1.) Why add a new framework for SPI NOR?
The SPI-NOR controller such as Freescale's Quadspi controller is working
in a different way from the SPI bus. It should knows the NOR commands to
find the right LUT sequence. Unfortunately, the current code can not meet
this requirement.
2.) How does this patch set do?
This patch set adds a new spi-nor layer.
Before this patch, the layer is like:
MTD
------------------------
m25p80
------------------------
spi bus driver
------------------------
SPI NOR chip
After this patch, the layer is like:
MTD
------------------------
spi-nor
------------------------
m25p80
------------------------
spi bus driver
------------------------
SPI NOR chip
With the spi-nor controller driver(Freescale Quadspi), it looks like:
MTD
------------------------
spi-nor
------------------------
fsl-quadspi
------------------------
SPI NOR chip
3.) more details
This patch set adds a new data structrue spi_nor{}, clones most the common
code to spi-nor.c. Add spi_nor_xfer_cfg {} for the fundamental primitives:
read_xfer/write_xfer.
Make the m25p80.c/fsl_quaspi.c use the new APIs.
4.) Change log:
v2 --> v3:
[1] add prepare/unprepare hooks for spi_nor{}.
[2] add a new "priv" field for spi_nor{}.
[3] add the Freescale Quadspi driver which supports the Quad read by
default.
v1 --> v2:
[1] follow Angus's advice, add more hooks and data structrures.
[2] others.
Huang Shijie (7):
mtd: spi-nor: copy the SPI NOR commands to a new header file
mtd: spi-nor: add the basic data structures
mtd: spi-nor: add the framework for SPI NOR
mtd: m25p80: use the SPI nor framework
mtd: spi-nor: add a helper to find the spi_device_id
Documentation: add the binding file for Quadspi driver
mtd: spi-nor: Add Freescale QuadSpi driver
.../devicetree/bindings/mtd/fsl-quadspi.txt | 31 +
drivers/mtd/Kconfig | 2 +
drivers/mtd/Makefile | 1 +
drivers/mtd/devices/Kconfig | 2 +-
drivers/mtd/devices/m25p80.c | 1271 ++------------------
drivers/mtd/spi-nor/Kconfig | 12 +
drivers/mtd/spi-nor/Makefile | 2 +
drivers/mtd/spi-nor/fsl-quadspi.c | 927 ++++++++++++++
drivers/mtd/spi-nor/spi-nor.c | 1098 +++++++++++++++++
include/linux/mtd/spi-nor.h | 167 +++
10 files changed, 2335 insertions(+), 1178 deletions(-)
create mode 100644 Documentation/devicetree/bindings/mtd/fsl-quadspi.txt
create mode 100644 drivers/mtd/spi-nor/Kconfig
create mode 100644 drivers/mtd/spi-nor/Makefile
create mode 100644 drivers/mtd/spi-nor/fsl-quadspi.c
create mode 100644 drivers/mtd/spi-nor/spi-nor.c
create mode 100644 include/linux/mtd/spi-nor.h
--
1.7.2.rc3
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