[PATCH 1/2] arm64: dts: st: add arm-wdt node for watchdog support on stm32mp251

[Alexandre Torgue]

Add the node to use the ARM SMC watchdog support. It will
use a dedicated smc-id to configure and kick the watchdog.

Signed-off-by: Lionel Debieve <lionel.debieve at foss.st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue at foss.st.com>

diff --git a/arch/arm64/boot/dts/st/stm32mp251.dtsi b/arch/arm64/boot/dts/st/stm32mp251.dtsi
index d7cb05d534ac..124403f5f1f4 100644
--- a/arch/arm64/boot/dts/st/stm32mp251.dtsi
+++ b/arch/arm64/boot/dts/st/stm32mp251.dtsi
@@ -28,6 +28,12 @@
 		interrupt-parent = <&intc>;
 	};
 
+	arm_wdt: watchdog {
+		compatible = "arm,smc-wdt";
+		arm,smc-id = <0xb200005a>;
+		status = "disabled";
+	};
+
 	clocks {
 		ck_flexgen_08: ck-flexgen-08 {
 			#clock-cells = <0>;
-- 
2.17.1