diff --git a/drivers/serial/Kconfig.ns16550 b/drivers/serial/Kconfig.ns16550
index 64114235431..4c6676cdab6 100644
--- a/drivers/serial/Kconfig.ns16550
+++ b/drivers/serial/Kconfig.ns16550
@@ -103,17 +103,6 @@ config UART_NS16550_WA_ISR_REENABLE_INTERRUPT
 	  the IER is being toggled to re-assert interrupts at the end of ISR
 	  to nudge the host interrupt controller to fire the ISR again.
 
-config UART_NS16550_WA_TX_FIFO_EMPTY_INTERRUPT
-	bool "Callback directly when the TX FIFO is already empty"
-	default y if SHELL_BACKEND_SERIAL
-	depends on UART_INTERRUPT_DRIVEN
-	help
-	  When calling uart_ns16550_irq_tx_enable() to wait for the TX FIFO
-	  ready interrupt, but this interrupt will only be triggered if the
-	  current state is not empty. Therefore, if the current state is
-	  empty, you need to solve this problem by calling the callback
-	  function directly.
-
 endmenu
 
 endif # UART_NS16550
diff --git a/drivers/serial/uart_ns16550.c b/drivers/serial/uart_ns16550.c
index 0885bd983dd..8b1381e59d8 100644
--- a/drivers/serial/uart_ns16550.c
+++ b/drivers/serial/uart_ns16550.c
@@ -369,10 +369,6 @@ struct uart_ns16550_dev_data {
 	void *cb_data;	/**< Callback function arg */
 #endif
 
-#ifdef CONFIG_UART_NS16550_WA_TX_FIFO_EMPTY_INTERRUPT
-	uint8_t sw_tx_irq; /**< software tx ready flag */
-#endif
-
 #if UART_NS16550_DLF_ENABLED
 	uint8_t dlf;		/**< DLF value */
 #endif
@@ -937,10 +933,6 @@ static void uart_ns16550_poll_out(const struct device *dev,
 
 	ns16550_outbyte(dev_cfg, THR(dev), c);
 
-#ifdef CONFIG_UART_NS16550_WA_TX_FIFO_EMPTY_INTERRUPT
-	data->sw_tx_irq = 0; /**< clean up */
-#endif
-
 	k_spin_unlock(&data->lock, key);
 }
 
@@ -988,12 +980,6 @@ static int uart_ns16550_fifo_fill(const struct device *dev,
 		ns16550_outbyte(dev_cfg, THR(dev), tx_data[i]);
 	}
 
-#ifdef CONFIG_UART_NS16550_WA_TX_FIFO_EMPTY_INTERRUPT
-	if (i != 0) {
-		data->sw_tx_irq = 0; /**< clean up */
-	}
-#endif
-
 	k_spin_unlock(&data->lock, key);
 
 	return i;
@@ -1056,26 +1042,6 @@ static void uart_ns16550_irq_tx_enable(const struct device *dev)
 #endif
 	ns16550_outbyte(dev_cfg, IER(dev), ns16550_inbyte(dev_cfg, IER(dev)) | IER_TBE);
 
-#ifdef CONFIG_UART_NS16550_WA_TX_FIFO_EMPTY_INTERRUPT
-	if (ns16550_inbyte(dev_cfg, LSR(dev)) & LSR_THRE) {
-		k_spin_unlock(&data->lock, key);
-		/*
-		 * The TX FIFO ready interrupt will be triggered if only if
-		 * when the pre-state is not empty. Thus, if the pre-state is
-		 * already empty, try to call the callback routine directly
-		 * to resolve it.
-		 */
-		int irq_lock_key = arch_irq_lock();
-
-		if (data->cb && (ns16550_inbyte(dev_cfg, LSR(dev)) & LSR_THRE)) {
-			data->sw_tx_irq = 1; /**< set tx ready */
-			data->cb(dev, data->cb_data);
-		}
-		arch_irq_unlock(irq_lock_key);
-		return;
-	}
-#endif
-
 	k_spin_unlock(&data->lock, key);
 }
 
@@ -1090,10 +1056,6 @@ static void uart_ns16550_irq_tx_disable(const struct device *dev)
 	const struct uart_ns16550_dev_config * const dev_cfg = dev->config;
 	k_spinlock_key_t key = k_spin_lock(&data->lock);
 
-#ifdef CONFIG_UART_NS16550_WA_TX_FIFO_EMPTY_INTERRUPT
-	data->sw_tx_irq = 0; /**< clean up */
-#endif
-
 	ns16550_outbyte(dev_cfg, IER(dev),
 			ns16550_inbyte(dev_cfg, IER(dev)) & (~IER_TBE));
 
@@ -1134,17 +1096,6 @@ static int uart_ns16550_irq_tx_ready(const struct device *dev)
 
 	int ret = ((IIRC(dev) & IIR_ID) == IIR_THRE) ? 1 : 0;
 
-#ifdef CONFIG_UART_NS16550_WA_TX_FIFO_EMPTY_INTERRUPT
-	if (ret == 0 && data->sw_tx_irq) {
-		/**< replace resoult when there is a software solution */
-		const struct uart_ns16550_dev_config * const dev_cfg = dev->config;
-
-		if (ns16550_inbyte(dev_cfg, IER(dev)) & IER_TBE) {
-			ret = 1;
-		}
-	}
-#endif
-
 	k_spin_unlock(&data->lock, key);
 
 	return ret;