This commit adds simple helpers to obtain the devicetree properties
that specify the ECC strength and ECC step size to use on a given
NAND controller.
Acked-by: NBoris BREZILLON <b.brezillon.dev@gmail.com>
Signed-off-by: NEzequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

It seems the include guard was copied from of_net.h.
Signed-off-by: NPhilipp Rosenberger <philipp.rosenberger@xse.de>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

Just like the rest of the subsystems, let's add the required no-op
functions to implement stubs when CONFIG_OF=n.

This prevents MTD drivers from having ugly ifdefs in their code,
and instead hide the ifdef monster in the header closet (far away
from people's sight).
Signed-off-by: NEzequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

This patch does the following:
 -const int of_get_nand_ecc_mode(struct device_node *np)
 +int of_get_nand_ecc_mode(struct device_node *np)

because:
1. it is probably just a typo?
2. it causes warnings like this when people assing the returned
   value to an 'int' variable:
   include/linux/of_mtd.h:14:18: warning: type qualifiers ignored on functi=
on return type [-Wignored-qualifiers]

Remove also the unnecessary "extern" qualifier to be consistent with other
declarations in this file.
Signed-off-by: NArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: NRob Herring <rob.herring@calxeda.com>

- nand-ecc-mode : String, operation mode of the NAND ecc mode.
  Supported values are: "none", "soft", "hw", "hw_syndrome", "hw_oob_first",
  "soft_bch".
- nand-bus-width : 8 or 16 bus width if not present 8
- nand-on-flash-bbt: boolean to enable on flash bbt option if not present false
Signed-off-by: NJean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: NGrant Likely <grant.likely@secretlab.ca>
Acked-by: NStefan Roese <sr@denx.de>