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

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Message-ID: <20211218231823.49a72256@aktux>
Date:   Sat, 18 Dec 2021 23:18:23 +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:

[...]
> > > 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?
> 
I have set level interrupts via the devicetree,
things seem to work on Kobo Clara HD:
/proc/interrupts
203:      37402  gpio-mxc   6 Level     tt21000

       touchscreen@24 {
                compatible = "cypress,tt21000";
                reg = <0x24>;
                pinctrl-names = "default","sleep";
                pinctrl-0 = <&pinctrl_cyttsp5_gpio>;
                pinctrl-1 = <&pinctrl_cyttsp5_gpio_sleep>;
                interrupt-parent = <&gpio5>;
                interrupts = <6 IRQ_TYPE_LEVEL_LOW>;
                reset-gpios = <&gpio5 13 GPIO_ACTIVE_LOW>;
        };

Regards,
Andreas