[PATCH 0/7] mtd: spi-nor: move manuf out of the core - batch 1

[<Tudor.Ambarus@xxxxxxxxxxxxx>]

From: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>

The scope of the "mtd: spi-nor: move manuf out of the core" batches,
is to move all manufacturer specific code out of the spi-nor core.

In the quest of removing the manufacturer specific code from the spi-nor
core, we want to impose a timeline/priority on how the flash parameters
are updated. As of now. the flash parameters initialization logic is as
following:

    a/ default flash parameters init in spi_nor_init_params()
    b/ manufacturer specific flash parameters updates, split across entire
       spi-nor core code
    c/ flash parameters updates based on SFDP tables
    d/ post BFPT flash parameter updates

With the "mtd: spi-nor: move manuf out of the core" batches, we want to
impose the following sequence of calls:

    1/ spi-nor core legacy flash parameters init:
            spi_nor_default_init_params()

    2/ MFR-based manufacturer flash parameters init:
            nor->manufacturer->fixups->default_init()

    3/ specific flash_info tweeks done when decisions can not be done just on
       MFR:
            nor->info->fixups->default_init()

    4/ SFDP tables flash parameters init - SFDP knows better:
            spi_nor_sfdp_init_params()

    5/ post SFDP tables flash parameters updates - in case manufacturers get
       the serial flash tables wrong or incomplete.
            nor->info->fixups->post_sfdp()
       The later can be extended to nor->manufacturer->fixups->post_sfdp() if
       needed.

Setting of flash paramters will no longer be spread interleaved accross
the spi-nor core, there will be a clear separation on who and when will update
the flash parameters.

Tested on sst26vf064b with atmel-quadspi SPIMEM driver.

These batches are based of Boris Brezillon's work at:
https://patchwork.ozlabs.org/project/linux-mtd/list/?series=80353

These batches depend on m25p80 code move and a recent fix:
https://patchwork.ozlabs.org/project/linux-mtd/list/?series=120475
https://patchwork.ozlabs.org/project/linux-mtd/list/?series=122416

You can find my developing branch (not stable) at:
https://github.com/ambarus/linux-0day/tree/spi-nor/manuf-drv

Boris Brezillon (3):
  mtd: spi-nor: Add a default_init() fixup hook for gd25q256
  mtd: spi-nor: Create a ->set_4byte() method
  mtd: spi-nor: Rework the SPI NOR lock/unlock logic

Tudor Ambarus (4):
  mtd: spi-nor: Add default_init() hook to tweak flash parameters
  mtd: spi_nor: Rework quad_enable()
  mtd: spi-nor: Split spi_nor_init_params()
  mtd: spi-nor: Rework the disabling of write protection at init

 drivers/mtd/spi-nor/spi-nor.c | 417 ++++++++++++++++++++++++------------------
 include/linux/mtd/spi-nor.h   |  23 ++-
 2 files changed, 260 insertions(+), 180 deletions(-)

-- 
2.9.5


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