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ARM: dts: amlogic: meson8: enable UART RX and TX pull up by default

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Some boards have noise on the UART RX line when the UART pins are not
connected to another device (such as an USB UART adapter). This can
be addressed by using a pull up resistor. Not all boards may provide
such a pull up resistor on the PCB so enable the SoC's pull-up on the
UART RX and TX pads by default. This matches the default (from u-boot
or SoC hardware) state for the pinmux configuration on these pads.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20250329185855.854186-2-martin.blumenstingl@googlemail.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
This commit is contained in:
Martin Blumenstingl 2025-03-29 19:58:49 +01:00 committed by Neil Armstrong
parent 0af2f6be1b
commit 3fa57cb017
1 changed files with 2 additions and 2 deletions
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4
arch/arm/boot/dts/amlogic/meson8.dtsi
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@ -398,7 +398,7 @@ uart_ao_a_pins: uart_ao_a {
mux {
groups = "uart_tx_ao_a", "uart_rx_ao_a";
function = "uart_ao";
bias-disable;
bias-pull-up;
};
};
@ -567,7 +567,7 @@ mux {
groups = "uart_tx_a1",
"uart_rx_a1";
function = "uart_a";
bias-disable;
bias-pull-up;
};
};