linux-kernel - Re: [PATCH 1/4] regulator: core: If consumers don't call regulator_set

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Message-ID: <20180815111318.GY2414@sirena.org.uk>
Date:   Wed, 15 Aug 2018 12:13:18 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     David Collins <collinsd@...eaurora.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] regulator: core: If consumers don't call
 regulator_set_load() assume max

On Tue, Aug 14, 2018 at 04:56:42PM -0700, Doug Anderson wrote:

> IMO about the best we could hope to do would be to map "mode" from
> children to parent.  AKA: perhaps you could assume that if a child is
> in a higher power mode that perhaps a parent should be too?

That's not going to work well - different regulators have wildly
different abilities to deliver current which is the whole reason why
modes are so fuzzy and hard to use in the first place.  A high power
load for a low noise regulator designed to feed analogue circuits might
not even make it out of the lowest power LDO mode of a DCDC designed to
supply the main application processors in the system or (more
relevantly) provide the main step down for a bunch of LDOs.

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