linux-kernel - Re: [PATCH v2 3/6] dt-bindings: input: cypress,tt21000

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Message-ID: <ZFBYIZc5zKs6dpHF@google.com>
Date:   Mon, 1 May 2023 17:24:01 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Maximilian Weigand <mweigand@...igand.net>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        Alistair Francis <alistair@...stair23.me>
Subject: Re: [PATCH v2 3/6] dt-bindings: input: cypress,tt21000 - fix
 interrupt type in dts example

On Mon, May 01, 2023 at 01:30:07PM +0200, Maximilian Weigand wrote:
> Triggering the interrupt of the IRQ_TYPE_LEVEL_LOW type can lead to
> probing issues with the device for the current driver (encountered on
> the Pine64 PineNote). Basically the interrupt would be triggered before
> certain commands were sent to the device, leading to a race between the
> device responding fast enough and the irq handler fetching a data frame
> from it. Actually all devices currently using the driver already use a
> falling edge trigger.

I'd prefer we adjusted the driver to handle level interrupts properly.

Thanks.

-- 
Dmitry