linux-kernel - Re: [RFC PATCH 2/3] power: (regmap:) Add linear

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Date:   Tue, 11 Feb 2020 19:06:14 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Cc:     mazziesaccount@...il.com, mikko.mutanen@...rohmeurope.com,
        markus.laine@...rohmeurope.com,
        Linus Walleij <linus.walleij@...aro.org>,
        Sebastian Reichel <sre@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/3] power: (regmap:) Add linear_range helper

On Mon, Feb 10, 2020 at 02:13:13PM +0200, Matti Vaittinen wrote:

> Provide a linear_range helper which can do conversion from user value
> to register value 'selector'.

> Mark, this is loosely bound to register handling... Do you think
> the regmap could host these helpers?

There's no real tie to regmap here, something like this could quite
happily be used by memory mapped devices where regmap has limited uses
and would be a lot to pull in.  A separate library would probably make
more sense.  Not sure how many users there would be outside of power
related stuff, I don't recall seeing the pattern elsewhere.

Note also that we already have quite extensive helpers for this sort of
stuff in the regulator API which I sense may have been involved in this
implementation and to an extent in ALSA which takes a different approach
with TLVs since it baked selectors directly into the ABI.

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