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Message-ID: <3fa57258-96ac-431d-ac3f-1c5de8295f82@sirena.org.uk>
Date: Tue, 27 Jan 2026 17:50:31 +0000
From: Mark Brown <broonie@...nel.org>
To: Saikiran B <bjsaikiran@...il.com>
Cc: lgirdwood@...il.com, andersson@...nel.org, konrad.dybcio@...aro.org,
linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] regulator: qcom-rpmh: Add support for
regulator-off-on-delay-us
On Tue, Jan 27, 2026 at 11:13:45PM +0530, Saikiran B wrote:
> > What exactly are we talking about in terms of the actual configuration here...
> These are LDOs (LDO1, LDO3 and LDO7) powering camera sensors on the
> Lenovo Yoga Slim 7x.
> The issue is platform-specific: this board has large bulk capacitors
> on the camera rails. When the LDO is disabled, the voltage decays very
> slowly (passive discharge), taking some time (Still testing various
> timings) to reach a safe reset level. If we re-enable the rail before
> this discharge completes, the sensor experiences a brownout and fails
> to initialize.
OK, that makes sense - please include this description in the commit
log.
> > This would at a minimum need the bindings for the regulators on the affected platforms to be updated.
> Understood. I missed the binding update. I will prepare a patch to
> update Documentation/devicetree/bindings/regulator/qcom,rpmh-regulator.yaml
> to allow this property.
Great, sounds good.
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