linux-kernel - Re: [PATCH 3/3] gpio: syscon: Add support for the Xylon LogiCVC GPIOs

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Date:   Thu, 12 Sep 2019 10:17:15 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     "open list:GPIO SUBSYSTEM" <linux-gpio@...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>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 3/3] gpio: syscon: Add support for the Xylon LogiCVC GPIOs

On Tue, Sep 10, 2019 at 4:29 PM Paul Kocialkowski
<paul.kocialkowski@...tlin.com> wrote:

> The LogiCVC display hardware block comes with GPIO capabilities
> that must be exposed separately from the main driver (as GPIOs) for
> use with regulators and panels. A syscon is used to share the same
> regmap across the two drivers.
>
> Since the GPIO capabilities are pretty simple, add them to the syscon
> GPIO driver.
>
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>

I'm fine with this for now, but the gpio-syscon driver is now growing
big and when you use it you are getting support for a whole bunch
of systems you're not running on included in your binary.

We need to think about possibly creating drivers/gpio/syscon
and split subdrivers into separate files and config options
so that people can slim down to what they actually need.

> +       *bit = 1 << offset;

Please do this:

#include <linux/bits.h>

*bit = BIT(offset);

Yours,
Linus Walleij