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[209.85.220.41]) by mx.google.com with SMTPS id a640c23a62f3a-b842a21026bsor153136566b.5.2026.01.07.11.45.46 for (Google Transport Security); Wed, 07 Jan 2026 11:45:46 -0800 (PST) Received-SPF: pass (google.com: domain of dario.binacchi@amarulasolutions.com designates 209.85.220.41 as permitted sender) client-ip=209.85.220.41; X-Gm-Gg: AY/fxX7Js09zt5XsuW5QS4nhSIBP+6sUhinjhMkdtMAnpXq/eSzJ/BNX0QXP0PZDzQP OHqCLnvtQ60HHIAasTuy9AF18p+6sVKa4Nd3IAsrER1WUZbwj/TH/hxQiI1sQj3vRR138T6ikt0 I8ItJ61qhukLGN2j3A3U0tZBDqlk+Y1RFza88q3/OjXZGH8pzVVmAC/zLVUUKebjbGc2Cxe0gbp kLGwCUHWvXK8eitPuM3xv1B04tPCkqkEav4IgokmOBQaQP2+6yQ3aCKIKKGyM/9mDdKKL8azGJr CBCa/nvQHEtDi2EIr2tl7aW8VVfzKk5/RDCx1Mxu+Z3fgeQ5rmnQVH4wAkJQDa7x9o77RuPTM/n 4TKOj9NOJy7lNXb6lYVngye3ZvABuLAfv+FT0Ff91oTmtfN88oNOBfvaW0FYUO5pPk9Ep5ResyN 2p6UqxBVKsHQOHgil1JqTWQGRXo9wBTFO/qMRqvjomqwICmKkq14zg5PtOVoUcRkTw8H8GVe1wb dg2m03iPuCYnSeTZ4l7xrPJD0/m8THVwk0= X-Received: by 2002:a17:907:1b21:b0:b73:6f8c:6127 with SMTP id a640c23a62f3a-b8445031bf9mr384207966b.12.1767815145741; Wed, 07 Jan 2026 11:45:45 -0800 (PST) Received: from dario-ThinkPad-P14s-Gen-5.amarulasolutions.com ([2.196.41.122]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b842a233fb3sm591201066b.12.2026.01.07.11.45.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Jan 2026 11:45:45 -0800 (PST) From: Dario Binacchi To: linux-kernel@vger.kernel.org Cc: linux-amarula@amarulasolutions.com, Dario Binacchi , Alexandre Torgue , Conor Dooley , Krzysztof Kozlowski , Maxime Coquelin , Rob Herring , Srinivas Kandagatla , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-stm32@st-md-mailman.stormreply.com Subject: [PATCH 1/2] dt-bindings: nvmem: add STM32 TAMP NVRAM Date: Wed, 7 Jan 2026 20:45:32 +0100 Message-ID: <20260107194541.1843999-1-dario.binacchi@amarulasolutions.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 X-Original-Sender: dario.binacchi@amarulasolutions.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@amarulasolutions.com header.s=google header.b=J5yI5QGz; spf=pass (google.com: domain of dario.binacchi@amarulasolutions.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=dario.binacchi@amarulasolutions.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=amarulasolutions.com; dara=neutral header.i=@amarulasolutions.com Content-Type: text/plain; charset="UTF-8" Precedence: list Mailing-list: list linux-amarula@amarulasolutions.com; contact linux-amarula+owners@amarulasolutions.com List-ID: X-Spam-Checked-In-Group: linux-amarula@amarulasolutions.com X-Google-Group-Id: 476853432473 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , 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 --- .../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 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..e03469fbe436 --- /dev/null +++ b/Documentation/devicetree/bindings/nvmem/st,stm32-tamp-nvram.yaml @@ -0,0 +1,55 @@ +# 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 TAMP's NVRAM + +description: | + The TAMP peripheral integrates, amongst others, Non Volatile RAM + (NVRAM) with 32/128 32-bit backup registers which can be used by + software to store information or communicate with a boot loader. + +maintainers: + - Dario Binacchi + +allOf: + - $ref: nvmem.yaml# + +properties: + compatible: + enum: + - st,stm32mp15-tamp-nvram + - st,stm32mp25-tamp-nvram + + reg: + maxItems: 1 + +required: + - compatible + - reg + +unevaluatedProperties: false + +examples: + - | + nvram: nvram@46010100 { + compatible = "st,stm32mp25-tamp-nvram"; + reg = <0x46010100 0x200>; + + nvmem-layout { + compatible = "fixed-layout"; + #address-cells = <1>; + #size-cells = <1>; + + fwu_info: tamp-bkp@c0 { + reg = <0xc0 0x4>; + }; + + boot_mode: tamp-bkp@180 { + reg = <0x180 0x4>; + }; + }; + }; +... 