[PATCH v4 0/3] mtd: spi-nor: Extend SFDP to support additional octal modes as per latest JEDEC standard

Nathan Barrett-Morrison nathan.morrison at timesys.com
Fri Dec 2 05:55:36 PST 2022

In the latest JEDEC standard (JESD216F), there are now bitfields in the
4 byte address instruction table for 1S-1S-8S and 1S-8S-8S modes.

This patchset adds support for checking the 4BAIT for these modes.

v2: Move page program commands into sfdp.c instead of core.c,
as this appears to conform more closely with spi-nor paradigm.
Page program buswidth appears to be automatically determined, so let's
follow suit and do the same.

 - Added missing SPI_NOR_OCTAL_READ_1_8_8 to spi_nor_sfdp check in
 - Convert IS25LX256 to 1S-8S-8S instead of 1S-1S-8S
 - Tested and confirmed both 1S-1S-8S and 1S-8S-8S work on IS25LX256

 - Remove SPI_NOR_OCTAL_READ_1_8_8, this was following a defunct path
 - Correct the IS25LX256's missing BFPT info via a fixup instead

Nathan Barrett-Morrison (3):
  mtd: spi-nor: Extend SFDP 4byte address instruction lookup table with
    new octal modes as per JEDEC JESD216F
  mtd: spi-nor: Add additional octal-mode page program flags to be
    checked during SFDP 4BAIT parsing
  mtd: spi-nor: Add support for IS25LX256 operating in 1S-8S-8S octal
    read mode

 drivers/mtd/spi-nor/issi.c | 32 ++++++++++++++++++++++++++++++++
 drivers/mtd/spi-nor/sfdp.c | 13 +++++++++++++
 2 files changed, 45 insertions(+)


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