linux-kernel - Re: [PATCH v3 1/7] gpiolib: Add GPIOCHIP

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Message-ID: <20191202211737.GA27915@vmlxhi-102.adit-jv.com>
Date:   Mon, 2 Dec 2019 22:17:37 +0100
From:   Eugeniu Rosca <erosca@...adit-jv.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
CC:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Jonathan Corbet <corbet@....net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Harish Jenny K N <harish_kandiga@...tor.com>,
        Eugeniu Rosca <erosca@...adit-jv.com>,
        Alexander Graf <graf@...zon.com>,
        Peter Maydell <peter.maydell@...aro.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Phil Reid <preid@...ctromag.com.au>,
        Marc Zyngier <marc.zyngier@....com>,
        Christoffer Dall <christoffer.dall@....com>,
        Magnus Damm <magnus.damm@...il.com>,
        <linux-gpio@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-renesas-soc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <qemu-devel@...gnu.org>,
        Eugeniu Rosca <roscaeugeniu@...il.com>
Subject: Re: [PATCH v3 1/7] gpiolib: Add GPIOCHIP_NAME definition

Hi Geert,

On Wed, Nov 27, 2019 at 09:42:47AM +0100, Geert Uytterhoeven wrote:
> The string literal "gpiochip" is used in several places.
> Add a definition for it, and use it everywhere, to make sure everything
> stays in sync.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
> v3:
>   - New.
> ---
>  drivers/gpio/gpiolib-sysfs.c | 7 +++----
>  drivers/gpio/gpiolib.c       | 4 ++--
>  drivers/gpio/gpiolib.h       | 2 ++
>  3 files changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
> index ca9bc1e4803c2979..a4a759920faa48ab 100644
> --- a/drivers/gpio/gpiolib.h
> +++ b/drivers/gpio/gpiolib.h
> @@ -16,6 +16,8 @@
>  #include <linux/module.h>
>  #include <linux/cdev.h>
>  
> +#define GPIOCHIP_NAME	"gpiochip"

[.02$/nit] I wonder if GPIOCHIP_NAME is actually an essential
part of kernel-user contract [1-2], in which case it could
probably be moved to include/uapi/linux/gpio.h ?

Regardless:
Reviewed-by: Eugeniu Rosca <erosca@...adit-jv.com>

[1] linux (v5.4) git grep '"gpiochip' -- tools/
tools/gpio/lsgpio.c:                    if (check_prefix(ent->d_name, "gpiochip")) {
tools/testing/selftests/gpio/gpio-mockup-chardev.c:             if (check_prefix(ent->d_name, "gpiochip")) {

[2] libgpiod (v1.4-76-g00418dfdfc8b) git grep '"gpiochip'
lib/iter.c:	return !strncmp(dir->d_name, "gpiochip", 8);
tests/mockup/gpio-mockup.c:	rv = sscanf(sysname, "gpiochip%u", &chip->num);
tools/gpioget.c:		die("gpiochip must be specified");
tools/gpiomon.c:		die("gpiochip must be specified");
tools/gpioset.c:		die("gpiochip must be specified");

-- 
Best Regards,
Eugeniu