linux-kernel - Re: [PATCH v2 5/8] arm64: dts: qcom: lemans: Enable CDSP cooling

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Message-ID: <stmlthovu36kyhhnn7s7rpn5l53chnvmn3lmyepzpg33o7hpo4@cnoknywqgry2>
Date: Thu, 29 Jan 2026 14:29:24 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Gaurav Kohli <gaurav.kohli@....qualcomm.com>
Cc: andersson@...nel.org, mathieu.poirier@...aro.org, robh@...nel.org,
        krzk+dt@...nel.org, conor+dt@...nel.org, rui.zhang@...el.com,
        lukasz.luba@....com, konradybcio@...nel.org, mani@...nel.org,
        casey.connolly@...aro.org, amit.kucheria@....qualcomm.com,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        manaf.pallikunhi@....qualcomm.com
Subject: Re: [PATCH v2 5/8] arm64: dts: qcom: lemans: Enable CDSP cooling

On Thu, Jan 29, 2026 at 05:40:56PM +0530, Gaurav Kohli wrote:
> 
> On 1/29/2026 6:13 AM, Dmitry Baryshkov wrote:
> > On Tue, Jan 27, 2026 at 09:27:19PM +0530, Gaurav Kohli wrote:
> > > Unlike the CPU, the CDSP does not throttle its speed automatically
> > > when it reaches high temperatures in Lemans.
> > > 
> > > Set up CDSP cooling by throttling the cdsp when it reaches 105°C.
> > > 
> > > Signed-off-by: Gaurav Kohli <gaurav.kohli@....qualcomm.com>
> > > ---
> > >   arch/arm64/boot/dts/qcom/lemans.dtsi | 138 ++++++++++++++++++++++++---
> > >   1 file changed, 126 insertions(+), 12 deletions(-)
> > > 
> > > diff --git a/arch/arm64/boot/dts/qcom/lemans.dtsi b/arch/arm64/boot/dts/qcom/lemans.dtsi
> > > index 808827b83553..c747dd534caa 100644
> > > --- a/arch/arm64/boot/dts/qcom/lemans.dtsi
> > > +++ b/arch/arm64/boot/dts/qcom/lemans.dtsi
> > > @@ -7281,6 +7281,15 @@ compute-cb@11 {
> > >   					};
> > >   				};
> > >   			};
> > > +
> > > +			cooling {
> > > +				compatible = "qcom,qmi-cooling-cdsp";
> > > +
> > > +				cdsp_tmd0: cdsp-tmd0 {
> > This question was already raised. Are there more than one cooling device
> > for the DSP? If not, drop the subnodes.
> 
> 
> Thanks Dmitry for review.
> 
> Yes, Each subsystem may support multiple thermal mitigation devices through
> remote TMD service.

May or does?

> So, need to define subnodes.
> 
> 
> > > +					label = "cdsp_sw";
> > > +					#cooling-cells = <2>;
> > > +				};
> > > +			};
> > >   		};
> > >   		nspb_noc: interconnect@...c0000 {

-- 
With best wishes
Dmitry