linux-kernel - Re: [PATCH] arm64: dts: nuvoton: Add missing "device

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Message-ID: <7e20473324c8da16fa86f72af950b8e8eac92a1b.camel@codeconstruct.com.au>
Date: Thu, 08 Jan 2026 17:39:19 +1030
From: Andrew Jeffery <andrew@...econstruct.com.au>
To: "Rob Herring (Arm)" <robh@...nel.org>
Cc: openbmc@...ts.ozlabs.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Avi Fishman <avifishman70@...il.com>, Tomer
 Maimon	 <tmaimon77@...il.com>, Tali Perry <tali.perry1@...il.com>, Patrick
 Venture	 <venture@...gle.com>, Nancy Yuen <yuenn@...gle.com>, Benjamin Fair
	 <benjaminfair@...gle.com>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor
 Dooley <conor+dt@...nel.org>
Subject: Re: [PATCH] arm64: dts: nuvoton: Add missing "device_type" property
 on memory node

On Mon, 2026-01-05 at 13:32 -0600, Rob Herring (Arm) wrote:
> "device_type" is required for memory nodes, but is missing on Nuvoton
> npcm845-evb.
> 
> Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
> ---
>  arch/arm64/boot/dts/nuvoton/nuvoton-npcm845-evb.dts | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/boot/dts/nuvoton/nuvoton-npcm845-evb.dts b/arch/arm64/boot/dts/nuvoton/nuvoton-npcm845-evb.dts
> index 2638ee1c3846..5edf5d13342d 100644
> --- a/arch/arm64/boot/dts/nuvoton/nuvoton-npcm845-evb.dts
> +++ b/arch/arm64/boot/dts/nuvoton/nuvoton-npcm845-evb.dts
> @@ -17,6 +17,7 @@ chosen {
>  	};
>  
>  	memory@0 {
> +		device_type = "memory";
>  		reg = <0x0 0x0 0x0 0x40000000>;
>  	};
>  

Hmm, we have quite a few other offenders under arch/arm/boot/dts/aspeed
too. I expect this should be caught by CHECK_DTBS=y?

Digging back through my build archives, warnings have cropped up, but
only for when I'm building the arm64 or arm multi_v{5,7} defconfigsm
and seemingly not the aspeed_g5 defconfig.

executions/2024Y/2024Y08m/2024Y08m13d10H09M/20240812145816.3301570-1-tmaimon77@...il.com.md:      /home/andrew/src/kernel.org/linux/openbmc/build.npcm/arch/arm64/boot/dts/nuvoton/nuvoton-npcm845-evb.dtb: /: memory: 'device_type' is a required property
executions/2025Y/2025Y04m/2025Y04m03d21H04M/baseline-build:/home/andrew/src/kernel.org/linux/origin/build.multi_v5/arch/arm/boot/dts/nuvoton/nuvoton-npcm750-evb.dtb: /: memory: False schema does not allow {'device_type': ['memory'], 'reg': [[0, 536870912]]}
executions/2025Y/2025Y04m/2025Y04m04d00H57M/baseline-build:/home/andrew/src/kernel.org/linux/origin/build.multi_v5/arch/arm/boot/dts/nuvoton/nuvoton-npcm750-evb.dtb: /: memory: False schema does not allow {'device_type': ['memory'], 'reg': [[0, 536870912]]}
executions/2025Y/2025Y04m/2025Y04m04d01H10M/baseline-build:/home/andrew/src/kernel.org/linux/origin/build.multi_v5/arch/arm/boot/dts/nuvoton/nuvoton-npcm750-evb.dtb: /: memory: False schema does not allow {'device_type': ['memory'], 'reg': [[0, 536870912]]}
executions/2025Y/2025Y04m/2025Y04m08d10H18M/baseline-build:/home/andrew/src/kernel.org/linux/origin/build.multi_v7/arch/arm/boot/dts/nuvoton/nuvoton-npcm750-evb.dtb: /: memory: False schema does not allow {'device_type': ['memory'], 'reg': [[0, 536870912]]}
executions/2025Y/2025Y05m/2025Y05m07d11H43M/03-diff-ref-curr: /home/andrew/src/kernel.org/linux/origin/build.arm64.default/arch/arm64/boot/dts/nuvoton/nuvoton-npcm845-evb.dtb: /: memory@0: 'device_type' is a required property
executions/2025Y/2025Y05m/2025Y05m07d11H43M/baseline-build:/home/andrew/src/kernel.org/linux/origin/build.arm64.default/arch/arm64/boot/dts/nuvoton/nuvoton-npcm845-evb.dtb: /: memory@0: 'device_type' is a required property
executions/2025Y/2025Y06m/2025Y06m13d11H17M/03-diff-ref-curr: /home/andrew/src/kernel.org/linux/origin/build.arm64.default/arch/arm64/boot/dts/nuvoton/nuvoton-npcm845-evb.dtb: / (nuvoton,npcm845-evb): memory@0: 'device_type' is a required property
executions/2025Y/2025Y06m/2025Y06m13d11H17M/baseline-build:/home/andrew/src/kernel.org/linux/origin/build.arm64.default/arch/arm64/boot/dts/nuvoton/nuvoton-npcm845-evb.dtb: / (nuvoton,npcm845-evb): memory@0: 'device_type' is a required property
executions/2025Y/2025Y07m/2025Y07m21d10H53M/baseline-build:/home/andrew/src/kernel.org/linux/origin/build.arm64.default/arch/arm64/boot/dts/nuvoton/nuvoton-npcm845-evb.dtb: / (nuvoton,npcm845-evb): memory@0: 'device_type' is a required property
executions/2025Y/2025Y07m/2025Y07m21d10H53M/make-dtbs-check: /home/andrew/src/kernel.org/linux/origin/build.arm64.default/arch/arm64/boot/dts/nuvoton/nuvoton-npcm845-evb.dtb: / (nuvoton,npcm845-evb): memory@0: 'device_type' is a required property
executions/2025Y/2025Y07m/2025Y07m21d12H20M/baseline-build:/home/andrew/src/kernel.org/linux/origin/build.arm64.default/arch/arm64/boot/dts/nuvoton/nuvoton-npcm845-evb.dtb: / (nuvoton,npcm845-evb): memory@0: 'device_type' is a required property
executions/2025Y/2025Y07m/2025Y07m21d12H20M/make-dtbs-check: /home/andrew/src/kernel.org/linux/origin/build.arm64.default/arch/arm64/boot/dts/nuvoton/nuvoton-npcm845-evb.dtb: / (nuvoton,npcm845-evb): memory@0: 'device_type' is a required property
executions/2025Y/2025Y07m/2025Y07m21d13H58M/baseline-build:/home/andrew/src/kernel.org/linux/origin/build.arm.multi_v7/arch/arm/boot/dts/nuvoton/nuvoton-npcm750-evb.dtb: / (nuvoton,npcm750-evb): memory: False schema does not allow {'device_type': ['memory'], 'reg': [[0, 536870912]]}

I don't yet understand why that is, but I'll do some digging. I expect
there will be some fixes to send once I figure it out.

Andrew