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realtek: hog the GS1900-24E external IC reset line
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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 <simi.fischa@gmail.com>
Signed-off-by: Sander Vanheule <sander@svanheule.net>
(cherry picked from commit ba57225066)
This commit is contained in:
Sander Vanheule 2026-02-21 15:00:39 +01:00
parent 82dbd32e13
commit cdc92ce560
1 changed files with 10 additions and 0 deletions
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10
target/linux/realtek/dts/rtl8382_zyxel_gs1900-24e-a1.dts
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@ -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)