linux-kernel - Re: [PATCH V2 4/6] regulator: qcom_smd: Add support to define the bootup voltage

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Date:   Mon, 3 Apr 2023 19:28:17 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     Devi Priya <quic_devipriy@...cinc.com>, agross@...nel.org,
        andersson@...nel.org, lgirdwood@...il.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        quic_srichara@...cinc.com, quic_gokulsri@...cinc.com,
        quic_sjaganat@...cinc.com, quic_kathirav@...cinc.com,
        quic_arajkuma@...cinc.com, quic_anusha@...cinc.com,
        quic_ipkumar@...cinc.com
Subject: Re: [PATCH V2 4/6] regulator: qcom_smd: Add support to define the
 bootup voltage

On Mon, Apr 03, 2023 at 08:21:25PM +0200, Konrad Dybcio wrote:
> On 3.04.2023 20:14, Mark Brown wrote:

> > than up to the minimum.  The driver could also look at the constraints
> > when guessing at the hardware configuration rather than claiming an out
> > of spec voltage, this would mean we wouldn't need to correct anything.

> Hm, all of what you said sounds like a valid concern.. And then we
> probably shouldn't shoot up to max by default, as going too low is
> not going to cause as much potential irreversible damage as going
> too high.. Especially with programmer error..

It sounds like the driver should just be reporting a value which is at
least within the constraints.

> Too bad Qualcomm's firmware architecture doesn't allow for reading
> back the voltage..

Right, their interfaces here have some serious drawbacks.

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