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Date:   Fri, 21 Feb 2020 14:49:21 +0100
From:   Linus Walleij <>
To:     Matti Vaittinen <>
Cc:     Matti Vaittinen <>,,,
        Mark Brown <>,
        Sebastian Reichel <>,
        Rob Herring <>,
        Mark Rutland <>,
        Linux PM list <>,
        "" <>
Subject: Re: [RFC PATCH v2 3/5] power: Add linear_range helper

On Fri, Feb 14, 2020 at 8:37 AM Matti Vaittinen
<> 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 <>
> ---
> Where should we put these?

This works.

Reviewed-by: Linus Walleij <>

Linus Walleij

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