Add support for UART8 by applying the settings specified in the
reference manual RM0433.

Signed-off-by: Dario Binacchi <dario.binac...@amarulasolutions.com>
Link: 
https://lore.kernel.org/r/20250427074404.3278732-6-dario.binac...@amarulasolutions.com
Signed-off-by: Alexandre Torgue <alexandre.tor...@foss.st.com>

[ upstream commit: 07aa43adae2363c3734055aeba0789536fa0f8f2 ]

---

 dts/upstream/src/arm/st/stm32h743.dtsi | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/dts/upstream/src/arm/st/stm32h743.dtsi 
b/dts/upstream/src/arm/st/stm32h743.dtsi
index b8d4c44c8a82..2f19cfbc57ad 100644
--- a/dts/upstream/src/arm/st/stm32h743.dtsi
+++ b/dts/upstream/src/arm/st/stm32h743.dtsi
@@ -211,6 +211,14 @@
                        };
                };
 
+               uart8: serial@40007c00 {
+                       compatible = "st,stm32h7-uart";
+                       reg = <0x40007c00 0x400>;
+                       interrupts = <83>;
+                       status = "disabled";
+                       clocks = <&rcc UART8_CK>;
+               };
+
                usart1: serial@40011000 {
                        compatible = "st,stm32h7-uart";
                        reg = <0x40011000 0x400>;
-- 
2.43.0

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