[Uboot-stm32] [PATCH] ARM: dts: stm32: add reset support to uart nodes on stm32mp15x

[Patrice CHOTARD <patrice.chotard@st.com>]

On 7/6/20 2:48 PM, Patrick Delaunay wrote:
> STM32 serial IP can be reset via reset controller.
> Add the support of reset to uart nodes on stm32mp15-u-boot.dtsi,
> the ad-dons file for U-Boot.
>
> This patch fix issues when previous UART configuration, for example
> done in TF-A or ROM code, is not handled in U-Boot stm32 serial driver
> init.
>
> This reset property won't be not added in Linux kernel device tree
> as this reset is not used in Linux STM32 serial driver.
>
> Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
> ---
>
>  arch/arm/dts/stm32mp15-u-boot.dtsi | 32 ++++++++++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
>
> diff --git a/arch/arm/dts/stm32mp15-u-boot.dtsi b/arch/arm/dts/stm32mp15-u-boot.dtsi
> index 142ad25c43..c463b49dda 100644
> --- a/arch/arm/dts/stm32mp15-u-boot.dtsi
> +++ b/arch/arm/dts/stm32mp15-u-boot.dtsi
> @@ -179,6 +179,38 @@
>  	compatible = "st,stm32-sdmmc2", "arm,pl18x", "arm,primecell";
>  };
>  
> +&usart1 {
> +	resets = <&rcc USART1_R>;
> +};
> +
> +&usart2 {
> +	resets = <&rcc USART2_R>;
> +};
> +
> +&usart3 {
> +	resets = <&rcc USART3_R>;
> +};
> +
> +&uart4 {
> +	resets = <&rcc UART4_R>;
> +};
> +
> +&uart5 {
> +	resets = <&rcc UART5_R>;
> +};
> +
> +&usart6 {
> +	resets = <&rcc USART6_R>;
> +};
> +
> +&uart7 {
> +	resets = <&rcc UART7_R>;
> +};
> +
> +&uart8{
> +	resets = <&rcc UART8_R>;
> +};
> +
>  &usbotg_hs {
>  	compatible = "st,stm32mp1-hsotg", "snps,dwc2";
>  };

Reviewed-by: Patrice Chotard <patrice.chotard@st.com>

Thanks

Patrice