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

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Date:   Mon, 24 Apr 2017 15:47:10 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Nandor Han <nandor.han@...com>
Cc:     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 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.

Use the example in tools/gpio/* as a guideline and testbed.

Use libgpiod as a rich userspace.

And the commit message should state that this is a driver
for such and such Exar hardware instead.

Thanks.

> +#include <linux/bitops.h>
> +#include <linux/gpio/driver.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of_device.h>
> +#include <linux/of_gpio.h>
> +#include <linux/spi/spi.h>
> +#include <linux/regmap.h>

You are missing
#include <linux/seq_file.h>

and that is why the build robot is complaining.

Yours,
Linus Walleij