_CFG resistor value.

Tested on OpenWrt 22.03, with kernel version 5.10

Usage

Use a custom package collection.

TowerWrt Packages (OpenWrt Custom Packages Collection)

(alternative way) Hard-copying

• Clone this into your customizing OpenWRT root, e.g. into /package/somewhere/agpioSwitch
• comment out sdhci and pwm sections in device tree, as those pins are occupying Ethernet ports 2 and 3.
• Run make menuconfig and search agpio to see if the kmod-agpioSwitch is present, then select it.
• After building, flashing, and booting the built OpenWrt image, run dmesg | grep -i agpio to see if it's applied correctly.

root@Omega-736B:~# dmesg | grep -i agpio
[   60.140149] AGPIOSwitch: Switching MT7688 to 5 port ethernet mode...
root@Omega-736B:~#