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

[Geert Uytterhoeven]

Hi Benjamin,

On Tue, Apr 25, 2017 at 9:07 AM, Benjamin Henrion <zoobab@xxxxxxxxx> wrote:
> On Mon, Apr 24, 2017 at 3:47 PM, Linus Walleij <linus.walleij@xxxxxxxxxx> wrote:
>> On Thu, Apr 13, 2017 at 12:27 PM, Nandor Han <nandor.han@xxxxxx> 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@xxxxxx>
>>> Signed-off-by: Semi Malinen <semi.malinen@xxxxxx>
>>
>> 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.

https://github.com/brgl/libgpiod

A bit early to expect it to be shipped with all distros, though.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds