linux-kernel - Re: [PATCH 0/3] Initial thermal management for Lichee Pi 4A board

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Message-ID: <aKEW99MyMU58GCwb@x1>
Date: Sat, 16 Aug 2025 16:40:39 -0700
From: Drew Fustini <fustini@...nel.org>
To: Icenowy Zheng <uwu@...nowy.me>
Cc: Guo Ren <guoren@...nel.org>, Fu Wei <wefu@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Han Gao <rabenda.cn@...il.com>,
	Yao Zi <ziyao@...root.org>, linux-riscv@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] Initial thermal management for Lichee Pi 4A board

On Sat, Aug 16, 2025 at 05:32:06PM +0800, Icenowy Zheng wrote:
> The SoM+Dock design of Lichee Pi 4A is quite bad at dissipating heat, so
> active cooling is quite important for it.
> 
> This patchset tries to do some initial active cooling for it, by
> utilizing software PWM to drive the fan.
> 
> Ths 1st patch adds PVT temperature coefficients, as seen in the SoC
> manual and BSP 6.6 kernel device trees.
> 
> The 2nd patch adds thermal zone information for the 2 thermal sensors in
> the PVT block.
> 
> The 3rd patch adds soft PWM + PWM fan, and makes the fan an active
> cooling device of the CPU thermal zone. 
> 
> Icenowy Zheng (3):
>   riscv: dts: thead: th1520: add coefficients to the PVT node
>   riscv: dts: thead: th1520: add initial thermal zones
>   riscv: dts: thead: th1520: add soft PWM fan for Lichee Pi 4A
> 
>  .../boot/dts/thead/th1520-lichee-pi-4a.dts    | 53 +++++++++++++++++++
>  arch/riscv/boot/dts/thead/th1520.dtsi         | 29 ++++++++++
>  2 files changed, 82 insertions(+)
> 
> -- 
> 2.50.1
> 

I just tested this on top of:
[PATCH v3 0/4] clk: thead: Changes to TH1520 clock driver for disp
[PATCH v2 0/2] clk: thead: th1520-ap: allow gate cascade and fix padctrl0

The fan is spinning when system boots at expected. That is nice that
GPIO can be used until the PWM controller driver is ready. hwmon0 shows
both temp inputs holding steady at 43.3 C and 44.4 C.

Thanks,
Drew