NAND_SUBPAGE_READ
chip->options |= NAND_SUBPAGE_READ;
nand->options |= NAND_USES_DMA | NAND_SUBPAGE_READ;
chip->options |= NAND_SUBPAGE_READ;
chip->options |= NAND_SUBPAGE_READ;
chip->options |= NAND_USES_DMA | NAND_SUBPAGE_READ;
chip->options |= NAND_SUBPAGE_READ;
nand->options |= NAND_SUBPAGE_READ;
#define NAND_HAS_SUBPAGE_READ(chip) ((chip->options & NAND_SUBPAGE_READ))