linux-toradex.git/include/linux/mtd/mtd.h, branch v4.16-rc4

mtd: Add an helper to make erase request aligned on ->erasesize

2018-01-06T14:09:54+00:00

There's currently nothing forcing alignment of einfo->addr and
einfo->len on mtd->erasesize. Since we don't know if automatically
aligning those field in mtd_erase() will hurt some drivers, we add an
helper function to let drivers that need such an alignment explicitly
ask for it.

Signed-off-by: Boris Brezillon 
Reviewed-by: Miquel Raynal

mtd: remove the get_unmapped_area method

2017-11-13T20:39:18+00:00

It is now unused.

Signed-off-by: Nicolas Pitre 
Reviewed-by: Richard Weinberger 
Acked-by: Boris Brezillon 
Tested-by: Chris Brandt 
Signed-off-by: Richard Weinberger

mtd: Fix C++ comment in include/linux/mtd/mtd.h

2017-11-06T22:26:02+00:00

C++ comments look wrong in kernel tree. Fix one.

Signed-off-by: Pavel Machek 
Acked-by: Boris Brezillon 
Signed-off-by: Richard Weinberger

mtd: create per-device and module-scope debugfs entries

2017-07-21T20:25:29+00:00

Several MTD devices are using debugfs entries created in the root.
This commit provides the means for a standardized subtree, creating
one "mtd" entry at root, and one entry per device inside it, named
after the device.
The tree is registered in add_mtd_device, and released in
del_mtd_device.
Devices docg3, mtdswap and nandsim were updated to use this subtree
instead of custom ones, and their entries were prefixed with the
drivers' names.

Signed-off-by: Mario J. Rugiero 
Acked-by: Boris Brezillon 
Signed-off-by: Brian Norris

Merge tag 'for-linus-20170510' of git://git.infradead.org/linux-mtd

2017-05-11T17:44:22+00:00

Pull MTD updates from Brian Norris:
 "NAND, from Boris:
   - some minor fixes/improvements on existing drivers (fsmc, gpio, ifc,
     davinci, brcmnand, omap)
   - a huge cleanup/rework of the denali driver accompanied with core
     fixes/improvements to simplify the driver code
   - a complete rewrite of the atmel driver to support new DT bindings
     make future evolution easier
   - the addition of per-vendor detection/initialization steps to avoid
     extending the nand_ids table with more extended-id entries

  SPI NOR, from Cyrille:
   - fixes in the hisi, intel and Mediatek SPI controller drivers
   - fixes to some SPI flash memories not supporting the Chip Erase
     command.
   - add support to some new memory parts (Winbond, Macronix, Micron,
     ESMT).
   - add new driver for the STM32 QSPI controller

  And a few fixes for Gemini and Versatile platforms on physmap-of"

* tag 'for-linus-20170510' of git://git.infradead.org/linux-mtd: (100 commits)
  MAINTAINERS: Update NAND subsystem git repositories
  mtd: nand: gpio: update binding
  mtd: nand: add ooblayout for old hamming layout
  mtd: oxnas_nand: Allocating more than necessary in probe()
  dt-bindings: mtd: Document the STM32 QSPI bindings
  mtd: mtk-nor: set controller's address width according to nor flash
  mtd: spi-nor: add driver for STM32 quad spi flash controller
  mtd: nand: brcmnand: Check flash #WP pin status before nand erase/program
  mtd: nand: davinci: add comment on NAND subpage write status on keystone
  mtd: nand: omap2: Fix partition creation via cmdline mtdparts
  mtd: nand: NULL terminate a of_device_id table
  mtd: nand: Fix a couple error codes
  mtd: nand: allow drivers to request minimum alignment for passed buffer
  mtd: nand: allocate aligned buffers if NAND_OWN_BUFFERS is unset
  mtd: nand: denali: allow to override revision number
  mtd: nand: denali_dt: use pdev instead of ofdev for platform_device
  mtd: nand: denali_dt: remove dma-mask DT property
  mtd: nand: denali: support 64bit capable DMA engine
  mtd: nand: denali_dt: enable HW_ECC_FIXUP for Altera SOCFPGA variant
  mtd: nand: denali: support HW_ECC_FIXUP capability
  ...

mtd: Convert to dynamically allocated bdi infrastructure

2017-04-20T18:09:55+00:00

MTD already allocates backing_dev_info dynamically. Convert it to use
generic infrastructure for this including proper refcounting. We drop
mtd->backing_dev_info as its only use was to pass mtd_bdi pointer from
one file into another and if we wanted to keep that in a clean way, we'd
have to make mtd hold and drop bdi reference as needed which seems
pointless for passing one global pointer...

CC: David Woodhouse 
CC: Brian Norris 
CC: linux-mtd@lists.infradead.org
Reviewed-by: Christoph Hellwig 
Signed-off-by: Jan Kara 
Signed-off-by: Jens Axboe

mtd: use dev_of_node helper in mtd_get_of_node

2017-04-19T18:38:52+00:00

This allows better compile-time optimizations with CONFIG_OF disabled.

Signed-off-by: Rafał Miłecki 
Acked-by: Boris Brezillon 
Signed-off-by: Brian Norris

mtd: name the mtd device with an optional label property

2017-02-10T18:16:34+00:00

This can be used to easily identify a specific chip on a system with
multiple chips.

Suggested-by: Boris Brezillon 
Signed-off-by: Cédric Le Goater 
Reviewed-by: Marek Vasut 
Signed-off-by: Brian Norris

mtd: introduce function max_bad_blocks

2017-02-08T21:53:52+00:00

If implemented, 'max_bad_blocks' returns the maximum number of bad
blocks to reserve for a MTD. An implementation for NAND is coming soon.

Signed-off-by: Jeff Westfahl 
Signed-off-by: Zach Brown 
Acked-by: Boris Brezillon 
Acked-by: Brian Norris 
Signed-off-by: Brian Norris

mtd: introduce the mtd_pairing_scheme concept

2016-09-15T14:47:56+00:00

MLC and TLC NAND devices are using NAND cells exposing more than one bit,
but instead of attaching all the bits in a given cell to a single NAND
page, each bit is usually attached to a different page. This concept is
called 'page pairing', and has significant impacts on the flash storage
usage.
The main problem showed by these devices is that interrupting a page
program operation may not only corrupt the page we are programming
but also the page it is paired with, hence the need to expose to MTD
users the pairing scheme information.

The pairing APIs allows one to query pairing information attached to a
given page (here called wunit), or the other way around (the wunit
pointed by pairing information).
It also provides several helpers to help the conversion between absolute
offsets and wunits, and query the number of pairing groups.

Signed-off-by: Boris Brezillon 
Reviewed-by: Brian Norris