Date:   Sat, 18 Dec 2021 23:18:23 +0100
From:   Andreas Kemnade <andreas@kemnade.info>
To:     Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc:     Alistair Francis <alistair23@gmail.com>,
        Alistair Francis <alistair@alistair23.me>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
        devicetree <devicetree@vger.kernel.org>,
        linux-input <linux-input@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Mylene Josserand <mylene.josserand@free-electrons.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Henrik Rydberg <rydberg@bitmath.org>,
        Rob Herring <robh+dt@kernel.org>,
        =?UTF-8?B?TXlsw6huZQ==?= Josserand <mylene.josserand@bootlin.com>,
        Maxime Ripard <maxime.ripard@bootlin.com>
Subject: Re: [PATCH v2 1/4] Input: Add driver for Cypress Generation 5
 touchscreen
Message-ID: <20211218231823.49a72256@aktux>
In-Reply-To: <YbbeDFJERtP0mAIQ@google.com>
References: <20211103114830.62711-1-alistair@alistair23.me>
        <20211103114830.62711-2-alistair@alistair23.me>
        <YYYk/uisKqPNgRu0@google.com>
        <CAKmqyKOFZOLpjMY+kj2CLibFhYJ3-tL+9+cKEVzgSn9Mzq30gw@mail.gmail.com>
        <YbbeDFJERtP0mAIQ@google.com>
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Hi,

On Sun, 12 Dec 2021 21:45:48 -0800
Dmitry Torokhov <dmitry.torokhov@gmail.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