diff --git a/include/drivers/st/stm32mp_clkfunc.h b/include/drivers/st/stm32mp_clkfunc.h
index c3329cc..a282035 100644
--- a/include/drivers/st/stm32mp_clkfunc.h
+++ b/include/drivers/st/stm32mp_clkfunc.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2020, STMicroelectronics - All Rights Reserved
+ * Copyright (c) 2017-2021, STMicroelectronics - All Rights Reserved
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -26,5 +26,6 @@
 bool fdt_get_rcc_secure_status(void);
 
 int fdt_get_clock_id(int node);
+unsigned long fdt_get_uart_clock_freq(uintptr_t instance);
 
 #endif /* STM32MP_CLKFUNC_H */