From 43e2d1dd47a7e9b126659dc17a10f351e49bc53b Mon Sep 17 00:00:00 2001
From: Marek Vasut <marex@denx.de>
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 <marex@denx.de>
Cc: Patrick Delaunay <patrick.delaunay@st.com>
Cc: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@st.com>
---
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 cb92fc9c141..1ae57e18542 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;
};
};
--
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