linux-kernel - Re: [PATCH] arm64: dts: ti: k3-am642-hummingboard-t: convert overlay to board dts

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Message-ID: <32c1f44c-6bc7-4722-9f73-743ea15cdcbd@solid-run.com>
Date: Tue, 12 Nov 2024 05:05:42 +0000
From: Josua Mayer <josua@...id-run.com>
To: Nishanth Menon <nm@...com>, Tero Kristo <kristo@...nel.org>, Rob Herring
	<robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
	<conor+dt@...nel.org>
CC: Geert Uytterhoeven <geert@...ux-m68k.org>, Vignesh Raghavendra
	<vigneshr@...com>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: ti: k3-am642-hummingboard-t: convert overlay
 to board dts

Am 01.11.24 um 15:16 schrieb Josua Mayer:
> SolidRun HummingBoard-T has two options for M.2 connector, supporting
> either PCI-E or USB-3.1 Gen 1 - depending on configuration of a mux
> on the serdes lane.
> The required configurations in device-tree were modeled as overlays.
>
> The USB-3.1 overlay uses /delete-property/ to unset a boolean property
> on the usb controller limiting it to USB-2.0 by default.
> Overlays can not delete a property from the base dtb, therefore this
> overlay is at this time useless.
>
> Convert both overlays into full dts by including the base board dts.
> While the pcie overlay was functional, both are converted for a
> consistent user experience when selecting between the two mutually
> exclusive configurations.
>
> Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Closes: https://lore.kernel.org/linux-devicetree/CAMuHMdXTgpTnJ9U7egC2XjFXXNZ5uiY1O+WxNd6LPJW5Rs5KTw@mail.gmail.com
> Fixes: bbef42084cc1 ("arm64: dts: ti: hummingboard-t: add overlays for m.2 pci-e and usb-3")
> Signed-off-by: Josua Mayer <josua@...id-run.com>
> ---
>   arch/arm64/boot/dts/ti/Makefile                            |  4 ----
>   ...gboard-t-pcie.dtso => k3-am642-hummingboard-t-pcie.dts} | 14 ++++++++------
>   ...gboard-t-usb3.dtso => k3-am642-hummingboard-t-usb3.dts} | 13 ++++++++-----
>   3 files changed, 16 insertions(+), 15 deletions(-)
>
Please hold off on this patch for the moment,
Thanks to some comments from Geert I wish to submit an alternative
solution via separate patch-set, for further discussion.