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Tue, 27 Jan 2026 11:02:27 -0800 (PST) From: Saikiran To: broonie@kernel.org, lgirdwood@gmail.com Cc: andersson@kernel.org, konrad.dybcio@kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, robh@kernel.org, krzk+dt@kernel.org, devicetree@vger.kernel.org, Saikiran Subject: [PATCH v3 2/2] regulator: qcom-rpmh: Add support for regulator-off-on-delay-us Date: Wed, 28 Jan 2026 00:32:11 +0530 Message-ID: <20260127190211.14312-3-bjsaikiran@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260127190211.14312-1-bjsaikiran@gmail.com> References: <20260127190211.14312-1-bjsaikiran@gmail.com> Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The core regulator framework supports enforcing a physical off-time via standard properties, but the `qcom-rpmh-regulator` driver currently ignores them. 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 --- 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 6e4cb2871fca..aafba61551b3 100644 --- a/drivers/regulator/qcom-rpmh-regulator.c +++ b/drivers/regulator/qcom-rpmh-regulator.c @@ -503,6 +503,9 @@ 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; -- 2.51.0