Hello Enrico, On Fri, Aug 7, 2020 at 7:27 AM Enrico Weigelt, metux IT consult <info@xxxxxxxxx> wrote: > > In both cases it would be nice to have the actual device configuration > written as a DT snippet, which just needs to be loaded. > 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 For example, associate a mac address to an ethernet controller on a pcie bus via the devicetree. "reg" (which describes pcie topology/address) still needs filling in. &pcie { host@0 { #address-cells = <3>; #size-cells = <2>; reg = <0 0 0 0 0>; bcm5778: bcm5778@0 { reg = <0 0 0 0 0>; mac-address = [CA 11 AB 1E 10 01]; }; }; };
