STM32 serial can be reset via reset controller.
Add the support of reset to uart nodes on stm32mp15x.

Signed-off-by: Patrick Delaunay <patrick.delau...@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 1279589a56..39591ec202 100644
--- a/arch/arm/dts/stm32mp15-u-boot.dtsi
+++ b/arch/arm/dts/stm32mp15-u-boot.dtsi
@@ -175,6 +175,38 @@
        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";
 };
-- 
2.17.1

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