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

[Linus Walleij]

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.

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