From 43e2d1dd47a7e9b126659dc17a10f351e49bc53b Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Sat, 22 Aug 2020 22:45:36 +0200 Subject: [PATCH] ARM: dts: stm32: Pull UART4 RX high on AV96 There is no dedicated pull resistor on the AV96 UART4 (console UART) pin. In case there is no UART adapter installed on the AV96, the line is floating and can trigger reception of garbage characters, which in turn can abort U-Boot autoboot. Add default pull up to mitigate this problem. Signed-off-by: Marek Vasut Cc: Patrick Delaunay Cc: Patrice Chotard Reviewed-by: Patrick Delaunay --- arch/arm/dts/stm32mp15xx-dhcor-avenger96-u-boot.dtsi | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm/dts/stm32mp15xx-dhcor-avenger96-u-boot.dtsi b/arch/arm/dts/stm32mp15xx-dhcor-avenger96-u-boot.dtsi index cb92fc9..1ae57e1 100644 --- a/arch/arm/dts/stm32mp15xx-dhcor-avenger96-u-boot.dtsi +++ b/arch/arm/dts/stm32mp15xx-dhcor-avenger96-u-boot.dtsi @@ -75,6 +75,8 @@ }; pins2 { u-boot,dm-pre-reloc; + /delete-property/ bias-disable; + bias-pull-up; }; }; -- 2.7.4