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mtd: spinand: Add support for 5-byte IDs

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E.g. ESMT chips will return an identification code with a length of 5
bytes. In order to prevent ambiguity, flash chips would actually need to
return IDs that are up to 17 or more bytes long due to JEDEC's
continuation scheme. I understand that if a manufacturer ID is located
in bank N of JEDEC's database (there are currently 16 banks), N - 1
continuation codes (7Fh) need to be added to the identification code
(comprising of manufacturer ID and device ID). However, most flash chip
manufacturers don't seem to implement this (correctly).

Signed-off-by: Ezra Buehler <ezra.buehler@husqvarnagroup.com>
Reviewed-by: Martin Kurbanov <mmkurbanov@salutedevices.com>
Tested-by: Martin Kurbanov <mmkurbanov@salutedevices.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20240125200108.24374-2-ezra@easyb.ch
This commit is contained in:
Ezra Buehler 2024-01-25 22:01:07 +02:00 committed by Miquel Raynal
parent c7f0f920dd
commit 34a956739d
1 changed files with 1 additions and 1 deletions
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2
include/linux/mtd/spinand.h
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@ -169,7 +169,7 @@
struct spinand_op;
struct spinand_device;
#define SPINAND_MAX_ID_LEN 4
#define SPINAND_MAX_ID_LEN 5
/*
* For erase, write and read operation, we got the following timings :
* tBERS (erase) 1ms to 4ms