[PATCH] ARM: dts: at91: sama7g5ek: enable pull-up for serial debug line

[Eugen.Hristev at microchip.com]

On 28.01.2021 10:14, Eugen Hristev wrote:
> 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 at microchip.com>
> ---
>   arch/arm/dts/sama7g5ek.dts | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> 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 {
> 

Applied to u-boot-atmel/master