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Thu, 01 Oct 2026 05:46:57 -0700 (PDT) X-Received: by 2002:a17:90b:50c5:b0:3a0:c717:2db with SMTP id 98e67ed59e1d1-3a4d1534cb9mr1845973a91.27.1790858817203; Thu, 01 Oct 2026 05:46:57 -0700 (PDT) Received: from [10.213.109.130] ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3a4f479dc9fsm4567467a91.15.2026.10.01.05.46.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 01 Oct 2026 05:46:55 -0700 (PDT) From: Jishnu Prakash Date: Thu, 01 Oct 2026 18:16:29 +0530 Subject: [PATCH v4 2/4] regulator: qcom-rpmh: Add support for regulator-off-on-delay-us Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261001-regulator-off-on-delay-v4-2-258ba9612da8@oss.qualcomm.com> References: <20261001-regulator-off-on-delay-v4-0-258ba9612da8@oss.qualcomm.com> In-Reply-To: <20261001-regulator-off-on-delay-v4-0-258ba9612da8@oss.qualcomm.com> To: Liam Girdwood , Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org, Manivannan Sadhasivam , Kamal Wadhwa , Saikiran , Jishnu Prakash X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; 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The issue is platform-specific: The Lenovo Yoga Slim 7x (Snapdragon X Elite) has large bulk capacitors on the camera rails (LDO1, LDO3, LDO7). When these regulators are disabled, the voltage decays very slowly (passive discharge). If the rail is re-enabled before this discharge completes, the sensor experiences a brownout and fails to initialize. Add support for parsing the 'regulator-off-on-delay-us' property from the device tree to enforce this physical constraint. Signed-off-by: Saikiran Signed-off-by: Jishnu Prakash --- drivers/regulator/qcom-rpmh-regulator.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/regulator/qcom-rpmh-regulator.c b/drivers/regulator/qcom-rpmh-regulator.c index 25c14de3cd8b..4773034b5d42 100644 --- a/drivers/regulator/qcom-rpmh-regulator.c +++ b/drivers/regulator/qcom-rpmh-regulator.c @@ -552,6 +552,9 @@ static int rpmh_regulator_init_vreg(struct rpmh_vreg *vreg, struct device *dev, vreg->always_wait_for_ack = of_property_read_bool(node, "qcom,always-wait-for-ack"); + of_property_read_u32(node, "regulator-off-on-delay-us", + &vreg->rdesc.off_on_delay); + vreg->rdesc.owner = THIS_MODULE; vreg->rdesc.type = REGULATOR_VOLTAGE; vreg->rdesc.ops = vreg->hw_data->ops; -- 2.43.0