mtd: nand: support ONFI timing mode retrieval for non-ONFI NANDs

Add an onfi_timing_mode_default field to nand_chip and nand_flash_dev in
order to support NAND timings definition for non-ONFI NAND.

NAND that support better timings mode than the default one have to define
a new entry in the nand_ids table.

The default timing mode should be deduced from timings description from
the datasheet and the ONFI specification
(www.onfi.org/~/media/ONFI/specs/onfi_3_1_spec.pdf, chapter 4.15
"Timing Parameters").
You should choose the closest mode that fit the timings requirements of
your NAND chip.

Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 801cad1de9eb..5b5c62712814 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -3594,6 +3594,8 @@ static bool find_full_id_nand(struct mtd_info *mtd, struct nand_chip *chip,
                 chip->options |= type->options;
                 chip->ecc_strength_ds = NAND_ECC_STRENGTH(type);
                 chip->ecc_step_ds = NAND_ECC_STEP(type);
+                chip->onfi_timing_mode_default =
+                                        type->onfi_timing_mode_default;
 
                 *busw = type->options & NAND_BUSWIDTH_16;