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Wed, 14 Oct 2026 07:20:15 -0700 (PDT) X-Received: by 2002:a05:6122:4659:20b0:5c9:f6b0:e5e0 with SMTP id 71dfb90a1353d-5e91f45e3edmr3486296e0c.3.1791987615096; Wed, 14 Oct 2026 07:20:15 -0700 (PDT) Received: from [192.168.226.26] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c31a9a3ae6csm713353366b.17.2026.10.14.07.20.09 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 14 Oct 2026 07:20:12 -0700 (PDT) Message-ID: <2ce49c83-b861-4a0d-8412-e8b3ff33bdd5@oss.qualcomm.com> Date: Wed, 14 Oct 2026 16:20:08 +0200 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 DNM RFC 13/16] arm64: dts: qcom: sm8650: Describe clock controller power rails To: Dmitry Baryshkov , Konrad Dybcio Cc: Stephen Boyd , Brian Masney , Jerome Brunet , Viresh Kumar , Nishanth Menon , "Rafael J. Wysocki" , Pavel Machek , Len Brown , Greg Kroah-Hartman , Danilo Krummrich , Johan Hovold , Ulf Hansson , Bjorn Andersson , Abel Vesa , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Neil Armstrong , Mike Tipton , Taniya Das , linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, driver-core@lists.linux.dev, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org References: <20261014-topic-qc_clk_dvfs-v1-0-3041b788e9f7@oss.qualcomm.com> <20261014-topic-qc_clk_dvfs-v1-13-3041b788e9f7@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=RPQmjIi+ c=1 sm=1 tr=0 ts=6acf8fa1 cx=c_pps a=+D9SDfe9YZWTjADjLiQY5g==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=eoimf2acIAo5FJnRuUoq:22 a=EUspDBNiAAAA:8 a=KR-LitqThD-uOATdN6EA:9 a=QEXdDO2ut3YA:10 a=vmgOmaN-Xu0dpDh8OwbV:22 X-Proofpoint-GUID: 4E9znjOu-pTCQAWMSR1kO3mMRPjPkpIH X-Proofpoint-ORIG-GUID: 4E9znjOu-pTCQAWMSR1kO3mMRPjPkpIH X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDE0MDA1NyBTYWx0ZWRfX6+XRB1zD7i5K tb8gizMbhkACLXDnJQvVMLdhjF4hxgLRZWKAwwyxfPdZgwNm1iVOg6I90MK3CoRH5ogVbWF0YDY 5nLiffX5igKwcZv3VREkIU9TkaguoEuNYJMcbA3hRPyw0DOQc0vCgENdbZALTfyGJ8E6fmzRY91 bXAX55HX460BEbnEvBA1lXrqBq29wVzTX6Uygj9ZoQ4nrLDCOwMDqNg8BPH0E6Y6JftPAVKTcto uP2QUC+oZcRReBZVdp+xsmQ4IqF/zqLeNhDZGRreukH730TqA+Fs5+JXzrx5mbQZNZU4J1Iuo3W 8rbhA529w1Gkf+ToGG3eNJdhfI63h3K+4ToHsQM3XQBnrlqkQlIDN6ES8I/ktc0SiHRhwglJTSR VDarVE1DMJtRePf5jlilqWRDJwrFzskabUY1rzTDDMLMjqJ3pyki03Vjxur4KPS3jevP/xBgdt2 gPUxVGmGNn8jxmY2QdA== X-Proofpoint-Spam-Info: AW1haW4tMjYxMDE0MDA1NyBTYWx0ZWRfX2F2f/ko5Z/ZV Cr+83tRzkbg6kcJeuWqacrGeo5ijx0Dg88IIkO71RCD9uo9nFqwUuIa2k8VqoA5QXaxGzMq+vKq nD4znpYMcoFF5CZZ9BhwspM1fEJsy3s= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-10-13_01,2026-10-09_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 bulkscore=0 priorityscore=1501 clxscore=1015 malwarescore=0 phishscore=0 impostorscore=0 lowpriorityscore=0 suspectscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610080000 definitions=main-2610140057 On 10/14/26 4:19 PM, Dmitry Baryshkov wrote: > On Wed, Oct 14, 2026 at 02:19:13PM +0200, Konrad Dybcio wrote: >> From: Konrad Dybcio >> >> The SM8650 clock-controller nodes omit rails needed by their clocks and >> PLLs. Without those connections, the clock-owned DVFS implementation >> cannot attach its voters to all required domains and controller probe >> can fail before any clocks are registered. >> >> Fixes: d2350377997f ("arm64: dts: qcom: add initial SM8650 dtsi") >> Assisted-by: LLM >> Signed-off-by: Konrad Dybcio >> --- >> arch/arm64/boot/dts/qcom/sm8650.dtsi | 16 +++++++++++----- >> 1 file changed, 11 insertions(+), 5 deletions(-) >> >> @@ -6049,8 +6055,8 @@ dispcc: clock-controller@af00000 { >> <0>, /* dp3 */ >> <0>; >> >> - power-domains = <&rpmhpd RPMHPD_MMCX>; >> - required-opps = <&rpmhpd_opp_low_svs>; > > I think this is neccessary (at least on some platforms) to keep MMCX out > of retention. Even if we can drop it here, I don't think we can drop it > for older platforms. MMCX exists precisely to let you turn it off, the clock patches retain a way to keep the clock on during the runtime-resume of the clock controller driver Konrad