From 7acda7eae544992147850f1f9cbb903aaa3af34d Mon Sep 17 00:00:00 2001 From: Patrick Delaunay Date: Tue, 30 Jul 2019 19:16:18 +0200 Subject: [PATCH] ARM: dts: stm32mp1: add pull-up on serial rx of console connected to STLINK Avoid U-Boot auto-boot interruption for line break detection on console when the RX line connected to STLINK is floating (-IO error in getc cause by framing error and testc return 1) Same workaround is applied on all the STMicroelectonics board. Signed-off-by: Patrick Delaunay --- arch/arm/dts/stm32mp157a-dk1-u-boot.dtsi | 2 ++ arch/arm/dts/stm32mp157c-ed1-u-boot.dtsi | 2 ++ 2 files changed, 4 insertions(+) diff --git a/arch/arm/dts/stm32mp157a-dk1-u-boot.dtsi b/arch/arm/dts/stm32mp157a-dk1-u-boot.dtsi index 2a1cfd37e9..dcaab3eef2 100644 --- a/arch/arm/dts/stm32mp157a-dk1-u-boot.dtsi +++ b/arch/arm/dts/stm32mp157a-dk1-u-boot.dtsi @@ -189,6 +189,8 @@ }; pins2 { u-boot,dm-pre-reloc; + /* pull-up on rx to avoid floating level */ + bias-pull-up; }; }; diff --git a/arch/arm/dts/stm32mp157c-ed1-u-boot.dtsi b/arch/arm/dts/stm32mp157c-ed1-u-boot.dtsi index 200601edff..21c89c1ea2 100644 --- a/arch/arm/dts/stm32mp157c-ed1-u-boot.dtsi +++ b/arch/arm/dts/stm32mp157c-ed1-u-boot.dtsi @@ -206,5 +206,7 @@ }; pins2 { u-boot,dm-pre-reloc; + /* pull-up on rx to avoid floating level */ + bias-pull-up; }; };