From: Patrick Delaunay <patrick.delaunay@st.com>
Date: Tue, 30 Jul 2019 17:16:18 +0000 (+0200)
Subject: ARM: dts: stm32mp1: add pull-up on serial rx of console connected to STLINK
X-Git-Tag: v2019.10-rc4~31^2~50
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=7acda7eae544992147850f1f9cbb903aaa3af34d;p=oweals%2Fu-boot.git

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 <patrick.delaunay@st.com>
---

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;
 	};
 };