#define NAND_MFR_MACRONIX 0xc2
#define NAND_MFR_EON 0x92
+/*
+ * A helper for defining older NAND chips where the second ID byte fully
+ * defined the chip, including the geometry (chip size, eraseblock size, page
+ * size).
+ */
+#define LEGACY_ID_NAND(nm, devid, pagesz, chipsz, erasesz, opts) \
+ { .name = (nm), .dev_id = (devid), .pagesize = (pagesz), \
+ .chipsize = (chipsz), .erasesize = (erasesz), \
+ .options = (opts) }
+
+/*
+ * A helper for defining newer chips which report their page size and
+ * eraseblock size via the extended ID bytes.
+ *
+ * The real difference between LEGACY_ID_NAND and EXTENDED_ID_NAND is that with
+ * EXTENDED_ID_NAND, manufacturers overloaded the same device ID so that the
+ * device ID now only represented a particular total chip size (and voltage,
+ * buswidth), and the page size, eraseblock size, and OOB size could vary while
+ * using the same device ID.
+ */
+#define EXTENDED_ID_NAND(nm, devid, chipsz, opts) \
+ { .name = (nm), .dev_id = (devid), .chipsize = (chipsz), \
+ .options = (opts) }
+
/**
* struct nand_flash_dev - NAND Flash Device ID Structure
* @name: a human-readable name of the NAND chip