linux-kernel - Re: [PATCH] regulator: anatop: Drop min dropout for bypass mode

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Date:   Tue, 3 Mar 2020 17:10:49 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Anson Huang <Anson.Huang@....com>
Cc:     lgirdwood@...il.com, linux-kernel@...r.kernel.org,
        Linux-imx@....com
Subject: Re: [PATCH] regulator: anatop: Drop min dropout for bypass mode

On Tue, Mar 03, 2020 at 10:24:36PM +0800, Anson Huang wrote:
> Some of anatop regulators support bypass mode, and in bypass mode,
> minimum dropout is NOT required, the input voltage will be equal to
> the output voltage. The minimum dropout value is ONLY necessary for
> LDO enabled mode, so drop the minimum dropout for bypass mode to
> avoid unexpected high voltage output from PMIC supplies.

The goal makes sense but I don't think it makes sense to do this in the
driver - changing this without the core knowing is likely to lead to
confusion at some point and also I think this behaviour is likely to be
the same for every regulator that has a bypass mode (at least if it
isn't I'm kind of confused about how it's bypassing, usually the minimum
drop is a function of maintaining regulation).  Could you look into
doing something like this in the core instead please?

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