mtd: introduce a macro for max NAND ID sequence length

Introduce a helpful macro for the maximum NAND ID sequence length instead of
using the "8" magic number.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Acked-by: Huang Shijie <shijie8@gmail.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index d5903c0..0f78d19 100644 (file)
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -546,6 +546,9 @@ struct nand_chip {
 #define NAND_MFR_MACRONIX      0xc2
 #define NAND_MFR_EON           0x92
 
+/* The maximum expected count of bytes in the NAND ID sequence */
+#define NAND_MAX_ID_LEN 8
+
 /*
  * A helper for defining older NAND chips where the second ID byte fully
  * defined the chip, including the geometry (chip size, eraseblock size, page
@@ -593,7 +596,7 @@ struct nand_flash_dev {
                        uint8_t mfr_id;
                        uint8_t dev_id;
                };
-               uint8_t id[8];
+               uint8_t id[NAND_MAX_ID_LEN];
        };
        unsigned int pagesize;
        unsigned int chipsize;