Messages in this thread | | | From | <> | Subject | [PATCH 0/7] mtd: spi-nor: move manuf out of the core - batch 1 | Date | Wed, 31 Jul 2019 09:03:25 +0000 |
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From: Tudor Ambarus <tudor.ambarus@microchip.com>
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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