mtd: add a new ecc_step_size field to mtd_info{}

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Gitweb:     http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=c41a0582d59e3bc41978ac4a23e457d86ac7365f
Commit:     c41a0582d59e3bc41978ac4a23e457d86ac7365f
Parent:     daae74cad4bcd4566fcb82477e33c42bcdaa86e8
Author:     Huang Shijie <b32955 at freescale.com>
AuthorDate: Fri Aug 16 10:10:04 2013 +0800
Committer:  David Woodhouse <David.Woodhouse at intel.com>
CommitDate: Fri Aug 30 21:37:01 2013 +0100

    mtd: add a new ecc_step_size field to mtd_info{}
    
    In order to implement the NAND boot for some Freescale's chips, such as
    imx23/imx28/imx50/imx6, we use a tool (called kobs-ng) to burn the uboot
    and some metadata to nand chip. And the ROM code will use the metadata to
    configrate the BCH, and to find the uboot.
    
    The ECC information(ecc step size, ecc strength) which is used to configrure
    the BCH is part of the metadata. The kobs-ng can get the ecc strength from
    the sys node /sys/*/ecc_strength now. But it can not get the ecc step size.
    
    This patch adds a new field to store the ecc step size in mtd_info{}, and
    it makes preparation for the next patches.
    
    Signed-off-by: Huang Shijie <b32955 at freescale.com>
    Signed-off-by: Artem Bityutskiy <artem.bityutskiy at linux.intel.com>
    Signed-off-by: Brian Norris <computersforpeace at gmail.com>
    Signed-off-by: David Woodhouse <David.Woodhouse at intel.com>
---
 include/linux/mtd/mtd.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index a5cf4e8..f9bfe52 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -173,6 +173,9 @@ struct mtd_info {
 	/* ECC layout structure pointer - read only! */
 	struct nand_ecclayout *ecclayout;
 
+	/* the ecc step size. */
+	unsigned int ecc_step_size;
+
 	/* max number of correctible bit errors per ecc step */
 	unsigned int ecc_strength;