mtd: spi-nor: sfdp: introduce smpt_read_dummy fixup hook

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SMPT contains config detection info that describes opcode, address, and
dummy cycles to read sector map config. The dummy cycles parameter can
be SMPT_CMD_READ_DUMMY_IS_VARIABLE and in that case nor->read_dummy
(initialized as 0) is used. In Infineon flash chips, Read Any Register
command with variable dummy cycle is defined in SMPT. S25Hx/S28Hx flash
has 0 dummy cycle by default to read volatile regiters and
nor->read_dummy can work. S25FS-S flash has 8 dummy cycles so we need a
hook that can fix dummy cycles with actually used value.

Inroduce smpt_read_dummy() in struct spi_nor_fixups. It is called when
the dummy cycle field in SMPT config detection is 'varialble'.

Reviewed-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Tested-by: Marek Vasut <marek.vasut+renesas@mailbox.org> # S25FS512S
Signed-off-by: Takahiro Kuwano <Takahiro.Kuwano@infineon.com>
Signed-off-by: Pratyush Yadav <pratyush@kernel.org>

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Takahiro Kuwano 2025-11-05 16:47:58 +09:00 • committed by Pratyush Yadav

parent 604cf6a401

commit 653f6def56

2 changed files with 19 additions and 2 deletions

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3

drivers/mtd/spi-nor/core.h

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18

drivers/mtd/spi-nor/sfdp.c

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