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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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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>; -- 2.43.0 base-commit: f0b9d8eb98dfee8d00419aa07543bdc2c1a44fb1 branch: stm32-tamp-nvram