Merge pull request zephyrproject-rtos#20 from AmbiqMicro/ap4-kxr-pm-updates

dts: arm: ambiq: and pm to kxr cpu

Author: RichardSWheatley

boards/ambiq/apollo4p_blue_kxr_evb/apollo4p_blue_kxr_evb.yaml

@@ -14,6 +14,9 @@ supported:
   - gpio
   - spi
   - i2c
+  - rtc
+  - adc
+  - hwinfo
   - clock_control
   - ble
   - usbd

dts/arm/ambiq/ambiq_apollo4p_blue.dtsi

@@ -33,13 +33,35 @@
 		cpu0: cpu@0 {
 			compatible = "arm,cortex-m4f";
 			reg = <0>;
-			#address-cells = <1>;
-			#size-cells = <1>;
 
-			itm: itm@e0000000 {
-				compatible = "arm,armv7m-itm";
-				reg = <0xe0000000 0x1000>;
-				swo-ref-frequency = <DT_FREQ_M(48)>;
+			cpu-power-states = <&idle &suspend_to_ram>;
+		};
+
+		power-states {
+			idle: idle {
+				compatible = "zephyr,power-state";
+				power-state-name = "suspend-to-idle";
+				/*
+				 * As Apollo4 datasheet, run_to_sleep and sleep_to_run
+				 * transition time are both lower than 1us, but
+				 * considering the software overhead we set a
+				 * bigger value.
+				 */
+				min-residency-us = <100>;
+				exit-latency-us = <5>;
+			};
+
+			suspend_to_ram: suspend_to_ram {
+				compatible = "zephyr,power-state";
+				power-state-name = "suspend-to-ram";
+				/*
+				 * As Apollo4 datasheet, run_to_deepsleep transition
+				 * time is lower than 1us and deepsleep_to_run
+				 * transition time is about 25us, but considering
+				 * the software overhead, we set a bigger value.
+				 */
+				min-residency-us = <2000>;
+				exit-latency-us = <125>;
 			};
 		};
 	};