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 <[email protected]>

diff --git a/arch/arm/dts/stm32mp157a-dk1-u-boot.dtsi b/arch/arm/dts/stm32mp157a-dk1-u-boot.dtsi
index 2a1cfd37e95ce24554b3e5a1a7c4b1a6bcb3f731..dcaab3eef2f2783c908cd192d5d3f98f956a151b 100644 (file)
--- 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 200601edff66e4836ffeded9d79f6267bd63a140..21c89c1ea26a2496b54661686687655236970e37 100644 (file)
--- 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;
        };
 };