diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index 2c5744b..04cb1d1 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -40,6 +40,8 @@
  *	returns either the value actually sensed, or zero
  * @direction_output: configures signal "offset" as output, or returns error
  * @set: assigns output value for signal "offset"
+ * @to_irq: optional hook supporting non-static gpio_to_irq() mappings;
+ *	implementation may not sleep
  * @dbg_show: optional routine to show contents in debugfs; default code
  *	will be used when this is omitted, but custom code can show extra
  *	state (such as pullup/pulldown configuration).
@@ -73,6 +75,10 @@
 						unsigned offset, int value);
 	void			(*set)(struct gpio_chip *chip,
 						unsigned offset, int value);
+
+	int			(*to_irq)(struct gpio_chip *chip,
+						unsigned offset);
+
 	void			(*dbg_show)(struct seq_file *s,
 						struct gpio_chip *chip);
 	int			base;
@@ -112,6 +118,7 @@
 
 extern int __gpio_cansleep(unsigned gpio);
 
+extern int __gpio_to_irq(unsigned gpio);
 
 #ifdef CONFIG_GPIO_SYSFS