diff --git a/plat/st/stm32mp1/stm32mp1_shared_resources.c b/plat/st/stm32mp1/stm32mp1_shared_resources.c
index a686152..1860681 100644
--- a/plat/st/stm32mp1/stm32mp1_shared_resources.c
+++ b/plat/st/stm32mp1/stm32mp1_shared_resources.c
@@ -4,8 +4,45 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
+#include <assert.h>
+#include <stdint.h>
+
+#include <platform_def.h>
+
+#include <common/debug.h>
+#include <drivers/st/stm32_gpio.h>
+
 #include <stm32mp_shared_resources.h>
 
+/* GPIOZ pin count is saved in RAM to prevent parsing FDT several times */
+static int8_t gpioz_nbpin = -1;
+
+static unsigned int get_gpio_nbpin(unsigned int bank)
+{
+	if (bank != GPIO_BANK_Z) {
+		int count = fdt_get_gpio_bank_pin_count(bank);
+
+		assert((count >= 0) || (count <= (GPIO_PIN_MAX + 1)));
+
+		return (unsigned int)count;
+	}
+
+	if (gpioz_nbpin < 0) {
+		int count = fdt_get_gpio_bank_pin_count(GPIO_BANK_Z);
+
+		assert((count == 0) || (count == STM32MP_GPIOZ_PIN_MAX_COUNT));
+
+		gpioz_nbpin = count;
+	}
+
+	return (unsigned int)gpioz_nbpin;
+}
+
+static unsigned int __unused get_gpioz_nbpin(void)
+{
+	return get_gpio_nbpin(GPIO_BANK_Z);
+}
+
 /* Currently allow full access by non-secure to platform clock services */
 bool stm32mp_nsec_can_access_clock(unsigned long clock_id)
 {