From: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>
commit 3f7ce6d7091765ed6c67c5d78aa364b9d17e3aab upstream.
Flexcom3 is used as board console serial. There are no pull-ups on these
lines on the board. This means that if a cable is not connected (that has
pull-ups included), stray characters could appear on the console as the
floating pins voltage levels are interpreted as incoming characters.
To avoid this problem, enable the internal pull-ups on these lines.
Fixes: 7540629e2fc7 ("ARM: dts: at91: add sama7g5 SoC DT and sama7g5-ek")
Cc: stable@xxxxxxxxxxxxxxx # v5.15+
Signed-off-by: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>
Reviewed-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>
Signed-off-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220307113827.2419331-1-eugen.hristev@xxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/boot/dts/at91-sama7g5ek.dts | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/arm/boot/dts/at91-sama7g5ek.dts
+++ b/arch/arm/boot/dts/at91-sama7g5ek.dts
@@ -403,7 +403,7 @@
pinctrl_flx3_default: flx3_default {
pinmux = <PIN_PD16__FLEXCOM3_IO0>,
<PIN_PD17__FLEXCOM3_IO1>;
- bias-disable;
+ bias-pull-up;
};
pinctrl_flx4_default: flx4_default {
