gpio/gpiolib-of: Create of_mm_gpiochip_remove

Create counterpart of of_mm_gpiochip_add(). This way the modules that
can be removable do not duplicate the cleanup code.
Suggested-by: Alexandre Courbot <gnurou@gmail.com>
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpiolib-of.c

@@ -204,6 +204,23 @@ int of_mm_gpiochip_add(struct device_node *np,
 }
 EXPORT_SYMBOL(of_mm_gpiochip_add);
 
+/**
+ * of_mm_gpiochip_remove - Remove memory mapped GPIO chip (bank)
+ * @mm_gc:	pointer to the of_mm_gpio_chip allocated structure
+ */
+void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc)
+{
+	struct gpio_chip *gc = &mm_gc->gc;
+
+	if (!mm_gc)
+		return;
+
+	gpiochip_remove(gc);
+	iounmap(mm_gc->regs);
+	kfree(gc->label);
+}
+EXPORT_SYMBOL(of_mm_gpiochip_remove);
+
 #ifdef CONFIG_PINCTRL
 static void of_gpiochip_add_pin_range(struct gpio_chip *chip)
 {

include/linux/of_gpio.h

@@ -52,6 +52,7 @@ extern int of_get_named_gpio_flags(struct device_node *np,
 
 extern int of_mm_gpiochip_add(struct device_node *np,
 			      struct of_mm_gpio_chip *mm_gc);
+extern void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc);
 
 extern void of_gpiochip_add(struct gpio_chip *gc);
 extern void of_gpiochip_remove(struct gpio_chip *gc);