diff --git a/plat/st/common/include/stm32mp_dt.h b/plat/st/common/include/stm32mp_dt.h
index e79551a..44ad820 100644
--- a/plat/st/common/include/stm32mp_dt.h
+++ b/plat/st/common/include/stm32mp_dt.h
@@ -1,4 +1,5 @@
 /*
+ * Copyright (c) 2020, STMicroelectronics - All Rights Reserved
  * Copyright (c) 2017-2019, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
@@ -39,5 +40,6 @@
 uint32_t dt_get_pwr_vdd_voltage(void);
 uintptr_t dt_get_syscfg_base(void);
 const char *dt_get_board_model(void);
+int fdt_get_gpio_bank_pin_count(unsigned int bank);
 
 #endif /* STM32MP_DT_H */