[PATCH v2 1/3] dt-bindings: nvmem: add STM32MPX TAMP backup registers
From: Patrice Chotard <patrice.chotard@foss.st.com>
Date: 2026-09-30 07:42:11
Also in:
linux-devicetree, lkml
Subsystem:
nvmem framework, open firmware and flattened device tree bindings, the rest · Maintainers:
Srinivas Kandagatla, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
From: Simeon Marijon <redacted> Adds the binding documentation for TAMP backup registers. The backup registers is a part of the TAMP device of STM32 MPU. Signed-off-by: Simeon Marijon <redacted> Reviewed-by: Rob Herring (Arm) <robh@kernel.org> Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com> --- .../bindings/nvmem/st,stm32-tamp-nvram.yaml | 57 ++++++++++++++++++++++ MAINTAINERS | 7 +++ 2 files changed, 64 insertions(+)
diff --git a/Documentation/devicetree/bindings/nvmem/st,stm32-tamp-nvram.yaml b/Documentation/devicetree/bindings/nvmem/st,stm32-tamp-nvram.yaml
new file mode 100644
index 000000000000..4af3b88db566
--- /dev/null
+++ b/Documentation/devicetree/bindings/nvmem/st,stm32-tamp-nvram.yaml@@ -0,0 +1,57 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/nvmem/st,stm32-tamp-nvram.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: STMicroelectronics STM32 backup registers as NVMEM + +description: | + This represents STM32 backup registers area presented as nvmem cells. + This contains various information (e.g. boot mode passed to bootloaders). + +maintainers: + - Simeon Marijon <simeon.marijon@foss.st.com> + - Patrice Chotard <patrice.chotard@foss.st.com> + +allOf: + - $ref: nvmem.yaml# + +properties: + compatible: + enum: + - st,stm32mp15-tamp-nvram + - st,stm32mp25-tamp-nvram + + reg: + description: + TAMP Registers bank location and size. + maxItems: 1 + +required: + - compatible + - reg + +unevaluatedProperties: false + +examples: + - | + nvram: nvram@5c00a100 { + reg = <0x5c00a100 0x80>; + compatible = "st,stm32mp15-tamp-nvram"; + + nvmem-layout { + compatible = "fixed-layout"; + #address-cells = <1>; + #size-cells = <1>; + + /* Data cells */ + wakeup_sec: tamp-bkp@0 { + reg = <0x0 0x4>; + }; + boot_mode: tamp-bkp@50 { + /*see boot mode selection feature*/ + reg = <0x50 0x4>; + }; + }; + };
diff --git a/MAINTAINERS b/MAINTAINERS
index 3a19da74d00c..b634c037c229 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS@@ -26261,6 +26261,13 @@ F: Documentation/arch/arm/stm32/stm32-dma-mdma-chaining.rst F: Documentation/devicetree/bindings/dma/stm32/ F: drivers/dma/stm32/ +STM32 TAMP DRIVERS +M: Simeon Marijon <simeon.marijon@foss.st.com> +M: Patrice Chotard <patrice.chotard@foss.st.com> +L: linux-stm32@st-md-mailman.stormreply.com (moderated for non-subscribers) +S: Maintained +F: Documentation/devicetree/bindings/nvmem/st,stm32-tamp-nvram.yaml + STM32 TIMER/LPTIMER DRIVERS M: Fabrice Gasnier <fabrice.gasnier@foss.st.com> S: Maintained
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2.43.0