The ecc.strength of this IP is a platform-dependent parameter.

I chose {15, 8} as the default to respect the historical reason of
this driver, but it should be overridable to use this driver for
other SoCs.

If necessary, SoCs can provide their own ecc_strength_avail.
This must be an array of supported ecc.strength in descending order,
terminated by zero.

Signed-off-by: Masahiro Yamada <yamada.masah...@socionext.com>
---

 drivers/mtd/nand/denali.c    | 5 ++++-
 drivers/mtd/nand/denali.h    | 1 +
 drivers/mtd/nand/denali_dt.c | 5 ++++-
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
index f2ed3f8..54c9e0c 100644
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c
@@ -1373,7 +1373,7 @@ static int denali_set_max_ecc_strength(struct 
denali_nand_info *denali)
        int oobsize = mtd->oobsize;
        int ecc_size = chip->ecc.size;
        int ecc_steps = mtd->writesize / chip->ecc.size;
-       const int *ecc_strength = denali_default_ecc_strength;
+       const int *ecc_strength = denali->ecc_strength_avail;
        int ecc_bytes;
 
        /* carve out the BBM area */
@@ -1625,6 +1625,9 @@ int denali_init(struct denali_nand_info *denali)
                chip->ecc.size = denali->caps & DENALI_CAPS_ECC_SIZE_1024 ?
                                                                1024 : 512;
 
+       if (!denali->ecc_strength_avail)
+               denali->ecc_strength_avail = denali_default_ecc_strength;
+
        ret = denali_set_max_ecc_strength(denali);
        if (ret)
                goto failed_req_irq;
diff --git a/drivers/mtd/nand/denali.h b/drivers/mtd/nand/denali.h
index 5209625..2892e46 100644
--- a/drivers/mtd/nand/denali.h
+++ b/drivers/mtd/nand/denali.h
@@ -428,6 +428,7 @@ struct denali_nand_info {
        u32 devnum;     /* represent how many nands connected */
        u32 bbtskipbytes;
        u32 max_banks;
+       const int *ecc_strength_avail;
        unsigned int caps;
 #define DENALI_CAPS_HW_ECC_FIXUP               BIT(0)
 #define DENALI_CAPS_DMA_64BIT                  BIT(1)
diff --git a/drivers/mtd/nand/denali_dt.c b/drivers/mtd/nand/denali_dt.c
index f085626..aa1e032 100644
--- a/drivers/mtd/nand/denali_dt.c
+++ b/drivers/mtd/nand/denali_dt.c
@@ -30,6 +30,7 @@ struct denali_dt {
 };
 
 struct denali_dt_data {
+       const int *ecc_strength_avail;
        unsigned int caps;
 };
 
@@ -54,8 +55,10 @@ static int denali_dt_probe(struct platform_device *pdev)
        denali = &dt->denali;
 
        data = of_device_get_match_data(&pdev->dev);
-       if (data)
+       if (data) {
+               denali->ecc_strength_avail = data->ecc_strength_avail;
                denali->caps = data->caps;
+       }
 
        denali->caps |= DENALI_CAPS_HW_ECC_FIXUP;
 
-- 
2.7.4

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