[Linux-stm32] [PATCH v5 0/8] 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 at foss.st.com>
---
Changes in v5:
- include DTS patches previously submitted separately in https://patchwork.kernel.org/series/1176665/
- Link to v4: https://patch.msgid.link/20261104-upstream_nvram_reworked-v4-0-144024496a44@foss.st.com

Changes in v4:
- Make usage of of_device_get_match_data() wrapper.
- Rework ioremap of syscon's memory region to avoid overlapping 
  between parent and child node. This allows to remove 
  bkpregs_regmap_cfg declaration for both STM32MP1 and STM32MP2.
_ Add select MFD_SYSCON in Kconfig.
- Link to v3: https://patch.msgid.link/20261016-upstream_nvram_reworked-v3-0-f65908490cf7@foss.st.com

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@foss.st.com

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@foss.st.com

To: Simeon Marijon <simeon.marijon at foss.st.com>
To: Patrice Chotard <patrice.chotard at foss.st.com>
To: Srinivas Kandagatla <srini at kernel.org>
To: Rob Herring <robh at kernel.org>
To: Krzysztof Kozlowski <krzk+dt at kernel.org>
To: Conor Dooley <conor+dt at kernel.org>
To: Maxime Coquelin <mcoquelin.stm32 at gmail.com>
To: Alexandre Torgue <alexandre.torgue at foss.st.com>
To: Christophe Roullier <christophe.roullier at foss.st.com>
Cc: linux-stm32 at st-md-mailman.stormreply.com
Cc: devicetree at vger.kernel.org
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-kernel at vger.kernel.org

---
Patrice Chotard (3):
      dt-bindings: arm: stm32: allow TAMP nvram child node for syscon
      arm64: dts: st: add TAMP backup register in stm32mp211.dtsi
      arm64: dts: st: add TAMP backup register in stm32mp231.dtsi

Simeon Marijon (5):
      dt-bindings: nvmem: add STM32MPX TAMP backup registers
      nvmem: stm32: add TAMP nvmem driver
      ARM: dts: stm32: add TAMP backup register in stm32mp131.dtsi
      ARM: dts: stm32: add TAMP backup register in stm32mp151.dtsi
      arm64: dts: st: add TAMP backup register in stm32mp251.dtsi

 .../bindings/arm/stm32/st,stm32-syscon.yaml        |  38 +-
 .../bindings/nvmem/st,stm32-tamp-nvram.yaml        |  57 ++
 MAINTAINERS                                        |   8 +
 arch/arm/boot/dts/st/stm32mp131.dtsi               |  34 ++
 arch/arm/boot/dts/st/stm32mp151.dtsi               |  83 +++
 arch/arm64/boot/dts/st/stm32mp211.dtsi             |  31 +
 arch/arm64/boot/dts/st/stm32mp231.dtsi             |  31 +
 arch/arm64/boot/dts/st/stm32mp251.dtsi             |  31 +
 drivers/nvmem/Kconfig                              |  11 +
 drivers/nvmem/Makefile                             |   2 +
 drivers/nvmem/stm32-tamp-nvram.c                   | 680 +++++++++++++++++++++
 11 files changed, 1003 insertions(+), 3 deletions(-)
---
base-commit: 6628e7d4c6b25c8d18f1345e3a20d21829aae7e4
change-id: 20260909-upstream_nvram_reworked-f84a4b37817c

Best regards,
--  
Patrice Chotard <patrice.chotard at foss.st.com>