From: Eugen Hristev <eugen.hristev@microchip.com>
Date: Thu, 28 Jan 2021 08:14:11 +0000 (+0200)
Subject: ARM: dts: at91: sama7g5ek: enable pull-up for serial debug line
X-Git-Tag: v2025.01-rc5-pxa1908~2015^2~1
X-Git-Url: http://git.dujemihanovic.xyz/html/index.html?a=commitdiff_plain;h=5dc68b07e75d4695a554b60135d70f1847885bd2;p=u-boot.git
ARM: dts: at91: sama7g5ek: enable pull-up for serial debug line
If the serial tx/rx are floating, it can happen that bogus characters
are detected on the line at boot time. This leads to U-boot accidentally
thinking someone pressed a key to stop autoboot, thus stopping booting process.
This can happen if the serial cable is not connected. There are hardware
pull-ups on the board connected to serial cable VBUS.
To solve this when the cable is not plugged, enable internal pull-ups as well
for the tx/rx lines.
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
---
diff --git a/arch/arm/dts/sama7g5ek.dts b/arch/arm/dts/sama7g5ek.dts
index ff9c9eb45c..3a4fdd38a5 100644
--- a/arch/arm/dts/sama7g5ek.dts
+++ b/arch/arm/dts/sama7g5ek.dts
@@ -122,7 +122,7 @@
pinctrl_flx3_default: flx3_default {
pinmux = <PIN_PD16__FLEXCOM3_IO0>,
<PIN_PD17__FLEXCOM3_IO1>;
- bias-disable;
+ bias-pull-up;
};
pinctrl_sdmmc0_cmd_data_default: sdmmc0_cmd_data_default {