linux-kernel - Re: [PATCH V3 1/3] gpio: Add virtio-gpio driver

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Message-ID: <20210615111551.7tcz7teqp4olhodf@vireshk-i7>
Date:   Tue, 15 Jun 2021 16:45:51 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        "Enrico Weigelt, metux IT consult" <info@...ux.net>,
        Viresh Kumar <vireshk@...nel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Bill Mills <bill.mills@...aro.org>,
        Alex Bennée <alex.bennee@...aro.org>,
        stratos-dev@...lists.linaro.org,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        "Stefano Garzarella --cc virtualization @ lists . linux-foundation . org" 
        <sgarzare@...hat.com>, virtualization@...ts.linux-foundation.org,
        Alistair Strachan <astrachan@...gle.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>
Subject: Re: [PATCH V3 1/3] gpio: Add virtio-gpio driver

On 11-06-21, 10:22, Geert Uytterhoeven wrote:
> The same reasoning can apply to your backend daemon, so when using
> the GPIO aggregator, you can just control a full gpiochip, without
> having to implement access control on individual GPIO lines.

I tried to look at it and it surely looks very temping and may fit
well and reduce size of my backend :)

I am now wondering how interrupts can be made to work here. Do you
have anything in mind for that ?

GPIO sysfs already supports interrupts, just that you need to register
irq for the specific GPIO pins inside the aggregator ?

-- 
viresh