diff --git a/drivers/serial/uart_sam0.c b/drivers/serial/uart_sam0.c
index bae963a658..c4d5d23746 100644
--- a/drivers/serial/uart_sam0.c
+++ b/drivers/serial/uart_sam0.c
@@ -789,14 +789,16 @@ static void uart_sam0_irq_tx_enable(const struct device *dev)
 {
 	SercomUsart * const regs = DEV_CFG(dev)->regs;
 
-	regs->INTENSET.reg = SERCOM_USART_INTENSET_DRE;
+	regs->INTENSET.reg = SERCOM_USART_INTENSET_DRE
+			   | SERCOM_USART_INTENSET_TXC;
 }
 
 static void uart_sam0_irq_tx_disable(const struct device *dev)
 {
 	SercomUsart * const regs = DEV_CFG(dev)->regs;
 
-	regs->INTENCLR.reg = SERCOM_USART_INTENCLR_DRE;
+	regs->INTENCLR.reg = SERCOM_USART_INTENCLR_DRE
+			   | SERCOM_USART_INTENCLR_TXC;
 }
 
 static int uart_sam0_irq_tx_ready(const struct device *dev)
@@ -806,6 +808,13 @@ static int uart_sam0_irq_tx_ready(const struct device *dev)
 	return (regs->INTFLAG.bit.DRE != 0) && (regs->INTENSET.bit.DRE != 0);
 }
 
+static int uart_sam0_irq_tx_complete(const struct device *dev)
+{
+	SercomUsart * const regs = DEV_CFG(dev)->regs;
+
+	return (regs->INTFLAG.bit.TXC != 0) && (regs->INTENSET.bit.TXC != 0);
+}
+
 static void uart_sam0_irq_rx_enable(const struct device *dev)
 {
 	SercomUsart * const regs = DEV_CFG(dev)->regs;
@@ -1141,6 +1150,7 @@ static const struct uart_driver_api uart_sam0_driver_api = {
 	.irq_tx_enable = uart_sam0_irq_tx_enable,
 	.irq_tx_disable = uart_sam0_irq_tx_disable,
 	.irq_tx_ready = uart_sam0_irq_tx_ready,
+	.irq_tx_complete = uart_sam0_irq_tx_complete,
 	.irq_rx_enable = uart_sam0_irq_rx_enable,
 	.irq_rx_disable = uart_sam0_irq_rx_disable,
 	.irq_rx_ready = uart_sam0_irq_rx_ready,