tests: device_wakeup_api: Use DTS overlay for power state

Define the power state needed in the test in DT.

Signed-off-by: Flavio Ceolin <[email protected]>

tests/subsys/pm/device_wakeup_api/boards/native_posix.overlay

@@ -3,9 +3,24 @@
  *
  * SPDX-License-Identifier: Apache-2.0
  */
+/ {
+	cpus {
+		power-states {
+			state0: state0 {
+				compatible = "zephyr,power-state";
+				power-state-name = "suspend-to-ram";
+				zephyr,pm-device-enabled;
+			};
+		};
+	};
+};
 
 &gpio0 {
 	compatible = "zephyr,gpio-emul";
 	gpio-controller;
 	wakeup-source;
 };
+
+&cpu0 {
+	cpu-power-states = <&state0>;
+};

tests/subsys/pm/device_wakeup_api/src/main.c

@@ -60,16 +60,14 @@ void pm_state_exit_post_ops(enum pm_state state, uint8_t substate_id)
 
 const struct pm_state_info *pm_policy_next_state(uint8_t cpu, int32_t ticks)
 {
-	static const struct pm_state_info state = {
-		.state = PM_STATE_SUSPEND_TO_RAM,
-		.pm_device_enabled = true,
-	};
+	const struct pm_state_info *cpu_states;
 
-	ARG_UNUSED(cpu);
+	zassert_true(pm_state_cpu_get_all(cpu, &cpu_states) == 1,
+		     "There is no power state defined");
 
 	while (sleep_count < 3) {
 		sleep_count++;
-		return &state;
+		return &cpu_states[0];
 	}
 
 	return NULL;