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([2a05:6e02:1041:c10:ae20:597c:99b8:d161]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43b64703343sm12446577f8f.19.2026.03.21.02.00.07 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 21 Mar 2026 02:00:08 -0700 (PDT) Message-ID: <909009ab-53fe-4b20-ad2c-bc8eac9e8bc1@oss.qualcomm.com> Date: Sat, 21 Mar 2026 10:00:07 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/8] dt-bindings: thermal: Add qcom,qmi-cooling yaml bindings To: Konrad Dybcio , Gaurav Kohli , Krzysztof Kozlowski Cc: andersson@kernel.org, mathieu.poirier@linaro.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, rui.zhang@intel.com, lukasz.luba@arm.com, konradybcio@kernel.org, mani@kernel.org, casey.connolly@linaro.org, amit.kucheria@oss.qualcomm.com, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, manaf.pallikunhi@oss.qualcomm.com References: <20260127155722.2797783-3-gaurav.kohli@oss.qualcomm.com> <20260128-whispering-caracal-of-respect-a26638@quoll> <36706481-2549-4716-8e6d-0e4db42591a2@oss.qualcomm.com> <546faeda-d896-403c-a449-5c9b0cd7159e@kernel.org> <17474333-bb82-49d7-bc04-45ab21095c38@oss.qualcomm.com> <4f815a0f-a815-4b77-a4cf-a4b18e776eab@oss.qualcomm.com> <95142608-b5b1-43a4-b8b6-38e658275f30@kernel.org> <3922012f-25e6-4b75-9183-f9277ef5d040@oss.qualcomm.com> <74f59ef0-ead7-483f-a80e-a3da2f6ebcdb@oss.qualcomm.com> Content-Language: en-US From: Daniel Lezcano In-Reply-To: <74f59ef0-ead7-483f-a80e-a3da2f6ebcdb@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Proofpoint-GUID: zIbQbBCSl-D4Y2Yr93NzdZ7E-jDh82Sy X-Authority-Analysis: v=2.4 cv=Z5rh3XRA c=1 sm=1 tr=0 ts=69be5e1a cx=c_pps a=WeENfcodrlLV9YRTxbY/uA==:117 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_K5XuSEh1TEqbUxoQ0s3:22 a=FQBcWiJ5rebsmBwV6QgA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=kacYvNCVWA4VmyqE58fU:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzIxMDA3MiBTYWx0ZWRfX93kk99xkOfyq 8pPIHEVQ6gT4KiHx3TAB5YfW+bTFAkOJl5xZ3C9gpp06J+2rgV/VggJfuESxsKIpZbtHi3Adh4Z auksqQ0X782jqqo/XMHW7CrW6ccJdSM9t7JB9O/e4m81MNv9NmmY1JpU9FzDvZETPTPkP3GzLbW ydEnvLy5hMVCKuqJIqrPnrdQo+krCMxB3dBdoR/f7KHYNqPLEID6GUQYsx/sh69ZieRFgKGxCDu S5vAGU5tYXEcyxY/7JKQrTZ9IGlUtaFq6xaVjKPgFuQGS4SzshLxaS4fqPfEYG4k9I5so8FQXcX +pikKt9S3/HBvK9lGsmnZxq0j9kwQxokuMgVAKSZZFYpxZwjdTZAJtqnBll9Z1VwFK2lgRtYLnR RRgIFfyBhfB9fnUabduJYwcs3a0Q46Yqha/lwV25SNUmpNtFLE1VOe/nbsod/JAOlFRaGCozcwV Cz+xi4XwfpViYGI0WjA== X-Proofpoint-ORIG-GUID: zIbQbBCSl-D4Y2Yr93NzdZ7E-jDh82Sy X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-21_03,2026-03-20_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 bulkscore=0 suspectscore=0 clxscore=1015 spamscore=0 impostorscore=0 adultscore=0 phishscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603210072 Hi Konrad, On 3/19/26 10:51, Konrad Dybcio wrote: > On 3/18/26 11:17 AM, Gaurav Kohli wrote: >> >> >> On 3/17/2026 1:27 AM, Daniel Lezcano wrote: >>> On Tue, Feb 24, 2026 at 01:17:22PM +0100, Krzysztof Kozlowski wrote: >>>> On 24/02/2026 13:09, Gaurav Kohli wrote: >>> >>> [ ... ] >>> >>>>>>> As a result, each core requires its own cooling device, which must be >>>>>>> linked to its TSENS thermal zone. Because of this, we introduced >>>>>>> multiple child nodes—one for each cooling device. >>>>>> >>>>>> So you have one device with cooling cells=1+2, no? >>>>>> >>>>> >>>>> This will be a bigger framework change which is not supported, i can see >>>> >>>> I don't think that changing open source frameworks is "not supported". I >>>> am pretty sure that changing is not only supported, but actually desired. >>> >>> Yes, IMO it could make sense. There are the thermal zones with phandle >>> to a sensor and a sensor id. We can have the same with a phandle to a >>> cooling device and a cooling device id. >>> >>> (... or several ids because the thermal sensor can also have multiple >>> ids ?) >>> >>> May be an array of names corresponding to the TMD names at the 'id' >>> position ? >>> >> >> I am using dt node like below to use with cooling-cells = <3> approach, will post new patches with that. >> >> cdsp_tmd: cdsp-tmd { >>     compatible = "qcom,qmi-cooling-cdsp"; >>     tmd-names = "cdsp_sw", "cdsp_hw"; >>     #cooling-cells = <3>; >> }; >> >> please let me know, if you are expecting something like this only. > > My question about the need of a separate node still remains, i.e. > why can't this be: > > remoteproc_cdsp: remoteproc@cafebabe { > compatible = "qcom,foo-cdsp" > > ... > > tmd-names = "abc", "xyz"; > #cooling-cells = <3>; > }; > > > > foo-thermal { > cooling-maps { > map0 { > cooling-device = <&remoteproc_cdsp CDSP_COOLING_XYZ > THERMAL_NO_LIMIT THERMAL_NO_LIMIT>; > }; > }; > }; > > where you'd presumably call something like qmi_cooling_register(...) from > the remoteproc driver, making your added code essentially a library, not a > separate platform device I'm not sure to get your question. My understanding of the 3 cooling-cells is exactly what you described. The second argument of the cooling-device map is an index corresponding to the id of the TMD. BTW I prefer also the compatible name like 'qcom,foo-cdsp'