linux-kernel - Re: [RFC PATCH] arm64: broadcom: bcm2712: Rework rp1 overlay handling

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Message-ID: <ae5d1a37-9af9-46a2-9ca0-83c276248931@kernel.org>
Date: Fri, 5 Dec 2025 09:08:54 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Florian Fainelli <florian.fainelli@...adcom.com>
Cc: "Rob Herring (Arm)" <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Phil Elwell
 <phil@...pberrypi.com>,
 Broadcom internal kernel review list
 <bcm-kernel-feedback-list@...adcom.com>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, Conor Dooley <conor+dt@...nel.org>,
 linux-rpi-kernel@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
 Andrea della Porta <andrea.porta@...e.com>
Subject: Re: [RFC PATCH] arm64: broadcom: bcm2712: Rework rp1 overlay handling

On 17/11/2025 22:15, Rob Herring (Arm) wrote:
> It's a requirement that DT overlays be applied at build time in order to
> validate them as overlays are not validated on their own.
> 
> Simply adding a build time target is possible, but it's also not desirable
> to have targets which include the overlay contents and apply the same
> overlay.
> 
> Rework the targets such that there are 2 overlays: the existing RP1 overlay
> and the board specific configuration of the RP1 (bcm2712-rpi-5-b.dtso).
> 
> Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
> ---
> The missing applying of rp1.dtbo will soon be a warning[1].
> 
> The comment in bcm2712-rpi-5-b.dts(o) needs updating or removing. The RP1
> driver or userspace handling of the overlay probably needs updating to
> handle the 2 overlays. IIRC, I think we can apply overlays to overlays
> which may be useful here. If not, adding that to the tools should be
> possible.
> 
> [1] https://lore.kernel.org/all/20251114222759.4181152-1-robh@kernel.org/
> ---
>  arch/arm64/boot/dts/broadcom/Makefile                 | 10 ++++++++--
>  ...m2712-d-rpi-5-b.dts => bcm2712-d-rpi-5-b-base.dts} |  2 +-
>  .../{bcm2712-rpi-5-b.dts => bcm2712-rpi-5-b.dtso}     | 11 +++++------


So now Linus' tree has warnings. Can this be applied by anyone around
Broadcom and sent as fixes?


Best regards,
Krzysztof