dts: arm: adi: Update MAX32657 low power states and residencies

Set MAX32657 cpu power states as idle, standby and powerdown. Power down
mode is disabled by default and can only be entered by calling
pm_state_force. Note that residency durations may need to be updated
depending on the resolution of chosen sleep timer.

Signed-off-by: Tahsin Mutlugun <[email protected]>

Author: ttmut

dts/arm/adi/max32/max32657_common.dtsi

@@ -19,13 +19,13 @@
 		#address-cells = <1>;
 		#size-cells = <0>;
 
-		cpu@0 {
+		cpu0: cpu@0 {
 			compatible = "arm,cortex-m33";
 			reg = <0>;
 			#address-cells = <1>;
 			#size-cells = <1>;
 
-			cpu-power-states = <&idle &suspend &standby>;
+			cpu-power-states = <&idle &standby &powerdown>;
 
 			mpu: mpu@e000ed90 {
 				compatible = "arm,armv8m-mpu";
@@ -38,28 +38,23 @@
 			idle: idle {
 				compatible = "zephyr,power-state";
 				power-state-name = "runtime-idle";
-				/* The value not mentioned in UG/DS, set it as 1us */
-				min-residency-us = <1>;
-				/* Typical value is 0.847us as per of Datasheet */
-				exit-latency-us = <1>;
-			};
-			/* Deep-sleep Mode */
-			suspend: suspend {
-				compatible = "zephyr,power-state";
-				power-state-name = "suspend-to-idle";
-				/* The value not mentioned in UG/DS, set it as 35us */
-				min-residency-us = <35>;
-				/* Typical value is 12.4us as per of Datasheet */
-				exit-latency-us = <25>;
+				min-residency-us = <50>;
+				exit-latency-us = <5>;
 			};
 			/* Standby Mode */
 			standby: standby {
 				compatible = "zephyr,power-state";
 				power-state-name = "standby";
-				/* The value not mentioned in UG/DS, set it as 40us */
-				min-residency-us = <40>;
-				/* Typical value is 14.7us as per of Datasheet */
-				exit-latency-us = <30>;
+				min-residency-us = <1000>;
+				exit-latency-us = <20>;
+			};
+			/* Powerdown Mode */
+			powerdown: powerdown {
+				compatible = "zephyr,power-state";
+				power-state-name = "soft-off";
+				min-residency-us = <2147483647>;
+				exit-latency-us = <0>;
+				status = "disabled";
 			};
 		};
 	};