linux-kernel - Re: [PATCH] arm64: dts: rockchip: pwm-fan overlay for NanoPC-T6

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Message-ID: <CABjd4YxsfxwEbic8QEabX1h9j0B3DBw9LWwctJx7SzdvXZdDhA@mail.gmail.com>
Date: Mon, 27 Oct 2025 13:14:28 +0400
From: Alexey Charkov <alchark@...il.com>
To: Hugh Cole-Baker <sigmaris@...il.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>, devicetree@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: rockchip: pwm-fan overlay for NanoPC-T6

Hi Hugh,

On Mon, Oct 27, 2025 at 1:09 PM Hugh Cole-Baker <sigmaris@...il.com> wrote:
>
> FriendlyELEC offers an optional heatsink and fan addon for the NanoPC-T6
> and T6 LTS. Add an overlay which can be applied if the fan is fitted and
> configures the fan as an active cooling device for the SoC package.
>
> Signed-off-by: Hugh Cole-Baker <sigmaris@...il.com>
> ---
> FriendlyELEC heatsink with fan addon:
> https://www.friendlyelec.com/index.php?route=product/product&product_id=305
> Vendor DT with trip points and PWM duty cycle values:
> https://github.com/friendlyarm/kernel-rockchip/blob/4944602540b62f5aad139fe602a76cf7c3176128/arch/arm64/boot/dts/rockchip/rk3588-nanopi6-rev01.dts#L75-L90

Is there any downside to enabling this unconditionally in the board
.dts? Overlays require more user configuration, and not all
bootloaders support them directly (e.g. systemd-boot users would
struggle). Compiling with overlays enabled also makes .dtb's a lot
larger due to added symbols information.

Best regards,
Alexey