[PATCH v9 0/3] mtd: spi-nand: Add support for randomizer feature

[Cheng Ming Lin]

From: Cheng Ming Lin <chengminglin at mxic.com.tw>

This patch series introduces randomizer support for SPI NAND devices.

- Patch 1: add the nand-randomizer property to the generic nand-chip.yaml
           bindings. Instead of using boolean properties, it introduces a
           uint32 enum (0 or 1). If the property is omitted, the driver
           will not interfere and will leave the randomizer in its current
           state.
- Patch 2: add the initialization logic and the set_randomizer callback
           to the core framework. The core will now parse the device tree
           properties and enable or disable the randomizer accordingly
           during spinand_init.
- Patch 3: implement the set_randomizer callback specifically for Macronix
           chips (MX35LF/UF series) to handle the vendor-specific register
           operations.

v9:
* Replaced 'nand-enable-randomizer'/'nand-disable-randomizer'
  boolean properties with a single 'nand-randomizer' uint32 enum.
* Switched to use of_property_read_u32() to align with the new
  binding.

v8:
* dt-bindings: spi-nand: macronix: Remove the chip-specific Application
  Note link from the commit message to keep the binding generic.
* mtd: spi-nand: macronix: Update the broken Application Note link and
  move it here from the dt-binding patch per Miquel's suggestion.

v7:
* Directly return the result in macronix_set_randomizer()

v6:
* Added mutual-exclusive constraints using not with required for
  nand-randomizer-enable and nand-randomizer-disable properties based
  on Krzysztof's feedback.
* Simplified the return path in macronix_set_randomizer() to directly
  return ret; and dropped unrelated formatting changes.

v5:
* Promoted the randomizer configuration to use generic NAND properties
  (nand-randomizer-enable and nand-randomizer-disable) instead of
  vendor-specific bindings.
* Refactored the initialization architecture in core.c. The core framework
  is now responsible for parsing the device tree properties and deciding
  whether to enable or disable the randomizer.

v4:
* Fix a build error in spinand_randomizer_init() where a value was
  returned from a void function. (Reported by kernel test robot)
* Update the return type to int.

v3:
* Revert the device tree property to the vendor-specific
  "mxic,randomizer-enable" to strictly follow vendor-specific bindings.

* Update the 'set_randomizer' callback signature to accept a boolean
  'enable' argument, allowing the feature to be explicitly enabled or
  disabled.

* Switch the implementation to use the standard SET_FEATURE command
  to modify the Configuration Register (0x10), replacing the previous
  special program command method.

v2:
* Create a global NAND DT property

Cheng Ming Lin (3):
  dt-bindings: mtd: nand: Add nand-randomizer property
  mtd: spi-nand: Add support for randomizer
  mtd: spi-nand: macronix: Enable randomizer support

 .../devicetree/bindings/mtd/nand-chip.yaml    |  9 +++++
 drivers/mtd/nand/spi/core.c                   | 20 ++++++++++
 drivers/mtd/nand/spi/macronix.c               | 38 ++++++++++++++-----
 include/linux/mtd/spinand.h                   |  9 +++++
 4 files changed, 66 insertions(+), 10 deletions(-)

-- 
2.25.1