From: "Enrico Weigelt, metux IT consult" <lkml@metux.net>
To: Linus Walleij <linus.walleij@linaro.org>,
Bartosz Golaszewski <bgolaszewski@baylibre.com>
Cc: "Enrico Weigelt, metux IT consult" <info@metux.net>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Jonathan Corbet <corbet@lwn.net>,
"Michael S. Tsirkin" <mst@redhat.com>,
Jason Wang <jasowang@redhat.com>,
Linux Doc Mailing List <linux-doc@vger.kernel.org>,
"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
virtualization@lists.linux-foundation.org,
linux-riscv@lists.infradead.org
Subject: Re: Howto listen to/handle gpio state changes ? Re: [PATCH v2 2/2] drivers: gpio: add virtio-gpio guest driver
Date: Tue, 8 Dec 2020 15:04:50 +0100 [thread overview]
Message-ID: <51d3efb7-b7eb-83d7-673a-308dd51616d3@metux.net> (raw)
In-Reply-To: <CACRpkdb4R4yHcUV2KbGEC_RkU+QmH6Xg7X+qee8sEa9TURGr8A@mail.gmail.com>
On 08.12.20 10:38, Linus Walleij wrote:
Hi,
> This is Bartosz territory, but the gpio-mockup.c driver will insert
> IRQs into the system, he went and added really core stuff
> into kernel/irq to make this happen. Notice that in Kconfig
> it does:
>
> select IRQ_SIM
>
> Then this is used:
> include/linux/irq_sim.h
>
> This is intended for simulating IRQs and both GPIO and IIO use it.
> I think this inserts IRQs from debugfs and I have no idea how
> flexible that is.
Oh, thx.
It seems to implement a pseudo-irqchip driver. I've already though about
doing that, but didn't think its worth it, just for my driver alone.
I've implemented a few irq handling cb's directly the driver. But since
we already have it, I'll reconsider :)
BUT: this wasn't exactly my question :p
I've been looking for some more direct notification callback for gpio
consumers: here the consumer would register itself as a listener on
some gpio_desc and called back when something changes (with data what
exactly changed, eg. "gpio #3 input switched to high").
Seems we currently just have the indirect path via interrupts.
--mtx
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Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
info@metux.net -- +49-151-27565287
next prev parent reply other threads:[~2020-12-08 14:07 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-03 19:11 [PATCH v2 1/2] drivers: gpio: put virtual gpio device into their own submenu Enrico Weigelt, metux IT consult
2020-12-03 19:11 ` [PATCH v2 2/2] drivers: gpio: add virtio-gpio guest driver Enrico Weigelt, metux IT consult
2020-12-04 3:35 ` Jason Wang
2020-12-04 9:36 ` Enrico Weigelt, metux IT consult
2020-12-07 3:48 ` Jason Wang
2020-12-07 9:33 ` Enrico Weigelt, metux IT consult
2020-12-08 2:49 ` Jason Wang
2021-04-13 11:07 ` Alex Bennée
2020-12-05 7:59 ` Enrico Weigelt, metux IT consult
2020-12-05 19:32 ` Michael S. Tsirkin
2020-12-05 20:05 ` Enrico Weigelt, metux IT consult
2020-12-07 3:16 ` Jason Wang
2020-12-07 13:52 ` Michael S. Tsirkin
2020-12-07 20:34 ` Enrico Weigelt, metux IT consult
2020-12-07 3:12 ` Jason Wang
2020-12-07 13:53 ` Michael S. Tsirkin
2020-12-08 2:36 ` Jason Wang
2020-12-08 7:02 ` Enrico Weigelt, metux IT consult
2020-12-09 9:31 ` Jason Wang
2020-12-09 10:33 ` Enrico Weigelt, metux IT consult
2020-12-08 10:10 ` Michal Suchánek
2020-12-08 12:33 ` Enrico Weigelt, metux IT consult
2020-12-09 10:34 ` Michal Suchánek
2020-12-05 20:15 ` Howto listen to/handle gpio state changes ? " Enrico Weigelt, metux IT consult
2020-12-08 9:38 ` Linus Walleij
2020-12-08 14:04 ` Enrico Weigelt, metux IT consult [this message]
2020-12-08 16:15 ` Grygorii Strashko
2020-12-09 8:51 ` Linus Walleij
2020-12-09 11:19 ` Arnd Bergmann
2020-12-09 12:53 ` Linus Walleij
2020-12-09 20:22 ` Grygorii Strashko
2020-12-09 20:38 ` Arnd Bergmann
2020-12-10 13:32 ` Grygorii Strashko
2021-05-24 11:27 ` Viresh Kumar
2021-05-25 12:59 ` Enrico Weigelt, metux IT consult
2021-05-26 3:32 ` Viresh Kumar
2021-07-03 8:05 ` Michael S. Tsirkin
2021-07-05 3:51 ` Viresh Kumar
2020-12-07 9:55 ` [PATCH v2 1/2] drivers: gpio: put virtual gpio device into their own submenu Andy Shevchenko
2020-12-07 10:31 ` Bartosz Golaszewski
2020-12-07 11:22 ` Enrico Weigelt, metux IT consult
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