From: Eugen Hristev eugen.hristev@microchip.com
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@vger.kernel.org # v5.15+ Signed-off-by: Eugen Hristev eugen.hristev@microchip.com Reviewed-by: Tudor Ambarus tudor.ambarus@microchip.com Signed-off-by: Nicolas Ferre nicolas.ferre@microchip.com Link: https://lore.kernel.org/r/20220307113827.2419331-1-eugen.hristev@microchip.c... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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 {