[PATCH 0/4] mtd: spi-nor: Add support for Octal 8D-8D-8D mode
masonccyang at mxic.com.tw
Fri Nov 15 00:58:04 PST 2019
This is repost of patchset from Boris Brezillon's
[RFC,00/18] mtd: spi-nor: Proposal for 8-8-8 mode support .
Background from cover letter for RFC.
The trend has been around Octal NOR Flash lately and the latest mainline
already supports 1-1-8 and 1-8-8 modes.
Boris opened a discussion on how we should support stateful modes (X-X-X
and XD-XD-XD, where X is the bus width and D means Double Transfer Rate).
JESD216C has defined specification for Octal 8-8-8 and 8D-8D-8D.
It defined command and command extension in
JEDEC Basic Flash Parameter Table(18th DWORD) as well as how to
enable 8-8-8/8D-8D-8D mode sequences (Write CFG Reg 2).
The first set of patches is according to JESD216C adding Double Transfer
Rate(DTR) fields, extension command and command bytes number to the
The second set of patches define the relevant macrons and enum in spi-nor
layer for Octal 8-8-8 and 8D-8D-8D mode operation.
The last set of patches in the series are modifying spi_nor_fixups hook to
tweak flash parameters for spi_nor_read/pp_setting() and then in a
chip-specific way to enter 8-8-8 or 8D-8D-8D modes on a Macronix chip.
Also patched spi-mxic driver for testing on Macronix's Zynq PicoZed board
with Macronix's SPI controller (spi-mxic.c) and mx25uw51245g Octal flash.
thnaks for your time and review.
Mason Yang (4):
spi: spi-mem: Add support for Octal 8D-8D-8D mode
mtd: spi-nor: Add support for Octal 8D-8D-8D mode
mtd: spi-nor: Add Octal 8D-8D-8D mode support for Macronix
spi: mxic: Add support for Octal 8D-8D-8D mode
drivers/mtd/spi-nor/spi-nor.c | 273 +++++++++++++++++++++++++++++++++++++++++-
drivers/spi/spi-mem.c | 8 +-
drivers/spi/spi-mxic.c | 98 ++++++++++-----
include/linux/mtd/spi-nor.h | 61 +++++++++-
include/linux/spi/spi-mem.h | 13 ++
5 files changed, 410 insertions(+), 43 deletions(-)
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