diff --git a/drivers/serial/serial_stm32x7.h b/drivers/serial/serial_stm32x7.h
index facfdba..42b05f1 100644
--- a/drivers/serial/serial_stm32x7.h
+++ b/drivers/serial/serial_stm32x7.h
@@ -22,6 +22,11 @@
 	u32 tx_dr;
 };
 
+/* Information about a serial port */
+struct stm32x7_serial_platdata {
+	struct stm32_usart *base;  /* address of registers in physical memory */
+	unsigned int clock;
+};
 
 #define USART_CR1_OVER8			(1 << 15)
 #define USART_CR1_TE			(1 << 3)