linux-kernel - Re: [RESEND PATCH v5 3/5] IIO: Ingenic JZ47xx: Add touchscreen mode.

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Date:   Sat, 18 Apr 2020 00:42:23 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Artur Rojek <contact@...ur-rojek.eu>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jonathan Cameron <jic23@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>,
        linux-input <linux-input@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-iio <linux-iio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND PATCH v5 3/5] IIO: Ingenic JZ47xx: Add touchscreen mode.

On Sat, Apr 18, 2020 at 12:18 AM Paul Cercueil <paul@...pouillou.net> wrote:
> Le sam. 18 avril 2020 à 0:13, Andy Shevchenko
> <andy.shevchenko@...il.com> a écrit :
> > On Sat, Apr 18, 2020 at 12:05 AM Paul Cercueil <paul@...pouillou.net>
> > wrote:
> >>  Le ven. 17 avril 2020 à 23:59, Andy Shevchenko
> >>  <andy.shevchenko@...il.com> a écrit :
> >>  > On Fri, Apr 17, 2020 at 11:21 PM Artur Rojek
> >> <contact@...ur-rojek.eu>
> >>  > wrote:
> >
> > ...
> >
> >>  >>  +       irq = platform_get_irq(pdev, 0);
> >>  >
> >>  > Before it worked w/o IRQ, here is a regression you introduced.
> >>
> >>  Before it simply did not need the IRQ, which is provided by the
> >>  devicetree anyway. No regression here.
> >
> > Does it work without IRQ? Or it was a dead code till now?
> > For me it's clear regression. Otherwise something is really wrong in a
> > process of development of this driver.
>
> Nothing wrong here. The IRQ was not used by the driver for the
> functionality it provided before. It is required now to support the
> touchscreen channels.

This is exactly what's wrong.
Previous DTS for my (hypothetical) case has no IRQ defined. Everything
works, right?
Now, due to this change it breaks my setup. Don't you see the problem?

> >>  >>  +       if (irq < 0) {
> >>  >
> >>  >>  +               dev_err(dev, "Failed to get irq: %d\n", irq);
> >>  >
> >>  > Redundant message.
> >>  >
> >>  >>  +               return irq;
> >>  >>  +       }

-- 
With Best Regards,
Andy Shevchenko