From ba57225066243b28d2802ea5c47313c97767150e Mon Sep 17 00:00:00 2001 From: Sander Vanheule Date: Sat, 21 Feb 2026 15:00:39 +0100 Subject: [PATCH] realtek: hog the GS1900-24E external IC reset line The GPIO line connecting to the reset signals of the GS1900-24E(A1)'s external ICs (RTL8218B phys and RTL8231 expander) cannot be asserted by the MDIO subsystem, as the reset is shared between busses. To prevent users from accidentally asserting the reset line, a GPIO hog is created to permanently de-assert the signal, reliably keeping the phys and GPIO expanders on. Tested-by: Simon Fischer Signed-off-by: Sander Vanheule --- .../linux/realtek/dts/rtl8382_zyxel_gs1900-24e-a1.dts | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/target/linux/realtek/dts/rtl8382_zyxel_gs1900-24e-a1.dts b/target/linux/realtek/dts/rtl8382_zyxel_gs1900-24e-a1.dts index c54648cc32..4cffc040ed 100644 --- a/target/linux/realtek/dts/rtl8382_zyxel_gs1900-24e-a1.dts +++ b/target/linux/realtek/dts/rtl8382_zyxel_gs1900-24e-a1.dts @@ -8,6 +8,16 @@ model = "Zyxel GS1900-24E A1"; }; +&gpio0 { + /* Shared between the main and aux MDIO busses */ + mdio_reset { + gpio-hog; + gpios = <1 GPIO_ACTIVE_LOW>; + output-low; + line-name = "mdio-reset"; + }; +}; + &mdio_bus0 { EXTERNAL_PHY(0) EXTERNAL_PHY(1)