Messages in this thread | | | Subject | Re: [PATCH V3 1/3] gpio: Add virtio-gpio driver | From | "Enrico Weigelt, metux IT consult" <> | Date | Thu, 10 Jun 2021 18:00:21 +0200 |
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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
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