core: fdtaddr: add devfdt_get_addr_size_index_ptr function

Add devfdt_get_addr_size_index_ptr function with the same
functionality as devfdt_get_addr_size_index, but instead
a return pointer is given.

Suggested-by: Michael Nazzareno Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Michael Trimarchi <michael@amarulasolutions.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/include/dm/fdtaddr.h b/include/dm/fdtaddr.h
index c9d2b27..dcdc191 100644
--- a/include/dm/fdtaddr.h
+++ b/include/dm/fdtaddr.h
@@ -111,7 +111,7 @@
  * @dev: Pointer to a device
  * @index: the 'reg' property can hold a list of <addr, size> pairs
  *	   and @index is used to select which one is required
- * @size: Pointer to size varible - this function returns the size
+ * @size: Pointer to size variable - this function returns the size
  *        specified in the 'reg' property here
  *
  * Return: addr
@@ -120,6 +120,21 @@
 				      fdt_size_t *size);
 
 /**
+ * devfdt_get_addr_size_index_ptr() - Return indexed pointer to the address of the
+ *                                    reg property of a device
+ *
+ * @dev: Pointer to a device
+ * @index: the 'reg' property can hold a list of <addr, size> pairs
+ *	   and @index is used to select which one is required
+ * @size: Pointer to size variable - this function returns the size
+ *        specified in the 'reg' property here
+ *
+ * Return: Pointer to addr, or NULL if there is no such property
+ */
+void *devfdt_get_addr_size_index_ptr(const struct udevice *dev, int index,
+				     fdt_size_t *size);
+
+/**
  * devfdt_get_addr_name() - Get the reg property of a device, indexed by name
  *
  * @dev: Pointer to a device