linux-kernel - Re: [PATCH RFC 0/2] arm64: tegra: Add NVIDIA Jetson Nano 2GB Developer Kit support

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Message-ID: <CALHNRZ_Zo6w2KgRTEPcJuZi93bOqQD4Spzr4+YfqnxJZVnUPsw@mail.gmail.com>
Date: Sun, 8 Jun 2025 23:25:53 -0500
From: Aaron Kling <webgeek1234@...il.com>
To: webgeek1234@...il.com
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Thierry Reding <thierry.reding@...il.com>, 
	Jonathan Hunter <jonathanh@...dia.com>, devicetree@...r.kernel.org, 
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 0/2] arm64: tegra: Add NVIDIA Jetson Nano 2GB
 Developer Kit support

On Sun, Jun 8, 2025 at 11:24 PM Aaron Kling via B4 Relay
<devnull+webgeek1234.gmail.com@...nel.org> wrote:
>
> Signed-off-by: Aaron Kling <webgeek1234@...il.com>
> ---
> Aaron Kling (2):
>       dt-bindings: arm: tegra: Document Jetson Nano Devkits
>       arm64: tegra: Add NVIDIA Jetson Nano 2GB Developer Kit support
>
>  Documentation/devicetree/bindings/arm/tegra.yaml   |  5 +++
>  arch/arm64/boot/dts/nvidia/Makefile                |  2 +
>  arch/arm64/boot/dts/nvidia/tegra210-p3541-0000.dts | 43 ++++++++++++++++++++++
>  3 files changed, 50 insertions(+)
> ---
> base-commit: 19272b37aa4f83ca52bdf9c16d5d81bdd1354494
> change-id: 20250513-p3452-059708ca9993
>
> Best regards,
> --
> Aaron Kling <webgeek1234@...il.com>

This is sent as an RFC, because it doesn't fully work. In my tests,
this boots and everything I can see works, except for hdmi. The
hotplug detect pin never changes, regardless of hdmi plug state. This
works as expected on the downstream 4.9 kernel. Based on the
downstream kernel dt for p3541, it's almost identical to p3540, and
I've mirrored those differences in this series. Things like the hpd
pin are the same. I'm failing to see why hpd would work on p3450, but
not on p3541, when using the same boot stack. Does anyone know why
this doesn't work?

Sincerely,
Aaron Kling