linux-kernel - [PATCH 2/2] arm64: dts: st: add TAMP-NVRAM support for STM32MP25

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Message-ID: <20260107194541.1843999-2-dario.binacchi@amarulasolutions.com>
Date: Wed,  7 Jan 2026 20:45:33 +0100
From: Dario Binacchi <dario.binacchi@...rulasolutions.com>
To: linux-kernel@...r.kernel.org
Cc: linux-amarula@...rulasolutions.com,
	Dario Binacchi <dario.binacchi@...rulasolutions.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Conor Dooley <conor+dt@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Rob Herring <robh@...nel.org>,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-stm32@...md-mailman.stormreply.com
Subject: [PATCH 2/2] arm64: dts: st: add TAMP-NVRAM support for STM32MP25

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 <dario.binacchi@...rulasolutions.com>

---

 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@...00000 {
 			status = "disabled";
 		};
 
+		tamp: tamp@...10000 {
+			compatible = "st,stm32-tamp", "syscon", "simple-mfd";
+			#address-cells = <1>;
+			#size-cells = <1>;
+			reg = <0x46010000 0x400>;
+			ranges;
+
+			nvram: nvram@...10100 {
+				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@...00000 {
 			#address-cells = <1>;
 			#size-cells = <1>;
-- 
2.43.0

base-commit: f0b9d8eb98dfee8d00419aa07543bdc2c1a44fb1
branch: stm32-tamp-nvram