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[RFC,00/10] mtd: spi-nor: Update spi-nor framework

Message ID 1512548141-3319-1-git-send-email-prabhakar.kushwaha@nxp.com
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Series mtd: spi-nor: Update spi-nor framework | expand

Message

Prabhakar Kushwaha Dec. 6, 2017, 8:15 a.m. UTC 
SPI-NOR framework currently supports-
 - (1-1-1, 1-1-2, 1-1-4) read protocols
 - read latency(dummy cycles) are hardcoded with the assumption
 that the flash would support it.
 - Number of mode cycles/bits is also hardcoded, but the mode bits
 may be different for different Flashes and they also differ for
 different commands.
 - Additionally the existing framework selects the slowest read protocol
 combination supported by the controller and the Flash.

This patch set add support of 1-2-2, 1-4-4 read protocols. 
It choose the fastest available read protocol. It adds a provision to
configure the read latency (dummy cycles) based on the Flash memory
device. 

This patch also adds support of S25FS-S flash family with required
mode bits(required number of mode cycles). To allow dummy cycle
configuration in flash, new APIs have been added to read/write any register.

Finally it update fsl-quadspi binding to support different modes
(Single, dual, quad) of controller and update its capability
structure. This capability register is used by spi-nor framework
in defining right supported flash configurations.


Prabhakar Kushwaha (10):
  mtd: spi-nor: Add support of 1-2-2, 1-4-4 IO READ protocols
  mtd: spi-nor: Use the highest supported READ protocol
  mtd: spi-nor: Configure read latency for read commands
  mtd: spi-nor: Configure read latency for micron flashes
  Documentation: binding: Update fsl-quadspi binding
  mtd: spi-nor: Update hwcap based on mode of fsl-quadspi
  mtd: spi-nor: Add support of read/write any reg commands
  mtd: spi-nor: Add support of SPANSION S25FS-S flash
  mtd: spi-nor: Disable hybrid mode for SPANSION S25FS-S family
  mtd: spi-nor: Implement anyreg functions for fsl-quadspi

 .../devicetree/bindings/mtd/fsl-quadspi.txt        |   4 +
 drivers/mtd/spi-nor/fsl-quadspi.c                  |  47 ++++-
 drivers/mtd/spi-nor/spi-nor.c                      | 196 +++++++++++++++++++--
 include/linux/mtd/spi-nor.h                        |  19 ++
 4 files changed, 247 insertions(+), 19 deletions(-)