[PATCH v3 0/3] Add STM32 TAMP nvram driver support

[Patrice Chotard]

Propose bindings and driver to enable TAMP nvram driver
support for STM32MP SoC's family.
It allows to expose TAMP backup registers as nvmem cells.

Signed-off-by: Patrice Chotard <patrice.chotard@xxxxxxxxxxx>
---
Changes in v3:
- Fix issue found by sashiko-bot:
  - rely on the already resolved priv->data->nb_zones instead of 
    of_device_is_compatible() to set priv->bkpreg_access
  - Fix max_register of stm32mp1_tamp_nvram_regmap_cfg and 
    stm32mp2_tamp_nvram_regmap_cfg
  - Update zones_end type to int*
  - Replace both memcpy by put_unaligned_le32 and get_unaligned_le32
  - Link to v2: https://patch.msgid.link/20260930-upstream_nvram_reworked-v2-0-cfda749ee0b7@xxxxxxxxxxx

Changes in v2:
- Update commit title of nvmem dt-bindings's patch.
- Add required compatible for patternProperties in stm32/st,stm32-syscon.yaml.
- Fix issue found by sashiko-bot:
  - Add freeing compartment_owner.
  - Replace regmap_read/regmap_write by regmap_update_bits in stm32_tamp_nvram_write_byte().
  - Update error return in stm32_tamp_nvram_read_byte(), stm32_tamp_nvram_write_byte(),
    stm32_tamp_nvram_read() and stm32_tamp_nvram_write() to return the actual regmap_read() /
    regmap_write() error instead of -EIO.
 - Add freeing field and update error return values for stm32_tamp_nvram_get_backup_zones().
 - Update error return for stm32_tamp_nvram_probe().
- Link to v1: https://patch.msgid.link/20260910-upstream_nvram_reworked-v1-0-521c16175cef@xxxxxxxxxxx

To: Simeon Marijon <simeon.marijon@xxxxxxxxxxx>
To: Patrice Chotard <patrice.chotard@xxxxxxxxxxx>
To: Srinivas Kandagatla <srini@xxxxxxxxxx>
To: Rob Herring <robh@xxxxxxxxxx>
To: Krzysztof Kozlowski <krzk+dt@xxxxxxxxxx>
To: Conor Dooley <conor+dt@xxxxxxxxxx>
To: Maxime Coquelin <mcoquelin.stm32@xxxxxxxxx>
To: Alexandre Torgue <alexandre.torgue@xxxxxxxxxxx>
To: Christophe Roullier <christophe.roullier@xxxxxxxxxxx>
Cc: linux-stm32@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: devicetree@xxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx

---
Patrice Chotard (1):
      dt-bindings: arm: stm32: allow TAMP nvram child node for syscon

Simeon Marijon (2):
      dt-bindings: nvmem: add STM32MPX TAMP backup registers
      nvmem: stm32: add TAMP nvmem driver

 .../bindings/arm/stm32/st,stm32-syscon.yaml        |  30 +
 .../bindings/nvmem/st,stm32-tamp-nvram.yaml        |  57 ++
 MAINTAINERS                                        |   8 +
 drivers/nvmem/Kconfig                              |  10 +
 drivers/nvmem/Makefile                             |   2 +
 drivers/nvmem/stm32-tamp-nvram.c                   | 741 +++++++++++++++++++++
 6 files changed, 848 insertions(+)
---
base-commit: cee9395acd8043be0644b25c34bfa86623f2b935
change-id: 20260909-upstream_nvram_reworked-f84a4b37817c

Best regards,
--  
Patrice Chotard <patrice.chotard@xxxxxxxxxxx>