linux-kernel - Re: [PATCH v4 01/10] input: keyboard: adp5588-keys: support gpi key events as 'gpio keys'

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Date:   Wed, 31 Aug 2022 14:37:40 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Nuno Sá <nuno.sa@...log.com>
Cc:     linux-kernel@...r.kernel.org, Bartosz Golaszewski <brgl@...ev.pl>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        devicetree@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-input@...r.kernel.org,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Michael Hennerich <michael.hennerich@...log.com>
Subject: Re: [PATCH v4 01/10] input: keyboard: adp5588-keys: support gpi key
 events as 'gpio keys'

On Mon, Aug 29, 2022 at 3:15 PM Nuno Sá <nuno.sa@...log.com> wrote:

> This change replaces the support for GPIs as key event generators.
> Instead of reporting the events directly, we add a gpio based irqchip
> so that these events can be consumed by keys defined in the gpio-keys
> driver (as it's goal is indeed for keys on GPIOs capable of generating
> interrupts). With this, the gpio-adp5588 driver can also be dropped.
>
> The basic idea is that all the pins that are not being used as part of
> the keymap matrix can be possibly requested as GPIOs by gpio-keys
> (it's also fine to use these pins as plain interrupts though that's not
> really the point).
>
> Since the gpiochip now also has irqchip capabilities, we should only
> remove it after we free the device interrupt (otherwise we could, in
> theory, be handling GPIs interrupts while the gpiochip is concurrently
> removed). Thus the call 'adp5588_gpio_add()' is moved and since the
> setup phase also needs to come before making the gpios visible, we also
> need to move 'adp5588_setup()'.
>
> While at it, always select GPIOLIB so that we don't need to use #ifdef
> guards.
>
> Signed-off-by: Nuno Sá <nuno.sa@...log.com>

Makes the world simpler so:
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij