diff --git a/arch/avr32/mach-at32ap/include/mach/portmux.h b/arch/avr32/mach-at32ap/include/mach/portmux.h
index b1abe6b4e4efef469f8098dd2d1ebb04873d937d..4bbf99ec2c43475d0d952510059b42a370548039 100644
--- a/arch/avr32/mach-at32ap/include/mach/portmux.h
+++ b/arch/avr32/mach-at32ap/include/mach/portmux.h
@@ -24,6 +24,7 @@
 void at32_select_periph(unsigned int pin, unsigned int periph,
 			unsigned long flags);
 void at32_select_gpio(unsigned int pin, unsigned long flags);
+void at32_deselect_pin(unsigned int pin);
 void at32_reserve_pin(unsigned int pin);
 
 #endif /* __ASM_ARCH_PORTMUX_H__ */
diff --git a/arch/avr32/mach-at32ap/pio.c b/arch/avr32/mach-at32ap/pio.c
index 405ee6bad4ce59dd888448b100daba698cf12b0c..90ef538ae547a47268e9470ff9e950d4f7159c61 100644
--- a/arch/avr32/mach-at32ap/pio.c
+++ b/arch/avr32/mach-at32ap/pio.c
@@ -134,6 +134,25 @@ void __init at32_select_gpio(unsigned int pin, unsigned long flags)
 	dump_stack();
 }
 
+/*
+ * Undo a previous pin reservation. Will not affect the hardware
+ * configuration.
+ */
+void at32_deselect_pin(unsigned int pin)
+{
+	struct pio_device *pio;
+	unsigned int pin_index = pin & 0x1f;
+
+	pio = gpio_to_pio(pin);
+	if (unlikely(!pio)) {
+		printk("pio: invalid pin %u\n", pin);
+		dump_stack();
+		return;
+	}
+
+	clear_bit(pin_index, &pio->pinmux_mask);
+}
+
 /* Reserve a pin, preventing anyone else from changing its configuration. */
 void __init at32_reserve_pin(unsigned int pin)
 {