Hi Greg, On 24-10-01, Greg Kroah-Hartman wrote: > On Tue, Oct 01, 2024 at 09:24:53AM +0200, Marco Felsch wrote: > > Hi, > > > > gentle ping as this is series is two months old now. > > And it was rejected as serdev does not support hotplug which of course, > usb-serial does. I hoped to get some feedback on my answer [1]. Regarding hotplug support: serdev _requires_ some sort of firmware like OF (not sure if it does work with ACPI too). That said, if serdev finds no firmware a fallback is provided to the standard serial handling. The firmware could either be added directly by the platform OF file or via OF-overlays. By making use of overlays we could gain some kind of hotplug: Once a usb devices was detected and the driver has an overlay, the overlay gets applied and the probe continues, like we do it for PCIe devices now [2]. For devices which don't have a registered overlay the standard usb-serial setup is done by exposing the serial interface to the userspace. > So until serdev is fixed up to handle that correctly, this is not going > anywhere, nor should you want it to as then you would be in charge of > code that does not work properly :) Regards, Marco [1] https://lore.kernel.org/all/20240917044948.i2eog4ondf7vna7q@xxxxxxxxxxxxxx/ [2] https://lore.kernel.org/all/7512cbb7911b8395d926e9e9e390fbb55ce3aea9.camel@xxxxxxxxxxxxxx/ > > thanks, > > greg k-h >
