diff --git a/drivers/gpio/mxc_gpio.c b/drivers/gpio/mxc_gpio.c
index df6bbbb..7e65b39 100644
--- a/drivers/gpio/mxc_gpio.c
+++ b/drivers/gpio/mxc_gpio.c
@@ -34,6 +34,7 @@
 	MXC_GPIO_DIRECTION_OUT,
 };
 
+#define GPIO_TO_PORT(n)		(n / 32)
 
 /* GPIO port description */
 static unsigned long gpio_ports[] = {