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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b8dbef87254sm397985666b.12.2026.01.30.03.05.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 30 Jan 2026 03:05:40 -0800 (PST) Message-ID: Date: Fri, 30 Jan 2026 12:05:38 +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 v3 1/2] dt-bindings: regulator: qcom,rpmh: Allow regulator-off-on-delay-us To: Mark Brown , Rob Herring , Jishnu Prakash , Kamal Wadhwa Cc: Saikiran , lgirdwood@gmail.com, andersson@kernel.org, konradybcio@kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, krzk+dt@kernel.org, devicetree@vger.kernel.org References: <20260127190211.14312-1-bjsaikiran@gmail.com> <20260127190211.14312-2-bjsaikiran@gmail.com> <20260129174829.GA1324020-robh@kernel.org> <355213ef-106c-4383-88e7-9b40f5b1c1ef@sirena.org.uk> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <355213ef-106c-4383-88e7-9b40f5b1c1ef@sirena.org.uk> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: QpxGBEkKLMM-V8AqZYAhZwVJhYuRxclx X-Authority-Analysis: v=2.4 cv=W541lBWk c=1 sm=1 tr=0 ts=697c9086 cx=c_pps a=oc9J++0uMp73DTRD5QyR2A==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=vUbySO9Y5rIA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=GEzcQQvqF8elpVRPfI0A:9 a=QEXdDO2ut3YA:10 a=iYH6xdkBrDN1Jqds4HTS:22 X-Proofpoint-ORIG-GUID: QpxGBEkKLMM-V8AqZYAhZwVJhYuRxclx X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTMwMDA4OSBTYWx0ZWRfX6Z3KYIgc5LU7 mSMYDe1KmsV26oOLoaeY0ReERdoAeIrT8y4vqTFAYvmTK2Mau6xepHiKOSdLUOJmR/chdZLIwuy GOneeg2NeljAqFqOfEACWZHhxjfBobBkdFa+0GdVOp12+Jht9+A9CuMp7hfuwRJJb4VbqEOiKCA ihQTgjqGgIEMlaAHmprV4yMgjCNxaL46n/yOH3tfCgqSjks8diaBHujTKEhcfCD/Q5dvqXOOfAH ai9s7JaoYs3kqydhzZmaJ/3huZtgxfBlitdUB1kWUNe0RNTEbqnopcMuwP95Bw7jo+UpepYloJh 9VItYPydmIrZNbpBjA/Zb/gLnooGyR9IeIYKEgM8yZPwuyTiq+IpHIrEC7lIwFiIjkQS4Wsg4KL fuILntESpdjDQJ+W427wkwOlnKK/MUGmXdbgFJ44M4tQ/vW5CAStnRxI8nTd9kFB+hiojAB7XlC U2qm5Ycwi5W3is9RJEg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-01-30_01,2026-01-29_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 spamscore=0 malwarescore=0 lowpriorityscore=0 priorityscore=1501 adultscore=0 clxscore=1015 impostorscore=0 phishscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2601300089 On 1/29/26 7:15 PM, Mark Brown wrote: > On Thu, Jan 29, 2026 at 11:49:42AM -0600, Rob Herring wrote: >> On Wed, Jan 28, 2026 at 12:32:10AM +0530, Saikiran wrote: > >>> This property is required for platforms where specific rails (like camera >>> LDOs) rely on passive discharge and need a mandatory off-time constraint >>> enforced by the regulator core. > >> Does enforcing some off time on all your regulators cause some negative >> impact on the ones that don't need it? If turning them back on is >> performance critical maybe don't turn them off in the first place. > > You might see something like unexpectedly long delays resuming a runtime > suspended device. Generally I'd say that if the delays needed for > something like this are long enough for anyone to notice they're long > enough to be disruptive. > > Having said that I believe an active discharge feature in the hardware > has been identified and is being investigated, that's generally a vastly > better solution all round so hopefully this change isn't needed at all. +Jishnu, Kamal Could you please confirm whether our hw can do that? Konrad