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[209.85.220.41]) by mx.google.com with SMTPS id a640c23a62f3a-b842c018b62sor95097166b.1.2026.01.07.11.45.47 for (Google Transport Security); Wed, 07 Jan 2026 11:45:48 -0800 (PST) Received-SPF: pass (google.com: domain of dario.binacchi@amarulasolutions.com designates 209.85.220.41 as permitted sender) client-ip=209.85.220.41; X-Gm-Gg: AY/fxX5NqEVRwB2l3vzNPTmvdd/Ovs3weo8SxQP0Q+SjWoYLEkOJOiZEL5VvRTA9eOb eUpUbkyIXWHk9FVOdrx3VHkKXdjDffTNupDP+M/16Vc5B12pdOIz2yHEq4wzJtyYSBS0ZDD9gnA o0P21d2e38Wd82+YmAc6xAfQrxwt8bYMBnlYHZAFfH+hEMI3Q4mMBs1b7q9/VKWHFLvG/FGUyCV QKtyRCjyh2yC4n0Vj2hn8IX3qCjAf7QKbRiQUqRL//W9LUC2gfFFy2mhycQjQoaZfubcwrjYxcP XOMLQmMIRo8BoZrsY1L0H0Zfkeq6KsbscyfIAU+xajHovwUiNnDa7eNN76Kyj1pDKBJP80etuew KUrKgHTL2yxpKaYtCZE4/kn0p7hJV8ycqJB0sLCB6lMA3RsIJXecx9AiqPuD25Wt5aZ/gzyJgY9 c/vziAGZCDjnPlZo8auBwKYZrxctUBx4V58frLBo+r7+CZz3cHJELKfa4syNWYFPVV+Fys/pgPR 5qMjELZr0qeyY6XehI/jqNcCH3psY5GQ3c= X-Received: by 2002:a17:907:d0a:b0:b76:d734:d459 with SMTP id a640c23a62f3a-b844506436fmr387336366b.57.1767815147362; Wed, 07 Jan 2026 11:45:47 -0800 (PST) Received: from dario-ThinkPad-P14s-Gen-5.amarulasolutions.com ([2.196.41.122]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b842a233fb3sm591201066b.12.2026.01.07.11.45.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Jan 2026 11:45:46 -0800 (PST) From: Dario Binacchi To: linux-kernel@vger.kernel.org Cc: linux-amarula@amarulasolutions.com, Dario Binacchi , Alexandre Torgue , Conor Dooley , Krzysztof Kozlowski , Maxime Coquelin , Rob Herring , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-stm32@st-md-mailman.stormreply.com Subject: [PATCH 2/2] arm64: dts: st: add TAMP-NVRAM support for STM32MP25 Date: Wed, 7 Jan 2026 20:45:33 +0100 Message-ID: <20260107194541.1843999-2-dario.binacchi@amarulasolutions.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260107194541.1843999-1-dario.binacchi@amarulasolutions.com> References: <20260107194541.1843999-1-dario.binacchi@amarulasolutions.com> MIME-Version: 1.0 X-Original-Sender: dario.binacchi@amarulasolutions.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@amarulasolutions.com header.s=google header.b=iSFciIkh; spf=pass (google.com: domain of dario.binacchi@amarulasolutions.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=dario.binacchi@amarulasolutions.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=amarulasolutions.com; dara=neutral header.i=@amarulasolutions.com Content-Type: text/plain; charset="UTF-8" Precedence: list Mailing-list: list linux-amarula@amarulasolutions.com; contact linux-amarula+owners@amarulasolutions.com List-ID: X-Spam-Checked-In-Group: linux-amarula@amarulasolutions.com X-Google-Group-Id: 476853432473 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , Add the TAMP node along with its NVRAM child node and define the fixed-layout for fwu_info and boot_mode registers. The TAMP (Tamper and backup registers) block is a system controller that provides access to backup registers as NVMEM storage that persists across reboots. Signed-off-by: Dario Binacchi --- arch/arm64/boot/dts/st/stm32mp251.dtsi | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/arch/arm64/boot/dts/st/stm32mp251.dtsi b/arch/arm64/boot/dts/st/stm32mp251.dtsi index a8e6e0f77b83..c7839e732f31 100644 --- a/arch/arm64/boot/dts/st/stm32mp251.dtsi +++ b/arch/arm64/boot/dts/st/stm32mp251.dtsi @@ -2084,6 +2084,32 @@ rtc: rtc@46000000 { status = "disabled"; }; + tamp: tamp@46010000 { + compatible = "st,stm32-tamp", "syscon", "simple-mfd"; + #address-cells = <1>; + #size-cells = <1>; + reg = <0x46010000 0x400>; + ranges; + + nvram: nvram@46010100 { + compatible = "st,stm32mp25-tamp-nvram"; + reg = <0x46010100 0x200>; + nvmem-layout { + compatible = "fixed-layout"; + #address-cells = <1>; + #size-cells = <1>; + + fwu_info: tamp-bkp@c0 { + reg = <0xc0 0x4>; + }; + + boot_mode: tamp-bkp@180 { + reg = <0x180 0x4>; + }; + }; + }; + }; + pinctrl_z: pinctrl@46200000 { #address-cells = <1>; #size-cells = <1>;