tests: pm: device: test pm_device_is_powered

Add tests for the function that checks whether a device is currently
powered.

Signed-off-by: Jordan Yates <[email protected]>

Author: Jordan Yates

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

@@ -15,25 +15,41 @@ static void test_demo(void)
 	const struct device *reg_1 = DEVICE_DT_GET(DT_NODELABEL(test_reg_1));
 	const struct device *reg_chained = DEVICE_DT_GET(DT_NODELABEL(test_reg_chained));
 
+	/* Initial power state */
+	zassert_true(pm_device_is_powered(reg_0), "");
+	zassert_true(pm_device_is_powered(reg_1), "");
+	zassert_false(pm_device_is_powered(reg_chained), "");
+
 	TC_PRINT("Enabling runtime power management on regulators\n");
 
 	pm_device_runtime_enable(reg_0);
 	pm_device_runtime_enable(reg_1);
 	pm_device_runtime_enable(reg_chained);
 
+	/* State shouldn't have changed */
+	zassert_true(pm_device_is_powered(reg_0), "");
+	zassert_true(pm_device_is_powered(reg_1), "");
+	zassert_false(pm_device_is_powered(reg_chained), "");
+
 	TC_PRINT("Cycling: %s\n", reg_0->name);
 
+	/* reg_chained is powered off reg_0, so it's power state should change */
 	pm_device_runtime_get(reg_0);
+	zassert_true(pm_device_is_powered(reg_chained), "");
 	pm_device_runtime_put(reg_0);
+	zassert_false(pm_device_is_powered(reg_chained), "");
 
 	TC_PRINT("Cycling: %s\n", reg_1->name);
 
 	pm_device_runtime_get(reg_1);
+	zassert_false(pm_device_is_powered(reg_chained), "");
 	pm_device_runtime_put(reg_1);
 
 	TC_PRINT("Cycling: %s\n", reg_chained->name);
 
+	/* reg_chained should be powered after being requested */
 	pm_device_runtime_get(reg_chained);
+	zassert_true(pm_device_is_powered(reg_chained), "");
 	pm_device_runtime_put(reg_chained);
 
 	TC_PRINT("DONE\n");