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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <82bdf2e6-35fb-74e8-1b2c-198fe8d528e6@metux.net>
Date:   Thu, 10 Jun 2021 18:00:21 +0200
From:   "Enrico Weigelt, metux IT consult" <lkml@...ux.net>
To:     Arnd Bergmann <arnd@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        "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 Mailing List <stratos-dev@...lists.linaro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <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
Subject: Re: [PATCH V3 1/3] gpio: Add virtio-gpio driver

On 10.06.21 15:22, Arnd Bergmann wrote:

> Can you give an example of how this would be hooked up to other drivers
> using those gpios. Can you give an example of how using the "gpio-keys" or
> "gpio-leds" drivers in combination with virtio-gpio looks like in the DT?

Connecting between self-probing bus'es and DT is generally tricky. IMHO
we don't have any generic mechanism for that.

I've made a few attempts, but nothing practically useful, which would be
accepted by the corresponding maintainers, yet. We'd either need some
very special logic in DT probing or pseudo-bus'es for the mapping.
(DT wants to do those connections via phandle's, which in turn need the
referenced nodes to be present in the DT).

>  From what I can tell, both the mmio and pci variants of virtio can have their
> dev->of_node populated, but I don't see the logic in register_virtio_device()
> that looks up the of_node of the virtio_device that the of_gpio code then
> tries to refer to.

Have you ever successfully bound a virtio device via DT ?


--mtx

-- 
---
Hinweis: unverschlüsselte E-Mails können leicht abgehört und manipuliert
werden ! Für eine vertrauliche Kommunikation senden Sie bitte ihren
GPG/PGP-Schlüssel zu.
---
Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
info@...ux.net -- +49-151-27565287