[v4,0/8] New Arasan NAND controller driver

Hello,

This is a deep rework of Naga's Arasan NAND controller driver. This
version is the final version and works with software ECC. It relies on
a previous series called "Supporting restricted NAND controllers" that
brings more flexibility to the NAND with the goal to support
restricted controllers like this one.

Cheers,
Miquèl

Changes in v4:
* Collected Reviewed-by tags.
* Dropped Ivan from the list (did not find his contact).
* Wrapped commit log.
* Fixed typos in the commit logs/comments.
* Took authorship of all patches.
* Added more details on the BCH changes.
* Documented the new bch_control entry.
* Made the swap bit calls conditionals in bch_encode to avoid
  penalizing people that do not use it.
* Patched bch_init() to take an extra argument.
* Dropped calls to nand_release(), use the construction proposed by
  Boris instead.
* Dropped a useless NFC struct field.
* Added a comment on not having an interrupt for RB.
* Checked the number of steps requested is compatible with the
  controller limitations.
* Reworked anfc_exec_op as suggested to treat the check_only argument
  another way.
* Change the comment stating that the controller has only one CS.
* Clarified the interrupts signals vs. interrupt status bits.

Changes in v3:
* Prefix specific clock definitions with XLNX as they do not apply for
  any other SoC and are attached to a single compatible.
* Used field getters/setters as defined in bitfield.h.
* Force casting to u32 before shifting u8 values by 8 16 or 24 bits.
* Comply with the recent core changes and select manually
  nand_monolithic_read/write_page_raw() helpers.
* Add MAINTAINER patch.
* Add a bit extraction helper in the core.
* Rename BCH functions.
* Add a swapping bit mechanism to BCH.
* Support the hardware ECC engine.

Changes in v2:
* Working ->exec_op() implementation relying on core changes.
* Dropped the ECC support for now, will be part of another series if
  this patch is accepted.

Miquel Raynal (8):
  lib/bch: Rework a little bit the exported function names
  lib/bch: Allow easy bit swapping
  mtd: rawnand: Ensure the number of bitflips is consistent
  mtd: rawnand: Add nand_extract_bits()
  MAINTAINERS: Add Arasan NAND controller and bindings
  dt-bindings: mtd: Document ARASAN NAND bindings
  mtd: rawnand: arasan: Add new Arasan NAND controller
  mtd: rawnand: arasan: Support the hardware BCH ECC engine

 .../bindings/mtd/arasan,nand-controller.yaml  |   63 +
 MAINTAINERS                                   |    7 +
 drivers/mtd/devices/docg3.c                   |   10 +-
 drivers/mtd/nand/raw/Kconfig                  |    7 +
 drivers/mtd/nand/raw/Makefile                 |    1 +
 drivers/mtd/nand/raw/arasan-nand-controller.c | 1227 +++++++++++++++++
 drivers/mtd/nand/raw/nand_base.c              |   52 +-
 drivers/mtd/nand/raw/nand_bch.c               |   10 +-
 include/linux/bch.h                           |   11 +-
 include/linux/mtd/rawnand.h                   |    4 +
 lib/bch.c                                     |  152 +-
 11 files changed, 1480 insertions(+), 64 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mtd/arasan,nand-controller.yaml
 create mode 100644 drivers/mtd/nand/raw/arasan-nand-controller.c