Hi, on our embedded systems we rely on systemd's persistent netdev names. Those currently do not work for USB netdevs that are connected to a platform USB bus. In https://github.com/systemd/systemd/pull/7273 a systemd patch was suggested that would allow exactly this, but it was (rightfully) said that numbering of theses busses is not guaranteed. Internally we used the patch for a while now, but exactly that has happened with one of our platforms across different kernel revisions. The following kernel patches allow suggesting a USB busnumber for each USB platform bus via a DTS alias, as can be done similarly for many other devices. In combination with above systemd patch, these changes allow use of persistent netdev names also on platform USB busses. NOTE: this patch might change ordering of busses on devices that use platform-busses, if aliases for these busses have already been defined! In the current master there are a few platforms that contain such aliases, e.g. am33xx, dm814x or imx6qdl Yours, David David R. Piegdon (2): usb core: dts: allow suggesting usb bus number for platform busses dt-bindings: allow suggesting usb bus number for usb platform busses Documentation/devicetree/bindings/usb/usb-hcd.txt | 9 +++++++ drivers/usb/core/hcd.c | 30 ++++++++++++++++++----- 2 files changed, 33 insertions(+), 6 deletions(-) -- 2.11.0
