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

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Date:   Mon, 24 Apr 2017 13:53:15 +0000
From:   "Han, Nandor (GE Healthcare)" <nandor.han@...com>
To:     Linus Walleij <linus.walleij@...aro.org>
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>,
        "Malinen, Semi (GE Healthcare)" <semi.malinen@...com>
Subject: [PATCH v2 2/4] gpio - Add EXAR XRA1403 SPI GPIO expander driver



> -----Original Message-----
> From: Linus Walleij [mailto:linus.walleij@...aro.org]
> Sent: 24 April 2017 16:47
> To: Han, Nandor (GE Healthcare) <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; devicetree@...r.kernel.org; linux-kernel@...r.kernel.org; Malinen, Semi (GE Healthcare)
> <semi.malinen@...com>
> Subject: EXT: 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.
> 

Ahh.. I forgot to change this commit message. Sorry I will change it ASAP.

> 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.
> 

I've noticed that. I will change it in the next rev.

> Yours,
> Linus Walleij

Thanks,
   Nandy