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Date:   Fri, 21 Feb 2020 14:49:21 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Cc:     Matti Vaittinen <mazziesaccount@...il.com>,
        mikko.mutanen@...rohmeurope.com, markus.laine@...rohmeurope.com,
        Mark Brown <broonie@...nel.org>,
        Sebastian Reichel <sre@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Linux PM list <linux-pm@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v2 3/5] power: Add linear_range helper

On Fri, Feb 14, 2020 at 8:37 AM Matti Vaittinen
<matti.vaittinen@...rohmeurope.com> wrote:

> Many devices have control registers which control some measurable
> property. Often a register contains control field so that change in
> this field causes linear change in the controlled property. It is not
> a rare case that user wants to give 'meaningfull' control values and
> driver needs to convert them to register field values. Even more
> often user wants to 'see' the currently set value - again in
> meaningfull units - and driver needs to convert the values it reads
> from register to these meaningfull units.

Rename meaningfull -> meaningful

> This ideas is stol... borrowed from regulator framework's
> regulator_linear_ranges handling.

Hehe maybe one day we can move the whole thing to lib/
but let's take one step at a time.

> Provide a linear_range helper which can do conversion from user value
> to register value 'selector'.
>
> Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
> ---
>
> Where should we put these?

This works.

Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij

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