Yaffs file systems can be stored on various types of MTD devices and also in regular files. Each of these storage types needs to be driven slightly differently, but setting all of them up boils down to preparing the same structure defined by Yaffs code (struct yaffs_dev). Add an abstraction layer shared by all Yaffs storage types that serves as a focal point for lower-level layers and prepares a storage-type-specific struct yaffs_dev for use by higher-level layers.
Yaffs file systems can be stored on various types of MTD devices and also in regular files. Each of these storage types needs to be driven slightly differently, but setting all of them up boils down to preparing the same structure defined by Yaffs code (struct yaffs_dev). Add an abstraction layer shared by all Yaffs storage types that serves as a focal point for lower-level layers and prepares a storage-type-specific struct yaffs_dev for use by higher-level layers.