linux-kernel - Re: [v2 3/4] regulator: qcom: Add labibb driver

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Message-ID: <20200512114452.GE5110@sirena.org.uk>
Date:   Tue, 12 May 2020 12:44:52 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Sumit Semwal <sumit.semwal@...aro.org>, agross@...nel.org,
        lgirdwood@...il.com, robh+dt@...nel.org,
        nishakumari@...eaurora.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        kgunda@...eaurora.org, rnayak@...eaurora.org
Subject: Re: [v2 3/4] regulator: qcom: Add labibb driver

On Mon, May 11, 2020 at 07:15:09PM -0700, Bjorn Andersson wrote:
> On Fri 08 May 13:41 PDT 2020, Sumit Semwal wrote:

> > +	int ret;
> > +	struct labibb_regulator *reg = rdev_get_drvdata(rdev);
> > +
> > +	while (retries--) {

> Mark's suggestion of extending _regulator_enable_delay() to support
> polling is_enable() seems reasonable.

> The only complication I can see is that code path currently doesn't have
> any expectations of the regulator not being operational at the end -
> this seems to offer that possibility. So some care needs to be taken
> there.

Are we expecting that to happen in normal operation?  Generally this is
a pretty serious problem.  In any caser if we're adding checks of status
we'd need an error return if the status doesn't show the regulator is on
after some reasonable time.

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