linux-kernel - Re: [PATCH] arm64: dts: qcom: x1e80100: Add '#cooling-cells' for CPU nodes

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Message-ID: <isjyk3ngoyzzhf3c7edntb23n3smh2uazgeyhwqnzjvdnafzmq@42x35y3emgkv>
Date: Thu, 18 Dec 2025 15:40:44 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>,
        Manivannan Sadhasivam <mani@...nel.org>, andersson@...nel.org,
        konradybcio@...nel.org, robh@...nel.org, krzk+dt@...nel.org,
        conor+dt@...nel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: x1e80100: Add '#cooling-cells' for CPU
 nodes

On Thu, Dec 18, 2025 at 01:54:30PM +0100, Konrad Dybcio wrote:
> On 12/8/25 6:13 AM, Manivannan Sadhasivam wrote:
> > On Sun, Oct 19, 2025 at 07:01:30PM +0300, Dmitry Baryshkov wrote:
> >> On Wed, Oct 15, 2025 at 12:27:03PM +0530, Manivannan Sadhasivam wrote:
> >>> From: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
> >>>
> >>> Enable passive cooling for CPUs in the X1E80100 SoC by adding the
> >>> '#cooling-cells' property. This will allow the OS to mitigate the CPU
> >>> power dissipation with the help of SCMI DVFS.
> >>
> >> #cooling-cells isn't enough, the devices need to be listed in the
> >> thermal maps.
> >>
> > 
> > Not strictly required unless the cooling device and trip points are wired in DT.
> > But I don't want to do that yet, and just expose the cooling devices to
> > userspace so that I can experiment with something like thermal-daemon.
> 
> Rob, Krzysztof,
> 
> Would it be an overly ambitious idea to make #cooling-cells required for
> CPU nodes? I'd imagine some sort of cpuidle or cpufreq is desired on almost
> all platforms, which could be used as a cooling/throttling measure..

Looking at my museum, i.MX devices don't have #cooling-cells before
i.MX6.

-- 
With best wishes
Dmitry