linux-kernel - [PATCH v2 2/4] arm64: dts: mediatek: mt7986a: add 'soc-uuid' cell to efuse

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Message-ID: <fe0b2ea1f0d8081c703459f5e42392ac9f45cd80.1758369130.git.daniel@makrotopia.org>
Date: Sat, 20 Sep 2025 12:56:51 +0100
From: Daniel Golle <daniel@...rotopia.org>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: [PATCH v2 2/4] arm64: dts: mediatek: mt7986a: add 'soc-uuid' cell to
 efuse

The efuse of the MediaTek MT7986 contains an 8-byte unique identifier.
Add a 'soc-uuid' cell covering those 8 bytes to the nvmem defininition
of the efuse to allow easy access from userspace, eg. to generate a
persistent random MAC address on boards like the BananaPi R3 which
doesn't have any factory-assigned addresses.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Signed-off-by: Daniel Golle <daniel@...rotopia.org>
---
 arch/arm64/boot/dts/mediatek/mt7986a.dtsi | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt7986a.dtsi b/arch/arm64/boot/dts/mediatek/mt7986a.dtsi
index a8972330a7b8..7790601586cc 100644
--- a/arch/arm64/boot/dts/mediatek/mt7986a.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt7986a.dtsi
@@ -450,6 +450,10 @@ efuse: efuse@...00000 {
 			#address-cells = <1>;
 			#size-cells = <1>;
 
+			soc-uuid@140 {
+				reg = <0x140 0x8>;
+			};
+
 			thermal_calibration: calib@274 {
 				reg = <0x274 0xc>;
 			};
-- 
2.51.0