[PATCH] ARM: dts: stm32: Pull UART4 RX high on AV96

[Patrick DELAUNAY]

Hi Marek,

> From: Marek Vasut <marex at denx.de>
> Sent: samedi 22 août 2020 22:46
> 
> 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 at denx.de>
> Cc: Patrick Delaunay <patrick.delaunay at st.com>
> Cc: Patrice Chotard <patrice.chotard at 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 cb92fc9c14..1ae57e1854 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;
>  	};
>  };
> 
> --
> 2.28.0

Reviewed-by: Patrick Delaunay <patrick.delaunay at st.com>

Applied to u-boot-stm/master, thanks!

Thanks

Patrick