gpio: of: provide optional of_mm_gpiochip_add_data() function

In the same spirit as we add an optional void *data argument
to the gpiochip_add_data() call, we need this also for
of_mm_gpiochip_add().
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpiolib-of.c

@@ -262,9 +262,10 @@ int of_gpio_simple_xlate(struct gpio_chip *gc,
 EXPORT_SYMBOL(of_gpio_simple_xlate);
 
 /**
- * of_mm_gpiochip_add - Add memory mapped GPIO chip (bank)
+ * of_mm_gpiochip_add_data - Add memory mapped GPIO chip (bank)
  * @np:		device node of the GPIO chip
  * @mm_gc:	pointer to the of_mm_gpio_chip allocated structure
+ * @data:	driver data to store in the struct gpio_chip
  *
  * To use this function you should allocate and fill mm_gc with:
  *
@@ -280,8 +281,9 @@ EXPORT_SYMBOL(of_gpio_simple_xlate);
  * do all necessary work for you. Then you'll able to use .regs
  * to manage GPIOs from the callbacks.
  */
-int of_mm_gpiochip_add(struct device_node *np,
-		       struct of_mm_gpio_chip *mm_gc)
+int of_mm_gpiochip_add_data(struct device_node *np,
+			    struct of_mm_gpio_chip *mm_gc,
+			    void *data)
 {
 	int ret = -ENOMEM;
 	struct gpio_chip *gc = &mm_gc->gc;
@@ -301,7 +303,7 @@ int of_mm_gpiochip_add(struct device_node *np,
 
 	mm_gc->gc.of_node = np;
 
-	ret = gpiochip_add(gc);
+	ret = gpiochip_add_data(gc, data);
 	if (ret)
 		goto err2;
 
@@ -315,7 +317,7 @@ int of_mm_gpiochip_add(struct device_node *np,
 	       np->full_name, ret);
 	return ret;
 }
-EXPORT_SYMBOL(of_mm_gpiochip_add);
+EXPORT_SYMBOL(of_mm_gpiochip_add_data);
 
 /**
  * of_mm_gpiochip_remove - Remove memory mapped GPIO chip (bank)

include/linux/of_gpio.h

@@ -51,8 +51,14 @@ static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc)
 extern int of_get_named_gpio_flags(struct device_node *np,
 		const char *list_name, int index, enum of_gpio_flags *flags);
 
-extern int of_mm_gpiochip_add(struct device_node *np,
-			      struct of_mm_gpio_chip *mm_gc);
+extern int of_mm_gpiochip_add_data(struct device_node *np,
+				   struct of_mm_gpio_chip *mm_gc,
+				   void *data);
+static inline int of_mm_gpiochip_add(struct device_node *np,
+				     struct of_mm_gpio_chip *mm_gc)
+{
+	return of_mm_gpiochip_add_data(np, mm_gc, NULL);
+}
 extern void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc);
 
 extern int of_gpiochip_add(struct gpio_chip *gc);