linux-kernel - Re: [PATCH 1/4] arm64: dts: mediatek: mt7622: add 'serial' cell to efuse

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Message-ID: <87179c9f-cc7f-446f-9e8d-c84bddb48660@collabora.com>
Date: Wed, 17 Sep 2025 11:06:13 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Daniel Golle <daniel@...rotopia.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Matthias Brugger <matthias.bgg@...il.com>,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 1/4] arm64: dts: mediatek: mt7622: add 'serial' cell to
 efuse

Il 17/09/25 01:05, Daniel Golle ha scritto:
> The efuse of the MediaTek MT7622 contains an 8-byte unique identifier.
> Add a 'serial' 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 R64 which
> doesn't have any factory-assigned addresses.

Sorry, but I don't get why this is named "serial" and not "soc-uuid".

Care to explain?

Cheers,
Angelo

> 
> Signed-off-by: Daniel Golle <daniel@...rotopia.org>
> ---
>   arch/arm64/boot/dts/mediatek/mt7622.dtsi | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt7622.dtsi b/arch/arm64/boot/dts/mediatek/mt7622.dtsi
> index 917fa39a74f8..0b9803a183b9 100644
> --- a/arch/arm64/boot/dts/mediatek/mt7622.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt7622.dtsi
> @@ -278,6 +278,10 @@ efuse: efuse@...06000 {
>   		#address-cells = <1>;
>   		#size-cells = <1>;
>   
> +		serial@140 {
> +			reg = <0x140 0x8>;
> +		};
> +
>   		thermal_calibration: calib@198 {
>   			reg = <0x198 0xc>;
>   		};