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@xxxxxxxxx -- +49-151-27565287
