Messages in this thread | | | From | Mason Yang <> | Subject | [PATCH 0/4] mtd: spi-nor: Add support for Octal 8D-8D-8D mode | Date | Fri, 15 Nov 2019 16:58:04 +0800 |
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Hello,
This is repost of patchset from Boris Brezillon's [RFC,00/18] mtd: spi-nor: Proposal for 8-8-8 mode support [1].
Background from cover letter for RFC[1].
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 spi_mem_op struct.
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.
[1] https://patchwork.ozlabs.org/cover/982926/
thnaks for your time and review. best regards, Mason
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 mx25uw51245g 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(-)
-- 1.9.1
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