diff --git a/drivers/gpio/gpio.c b/drivers/gpio/gpio.c
index 6ad8d27..042a062 100644
--- a/drivers/gpio/gpio.c
+++ b/drivers/gpio/gpio.c
@@ -4,17 +4,8 @@
 
 static LIST_HEAD(chip_list);
 
-#define ARCH_NR_GPIOS 256
-
 static struct gpio_chip *gpio_desc[ARCH_NR_GPIOS];
 
-static int gpio_is_valid(unsigned gpio)
-{
-	if (gpio < ARCH_NR_GPIOS)
-		return 1;
-	return 0;
-}
-
 void gpio_set_value(unsigned gpio, int value)
 {
 	struct gpio_chip *chip = gpio_desc[gpio];
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index 1997888..c2e7a5d 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -1,6 +1,17 @@
 #ifndef __ASM_GENERIC_GPIO_H
 #define __ASM_GENERIC_GPIO_H
 
+#define ARCH_NR_GPIOS 256
+
+static inline int gpio_is_valid(int gpio)
+{
+	if (gpio < 0)
+		return 0;
+	if (gpio < ARCH_NR_GPIOS)
+		return 1;
+	return 0;
+}
+
 void gpio_set_value(unsigned gpio, int value);
 int gpio_get_value(unsigned gpio);
 int gpio_direction_output(unsigned gpio, int value);