[PATCH V4 6/9] mtd: add ECC info for nand_flash_dev{}

[Huang Shijie]

Add an instance of an anonymous struct to store the ECC infor for full id
nand chips.
	@ecc.strength: ECC correctability from the datasheet.
	@ecc.size: ECC size required by the @ecc.strength,

Also add the necessary macros to make the code simple and clean.

Signed-off-by: Huang Shijie <b32955 at freescale.com>
---
 include/linux/mtd/nand.h |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 9b28739..5f1c0d1 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -625,6 +625,11 @@ struct nand_chip {
 	{ .name = (nm), {{ .dev_id = (devid) }}, .chipsize = (chipsz), \
 	  .options = (opts) }
 
+#define NAND_ECC_INFO(_strength, _size)	\
+			{ .strength = (_strength), .size = (_size) }
+#define NAND_ECC_STRENGTH(type)		((type)->ecc.strength)
+#define NAND_ECC_SIZE(type)		((type)->ecc.size)
+
 /**
  * struct nand_flash_dev - NAND Flash Device ID Structure
  * @name: a human-readable name of the NAND chip
@@ -642,6 +647,12 @@ struct nand_chip {
  * @options: stores various chip bit options
  * @id_len: The valid length of the @id.
  * @oobsize: OOB size
+ * @ecc.strength: The ECC correctability from the datasheet, same as the
+ *                @ecc_strength in nand_chip{}.
+ * @ecc.size: The ECC size required by the @ecc.strength, same as the
+ *            @ecc_size in nand_chip{}.
+ *            For example, the "4bit ECC for each 512Byte" can be set with
+ *            NAND_ECC_INFO(4, 512).
  */
 struct nand_flash_dev {
 	char *name;
@@ -658,6 +669,10 @@ struct nand_flash_dev {
 	unsigned int options;
 	uint16_t id_len;
 	uint16_t oobsize;
+	struct {
+		uint16_t strength;
+		uint16_t size;
+	} ecc;
 };
 
 /**
-- 
1.7.1