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realtek: rtl931x: psx28: specify POE MCU reset GPIO

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The MCU (GD32E230G8) which controls the RTL8239 POE++ PSE chips can
sometimes hang. In this case, it is necessary to to reset the chip using
the nRESET pin which is connected to the GPIO1 of the RTL8231 GPIO
expander.

For a reset, the `/sys/class/gpio/poe_mcu_reset/value` file must be set to
1 for a short period and then back to 0. After that, the poemgr must be
"restarted" to the MCU back in the expected state.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Link: https://github.com/openwrt/openwrt/pull/22916
Signed-off-by: Robert Marko <robimarko@gmail.com>
This commit is contained in:
Sven Eckelmann 2026-04-13 16:21:22 +02:00 committed by Robert Marko
parent f7ec0bbb29
commit 39beab3c55
1 changed files with 10 additions and 0 deletions
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10
target/linux/realtek/dts/rtl9312_plasmacloud_psx28.dts
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@ -14,6 +14,16 @@
gpios = <&gpio1 28 GPIO_ACTIVE_LOW>;
};
};
gpio-export {
compatible = "gpio-export";
poe_mcu_reset {
gpio-export,name = "poe_mcu_reset";
gpio-export,output = <1>;
gpios = <&gpio1 29 GPIO_ACTIVE_LOW>;
};
};
};
&i2c_mst1 {