[v2,00/20] External ECC engines & Macronix support

Hello all,

This series is now stable and brings support for external/modular ECC
engines, and let SPI controller using the ECC framework.

As a first example, Macronix ECC engine can be used as an
external engine (takes the data, proceeds to the calculations, writes
back the ECC bytes) or as a pipelined engine doing on-the-fly
calculations (which is very common in the raw NAND world).

In the device tree, the ECC engine should be described as a separated DT
node. Then:
* external case: the flash node should provide a nand-ecc-engine
  property pointing to the ECC engine node.
* pipelined case: the flash node should provide a nand-ecc-engine
  property pointing to the SPI controller, itself with another
  nand-ecc-engine property pointing at the ECC engine node.

This series comes with a bunch of improvements on the binding side as
well.

Cheers,
Miquèl

Changes in v2:
* Fixed the bindings and added Rob's acks when relevant.
* Added locking in the ECC engine driver.
* Brought more changes in the core in order to bring the ECC information
  into the spi_mem_op structure with the idea of avoiding any races
  between parallel calls on the same engine.
* Reorganized the ECC driver entirely in order to have a per-engine mxic
  structure plus a per-NAND context. This lead to a number of changes
  internally which cannot all be listed.

Changes since the RFC:
* Rebased on top of v5.15-rc1.
* Fixed the dirmap configuration.
* Added the various tags received.
* Fixed the bindings as reported by the robots.
* Fixed the return value of the helper counting bitflips.
* Included a fix from Jaime Liao in the external pattern logic.
* Added the yaml conversion of Macronix SPI controller description.
* Added the yaml conversion of the SPI-NAND description.
* Created a nand-chip.yaml file to share properties between SPI-NAND and
  raw NAND.

Mason Yang (1):
  mtd: spinand: macronix: Use random program load

Miquel Raynal (19):
  dt-bindings: mtd: nand-controller: Fix the reg property description
  dt-bindings: mtd: nand-controller: Fix a comment in the examples
  dt-bindings: mtd: nand-chip: Create a NAND chip description
  dt-bindings: mtd: spi-nand: Convert spi-nand description file to yaml
  dt-bindings: vendor-prefixes: Clarify Macronix prefix
  dt-bindings: spi: mxic: The interrupt property is not mandatory
  dt-bindings: spi: mxic: Convert to yaml
  dt-bindings: spi: mxic: Document the nand-ecc-engine property
  dt-bindings: mtd: Describe Macronix NAND ECC engine
  mtd: nand: ecc: Add infrastructure to support hardware engines
  mtd: nand: Add a new helper to retrieve the ECC context
  mtd: nand: mxic-ecc: Add Macronix external ECC engine support
  mtd: nand: mxic-ecc: Support SPI pipelined mode
  mtd: spinand: Create direct mapping descriptors for ECC operations
  spi: mxic: Fix the transmit path
  spi: mxic: Create a helper to configure the controller before an
    operation
  spi: mxic: Create a helper to ease the start of an operation
  spi: mxic: Add support for direct mapping
  spi: mxic: Add support for pipelined ECC operations

 .../bindings/mtd/mxicy,nand-ecc-engine.yaml   |  77 ++
 .../devicetree/bindings/mtd/nand-chip.yaml    |  71 ++
 .../bindings/mtd/nand-controller.yaml         |  57 +-
 .../devicetree/bindings/mtd/spi-nand.txt      |   5 -
 .../devicetree/bindings/mtd/spi-nand.yaml     |  27 +
 .../bindings/spi/mxicy,mx25f0a-spi.yaml       |  66 ++
 .../devicetree/bindings/spi/spi-mxic.txt      |  34 -
 .../devicetree/bindings/vendor-prefixes.yaml  |   3 +
 drivers/mtd/nand/Kconfig                      |   6 +
 drivers/mtd/nand/Makefile                     |   1 +
 drivers/mtd/nand/core.c                       |  10 +-
 drivers/mtd/nand/ecc-mxic.c                   | 901 ++++++++++++++++++
 drivers/mtd/nand/ecc.c                        |  88 ++
 drivers/mtd/nand/spi/core.c                   |  28 +-
 drivers/mtd/nand/spi/macronix.c               |   2 +-
 drivers/spi/spi-mxic.c                        | 326 ++++++-
 include/linux/mtd/nand-ecc-mxic.h             |  50 +
 include/linux/mtd/nand.h                      |  33 +
 include/linux/mtd/spinand.h                   |   2 +
 include/linux/spi/spi-mem.h                   |   3 +
 20 files changed, 1642 insertions(+), 148 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mtd/mxicy,nand-ecc-engine.yaml
 create mode 100644 Documentation/devicetree/bindings/mtd/nand-chip.yaml
 delete mode 100644 Documentation/devicetree/bindings/mtd/spi-nand.txt
 create mode 100644 Documentation/devicetree/bindings/mtd/spi-nand.yaml
 create mode 100644 Documentation/devicetree/bindings/spi/mxicy,mx25f0a-spi.yaml
 delete mode 100644 Documentation/devicetree/bindings/spi/spi-mxic.txt
 create mode 100644 drivers/mtd/nand/ecc-mxic.c
 create mode 100644 include/linux/mtd/nand-ecc-mxic.h