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Message-ID: <cf3a2def-4c41-4ca9-abdc-477d79ca396a@linaro.org>
Date: Wed, 21 Feb 2024 09:58:23 +0000
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Fenglin Wu <quic_fenglinw@...cinc.com>, Mark Brown <broonie@...nel.org>
Cc: andersson@...nel.org, konrad.dybcio@...aro.org, lgirdwood@...il.com,
quic_collinsd@...cinc.com, linux-arm-msm@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] regulator: qcom-rpmh: Fix pm8010 pmic5_pldo502ln minimum
voltage
On 21/02/2024 9:11 a.m., Fenglin Wu wrote:
>
> So, programming it to either 1.8V or 1.808V, the HW will output 1.8V. I
> understand there is a problem for x1e801000 because its AOP side limits
> the voltage range to [1.808V, 1.808V] for LDO3/4/6 power rails, it won't
> work if linux side updates to use 1.8V. Actually the same issue applies
> to SM8550 and SM8650 if you simply update the voltage level to 1.808V,
> because their AOP side limits the voltage ranges for some of these LDOs
> to [1.8V, 1.8V].
Hmm.
We have no use case for 1.808 to my knowledge - the sensors take
voltages in the range 1.7 to 1.9 volts.
TBH I think it should work just fine at 1.8v bang on.
I'll test this theory on the reference hardware and repost either a
patch or further discussion.
But I think we should probably just leave what you've upstreamed and
request 1.8 v in the dts honestly.
Thanks
---
bod
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