linux-kernel - Re: [PATCH v2 3/5] regulator: da9062: add voltage selection gpio support

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Message-ID: <CACRpkdbw_R2Lu1G8ZqV8vMCQL+A7XUV7qAb=gC-je6dzPC2rzw@mail.gmail.com>
Date:   Fri, 29 Nov 2019 09:29:16 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Marco Felsch <m.felsch@...gutronix.de>
Cc:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Support Opensource <support.opensource@...semi.com>,
        Lee Jones <lee.jones@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, stwiss.opensource@...semi.com,
        Adam Thomson <Adam.Thomson.Opensource@...semi.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Sascha Hauer <kernel@...gutronix.de>
Subject: Re: [PATCH v2 3/5] regulator: da9062: add voltage selection gpio support

On Wed, Nov 27, 2019 at 2:59 PM Marco Felsch <m.felsch@...gutronix.de> wrote:

> The DA9062/1 devices can switch their regulator voltages between
> voltage-A (active) and voltage-B (suspend) settings. Switching the
> voltages can be controlled by ther internal state-machine or by a gpio
> input signal and can be configured for each individual regulator. This
> commit adds the gpio-based voltage switching support.
>
> Signed-off-by: Marco Felsch <m.felsch@...gutronix.de>
> ---
> Changelog:
>
> v2:
> - use new public api gpiod_to_offset()

OK this is better in my opinion, at least it is a lesser evil than
the hacks I've seen.

> +       struct reg_field vsel_gpi;

Again add some comments to the code describing what this is
about please. A general purpose input that can be configured
such that it is not a general purpose input anymore, but instead
looped back internally to control a voltage on the DA9062.

Part of me wonder if these lines are really "general purpose"
but I suppose software could use them.

Yours,
Linus Walleij