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mtd: nand: allow to set only one of ECC size and ECC strength from DT 

Currently, it is valid to specify both "nand-ecc-step-size" and
"nand-ecc-strength", but not allowed to set only one of them.

This requirement has a conflict with "nand-ecc-maximize"; this flag
is used when you want the driver to choose the best ECC strength.
If "nand-ecc-maximize" is set, "nand-ecc-strength" is very likely to
be unset.

It would be possible to make the if-conditional more complex by
adding the check for the NAND_ECC_MAXIMIZE flag, but I chose to drop
the check entirely.  I thought of the situation where the hardware
has a fixed ECC step size (so it can be hard-coded in the driver),
whereas the ECC strength is configurable by software.  In that case,
we may want to only set "nand-ecc-strength" (or "nand-ecc-maximize")
in DT.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
Masahiro Yamada 2017-03-23 05:07:00 +09:00 committed by Boris Brezillon
parent 33575b25ff
commit 9fe4b66efb
1 changed files with 0 additions and 6 deletions
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6
drivers/mtd/nand/nand_base.c
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@ -4225,12 +4225,6 @@ static int nand_dt_init(struct nand_chip *chip)
ecc_strength = of_get_nand_ecc_strength(dn);
ecc_step = of_get_nand_ecc_step_size(dn);
if ((ecc_step >= 0 && !(ecc_strength >= 0)) ||
(!(ecc_step >= 0) && ecc_strength >= 0)) {
pr_err("must set both strength and step size in DT\n");
return -EINVAL;
}
if (ecc_mode >= 0)
chip->ecc.mode = ecc_mode;