Revert "gpio: remove broken irq_to_gpio() interface"

This reverts commit ee2204a37957daed80418ea8ffc4f5c3146fb8e7.

diff --git a/include/linux/gpio.h b/include/linux/gpio.h
index 6fc1c9e74854a58aa2a48dd80398eafbe11bd9e7..d12b5d566e4b11c725aa79dae8f2301364d3b9a9 100644 (file)
--- a/include/linux/gpio.h
+++ b/include/linux/gpio.h
@@ -70,6 +70,11 @@ static inline int gpio_to_irq(unsigned int gpio)
        return __gpio_to_irq(gpio);
 }
 
+static inline int irq_to_gpio(unsigned int irq)
+{
+       return -EINVAL;
+}
+
 #endif /* ! CONFIG_ARCH_HAVE_CUSTOM_GPIO_H */
 
 /* CONFIG_GPIOLIB: bindings for managed devices that want to request gpios */
@@ -217,6 +222,13 @@ static inline void gpiochip_unlock_as_irq(struct gpio_chip *chip,
        WARN_ON(1);
 }
 
+static inline int irq_to_gpio(unsigned irq)
+{
+       /* irq can never have been returned from gpio_to_irq() */
+       WARN_ON(1);
+       return -EINVAL;
+}
+
 static inline int
 gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
                       unsigned int gpio_offset, unsigned int pin_offset,