linux-kernel - Re: [PATCH v2 1/4] Input: Add driver for Cypress Generation 5 touchscreen

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Date:   Mon, 13 Dec 2021 19:49:06 +0100
From:   Andreas Kemnade <andreas@...nade.info>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Alistair Francis <alistair23@...il.com>,
        Alistair Francis <alistair@...stair23.me>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-input <linux-input@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mylene Josserand <mylene.josserand@...e-electrons.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Henrik Rydberg <rydberg@...math.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mylène Josserand <mylene.josserand@...tlin.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>
Subject: Re: [PATCH v2 1/4] Input: Add driver for Cypress Generation 5
 touchscreen

Hi,

On Sun, 12 Dec 2021 21:45:48 -0800
Dmitry Torokhov <dmitry.torokhov@...il.com> wrote:


> > > > +     rc = devm_request_threaded_irq(dev, irq, NULL, cyttsp5_handle_irq,
> > > > +                                    IRQF_TRIGGER_FALLING | IRQF_ONESHOT,  
> > >
> > > Please do not override platform setup with hardcoded triggers. Also, it
> > > is strongly recommended to use level interrupts for these peripherals.
> > >
> > > This is also likely unsafe if controller is not completely shut off and
> > > is capable of generating interrupts given input device is not yet
> > > allocated.  
> > 
> > I have dropped the `IRQF_TRIGGER_FALLING |`
> > 
> > I have tried to use level interrupts, but I can't get the device
> > working with them.  
> 
> That is weird, does the interrupt controller support level interrupts?
> 
hmm, it should, at least on the imx6 I am using them for some other
devices, I guess, on the imx7 they should work, too.
I hope I find time to give that a try the next days.

Regards,
Andreas