Bluetooth: Controller: Deinit ticker

ticker_is_initialized() should only return true when the ticker is
running (triggered regularly). Users like nrf_flash_sync_is_required()
depend on this behavior.

When the bluetooth controller driver is closed, ll_deinit() calls
lll_deinit(), which stops the ticker from being triggered. Also
deinitialize the ticker to ensure that ticker_is_initialized() returns
false.

Signed-off-by: Marco Widmer <marco.widmer@bytesatwork.ch>

subsys/bluetooth/controller/ll_sw/ull.c

@@ -783,8 +783,18 @@ int ll_init(struct k_sem *sem_rx)
 
 int ll_deinit(void)
 {
+	int err;
+
 	ll_reset();
-	return lll_deinit();
+
+	err = lll_deinit();
+	if (err) {
+		return err;
+	}
+
+	err = ticker_deinit(TICKER_INSTANCE_ID_CTLR);
+
+	return err;
 }
 
 void ll_reset(void)

subsys/bluetooth/controller/ticker/ticker.c

@@ -3475,6 +3475,30 @@ uint8_t ticker_init(uint8_t instance_index, uint8_t count_node, void *node,
 	return TICKER_STATUS_SUCCESS;
 }
 
+/**
+ * @brief Deinitialize ticker instance
+ *
+ * @param instance_index Index of ticker instance
+ */
+int ticker_deinit(uint8_t instance_index)
+{
+	struct ticker_instance *instance;
+
+	if (instance_index >= TICKER_INSTANCE_MAX) {
+		return -EINVAL;
+	}
+
+	instance = &_instance[instance_index];
+
+	if (instance->ticker_id_head != TICKER_NULL) {
+		return -EBUSY;
+	}
+
+	instance->count_node = 0U;
+
+	return 0;
+}
+
 /**
  * @brief Check if ticker instance is initialized
  *

subsys/bluetooth/controller/ticker/ticker.h

@@ -173,6 +173,7 @@ uint8_t ticker_init(uint8_t instance_index, uint8_t count_node, void *node,
 		     void *user_op, ticker_caller_id_get_cb_t caller_id_get_cb,
 		     ticker_sched_cb_t sched_cb,
 		     ticker_trigger_set_cb_t trigger_set_cb);
+int ticker_deinit(uint8_t instance_index);
 bool ticker_is_initialized(uint8_t instance_index);
 void ticker_trigger(uint8_t instance_index);
 void ticker_worker(void *param);