+/**
+ * blk_next_free_devnum() - get the next device number for an interface type
+ *
+ * Finds the next number that is safe to use for a newly allocated device for
+ * an interface type @if_type.
+ *
+ * @if_type: Interface type to scan
+ * @return next device number safe to use, or -ve on error
+ */
+int blk_next_free_devnum(enum if_type if_type);
+
+/**
+ * blk_select_hwpart() - select a hardware partition
+ *
+ * Select a hardware partition if the device supports it (typically MMC does)
+ *
+ * @dev: Device to update
+ * @hwpart: Partition number to select
+ * @return 0 if OK, -ve on error
+ */
+int blk_select_hwpart(struct udevice *dev, int hwpart);
+
+/**
+ * blk_get_from_parent() - obtain a block device by looking up its parent
+ *
+ * All devices with
+ */
+int blk_get_from_parent(struct udevice *parent, struct udevice **devp);
+
+/**
+ * blk_get_by_device() - Get the block device descriptor for the given device
+ * @dev: Instance of a storage device
+ *
+ * Return: With block device descriptor on success , NULL if there is no such
+ * block device.
+ */
+struct blk_desc *blk_get_by_device(struct udevice *dev);
+