From: Ezra Buehler Date: Thu, 25 Jan 2024 20:01:07 +0000 (+0200) Subject: mtd: spinand: Add support for 5-byte IDs X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=34a956739d295de6010cdaafeed698ccbba87ea4;p=linux.git mtd: spinand: Add support for 5-byte IDs 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 Reviewed-by: Martin Kurbanov Tested-by: Martin Kurbanov Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20240125200108.24374-2-ezra@easyb.ch --- diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h index badb4c1ac079e..5c19ead604996 100644 --- a/include/linux/mtd/spinand.h +++ b/include/linux/mtd/spinand.h @@ -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