linux-kernel - Re: [PATCH v2 2/4] gpio - Add EXAR XRA1403 SPI GPIO expander driver

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Date:   Tue, 25 Apr 2017 09:07:06 +0200
From:   Benjamin Henrion <zoobab@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Nandor Han <nandor.han@...com>,
        Greg KH <gregkh@...uxfoundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Alexandre Courbot <gnurou@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Semi Malinen <semi.malinen@...com>
Subject: Re: [PATCH v2 2/4] gpio - Add EXAR XRA1403 SPI GPIO expander driver

On Mon, Apr 24, 2017 at 3:47 PM, Linus Walleij <linus.walleij@...aro.org> wrote:
> On Thu, Apr 13, 2017 at 12:27 PM, Nandor Han <nandor.han@...com> wrote:
>
>> This is a simple driver that provides a /sys/class/gpio
>> interface for controlling and configuring the GPIO lines.
>> It does not provide support for chip select or interrupts.
>>
>> Signed-off-by: Nandor Han <nandor.han@...com>
>> Signed-off-by: Semi Malinen <semi.malinen@...com>
>
> I almost want to make the driver depend on !GPIO_SYSFS because
> of this commit message.
>
> DO NOT USE OR ENCOURAGE THE USE OF THE GPIO SYSFS
> INTERFACE.
>
> Use the character device.

I doubt you will be able to convince the majority of people toggling
GPIOs via a simple shell script to switch to write a complex C
program. Not to mention cross compilation and the libraries
dependencies here.

Is there some good cli tools to access the new char device? If they
are shipped with most distros, that would reduce the pain.

Best,

--
Benjamin Henrion <bhenrion at ffii.org>
FFII Brussels - +32-484-566109 - +32-2-3500762
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