On 07.08.20 16:17, Sven Van Asbroeck wrote: Hi, > I believe you're asking: "how do I associate device tree nodes to > devices on a dynamically discoverable bus such as USB or PCI" right ? > > I believe that already exists. You can describe the _expected_ pci or > usb topology in the > devicetree. If a device gets detected in a spot on the bus described > in the tree, that > snippet will be automatically associated with this device. > > How to for usb: > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/usb/usb-device.txt?h=v5.8 > > How to for pci: > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/pci/pci.txt?h=v5.8 Thanks, that looks good. But I've still got another problem: how can I use DT along w/ ACPI ? The scenario goes like this: * machine boots and probes normally w/ ACPI * device is detected via USB, PCI, DMI, etc -> driver gets active * driver loads (or carries) a DT snippet * devices on the bus are instantiated via this DT snippet (driver could also be some udev vodoo) Example a: * generic usb i2c dongle w/ some i2c devices attached behind it * config (or DT snippet) somewhere in the FS Example b: * x86 board driver (eg. apu2/3/4), probed via DMI * just instantiates a bunch of generic drivers and wires up devices (gpio, leds, keys, ...) Do you think we can already do that ? Otherwise, what has to be done to achieve that ? --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
