diff --git a/subsys/testsuite/busy_sim/busy_sim.c b/subsys/testsuite/busy_sim/busy_sim.c
index 11f94bcc37d..a63b21d13fa 100644
--- a/subsys/testsuite/busy_sim/busy_sim.c
+++ b/subsys/testsuite/busy_sim/busy_sim.c
@@ -21,6 +21,7 @@ struct busy_sim_data {
 	struct k_work work;
 	struct ring_buf rnd_rbuf;
 	uint8_t rnd_buf[BUFFER_SIZE];
+	busy_sim_cb_t cb;
 };
 
 struct busy_sim_config {
@@ -110,6 +111,10 @@ static void counter_alarm_callback(const struct device *dev,
 	}
 
 	/* Busy loop */
+	if (data->cb) {
+		data->cb();
+	}
+
 	k_busy_wait(get_timeout(false) / data->us_tick);
 
 	if (config->pin_spec.port) {
@@ -123,12 +128,13 @@ static void counter_alarm_callback(const struct device *dev,
 }
 
 void busy_sim_start(uint32_t active_avg, uint32_t active_delta,
-		    uint32_t idle_avg, uint32_t idle_delta)
+		    uint32_t idle_avg, uint32_t idle_delta, busy_sim_cb_t cb)
 {
 	int err;
 	const struct busy_sim_config *config = get_dev_config(busy_sim_dev);
 	struct busy_sim_data *data = get_dev_data(busy_sim_dev);
 
+	data->cb = cb;
 	data->active_avg = active_avg;
 	data->active_delta = active_delta;
 	data->idle_avg = idle_avg;
diff --git a/subsys/testsuite/include/busy_sim.h b/subsys/testsuite/include/busy_sim.h
index 3226a2b1712..a2e77b5a2fd 100644
--- a/subsys/testsuite/include/busy_sim.h
+++ b/subsys/testsuite/include/busy_sim.h
@@ -6,6 +6,8 @@
 #ifndef BUSY_SIM_H__
 #define BUSY_SIM_H__
 
+typedef void (*busy_sim_cb_t)(void);
+
 /**
  * @brief Start busy simulator.
  *
@@ -16,12 +18,19 @@
  * values and keep them in a ring buffer.
  *
  * @param active_avg Avarage time of busy looping in the counter callback (in microseconds).
+ *
  * @param active_delta Specifies deviation from avarage time of busy looping (in microseconds).
+ *
  * @param idle_avg Avarage time of counter alarm timeout (in microseconds).
+ *
  * @param idle_delta Specifies deviation from avarage time of counter alarm (in microseconds).
+ *
+ * @param cb Callback called from the context of the busy simulator timeout. If ZLI interrupt
+ * is used for busy simulator counter then kernel API cannot be used from that callback.
+ * Callback is called before busy waiting.
  */
 void busy_sim_start(uint32_t active_avg, uint32_t active_delta,
-			  uint32_t idle_avg, uint32_t idle_delta);
+		    uint32_t idle_avg, uint32_t idle_delta, busy_sim_cb_t cb);
 
 /** @brief Stop busy simulator. */
 void busy_sim_stop(void);
diff --git a/tests/ztest/busy_sim/src/main.c b/tests/ztest/busy_sim/src/main.c
index 2ecbc345982..7a09a4a6076 100644
--- a/tests/ztest/busy_sim/src/main.c
+++ b/tests/ztest/busy_sim/src/main.c
@@ -21,7 +21,7 @@ static void test_busy_sim(void)
 
 	/* Start busy simulator and check that k_busy_wait last longer */
 	t = k_uptime_get_32();
-	busy_sim_start(500, 200, 1000, 400);
+	busy_sim_start(500, 200, 1000, 400, NULL);
 	k_busy_wait(1000 * ms);
 	t = k_uptime_get_32() - t;
 	busy_ms = (3 * ms) / 2;