linux-kernel - [PATCH 4/4] arm64: dts: mediatek: mt7988a: add 'serial' cell to efuse

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Message-ID: <e36e32d8bbadfd52176751e39ee3ce1ac7c42063.1758063737.git.daniel@makrotopia.org>
Date: Wed, 17 Sep 2025 00:05:44 +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 4/4] arm64: dts: mediatek: mt7988a: add 'serial' cell to efuse

The efuse of the MediaTek MT7988 contains a 16-byte unique identifier.
Add a 'serial' cell covering those 16 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 R4 which
doesn't have any factory-assigned addresses.

Signed-off-by: Daniel Golle <daniel@...rotopia.org>
---
 arch/arm64/boot/dts/mediatek/mt7988a.dtsi | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt7988a.dtsi b/arch/arm64/boot/dts/mediatek/mt7988a.dtsi
index 366203a72d6d..4a70f915f435 100644
--- a/arch/arm64/boot/dts/mediatek/mt7988a.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt7988a.dtsi
@@ -714,6 +714,10 @@ efuse@...50000 {
 			#address-cells = <1>;
 			#size-cells = <1>;
 
+			serial@140 {
+				reg = <0x140 0x10>;
+			};
+
 			lvts_calibration: calib@918 {
 				reg = <0x918 0x28>;
 			};
-- 
2.51.0