[PATCH 1/2] dt-bindings: nvmem: add STM32 TAMP NVRAM

[Rob Herring]

On Wed, 07 Jan 2026 20:45:32 +0100, Dario Binacchi wrote:
> Add devicetree bindings for TAMP backup registers. These 32-bit
> registers are retained in all low-power modes and in VBAT mode. As a
> result, they can also be used to store sensitive data because their
> content is protected by a tamper detection circuit.
> 
> Signed-off-by: Dario Binacchi <dario.binacchi at amarulasolutions.com>
> ---
> 
>  .../bindings/nvmem/st,stm32-tamp-nvram.yaml   | 55 +++++++++++++++++++
>  1 file changed, 55 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/nvmem/st,stm32-tamp-nvram.yaml
> 


My bot found new DTB warnings on the .dts files added or changed in this
series.

Some warnings may be from an existing SoC .dtsi. Or perhaps the warnings
are fixed by another series. Ultimately, it is up to the platform
maintainer whether these warnings are acceptable or not. No need to reply
unless the platform maintainer has comments.

If you already ran DT checks and didn't see these error(s), then
make sure dt-schema is up to date:

  pip3 install dtschema --upgrade


This patch series was applied (using b4) to base:
 Base: f0b9d8eb98dfee8d00419aa07543bdc2c1a44fb1 (use --merge-base to override)

If this is not the correct base, please add 'base-commit' tag
(or use b4 which does this automatically)

New warnings running 'make CHECK_DTBS=y for arch/arm64/boot/dts/st/' for 20260107194541.1843999-1-dario.binacchi at amarulasolutions.com:

arch/arm64/boot/dts/st/stm32mp257f-dk.dtb: tamp at 46010000 (st,stm32-tamp): '#address-cells', '#size-cells', 'nvram at 46010100', 'ranges' do not match any of the regexes: '^pinctrl-[0-9]+$'
	from schema $id: http://devicetree.org/schemas/arm/stm32/st,stm32-syscon.yaml
arch/arm64/boot/dts/st/stm32mp257f-ev1.dtb: tamp at 46010000 (st,stm32-tamp): '#address-cells', '#size-cells', 'nvram at 46010100', 'ranges' do not match any of the regexes: '^pinctrl-[0-9]+$'
	from schema $id: http://devicetree.org/schemas/arm/stm32/st,stm32-syscon.yaml