linux-kernel - Re: [RFC PATCH v3 14/15] gpio: Add definition for GPIO direction

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Date:   Sun, 3 Nov 2019 23:30:10 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Cc:     Matti Vaittinen <mazziesaccount@...il.com>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Lee Jones <lee.jones@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Linux LED Subsystem <linux-leds@...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>,
        linux-clk <linux-clk@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-rtc@...r.kernel.org
Subject: Re: [RFC PATCH v3 14/15] gpio: Add definition for GPIO direction

Hi Matti!

Good initiative (and I will see a ton of janitorial patches as a
result of this...)

On Fri, Nov 1, 2019 at 12:50 PM Matti Vaittinen
<matti.vaittinen@...rohmeurope.com> wrote:

> At least for me it is difficult to remember the meaning of GPIO
> direction values. Define GPIO_IN and GPIO_OUT so that occasional
> GPIO contributors would not need to always check the meaning of
> hard coded values 1 and 0.
>
> Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
(...)
> +#define GPIO_IN                1
> +#define GPIO_OUT       0

Please spell it out or people will be confused:

GPIO_LINE_DIRECTION_IN
GPIO_LINE_DIRECTION_OUT

Yours,
Linus Walleij