Arnd Bergmann wrote on Mon, Apr 19, 2021 at 02:16:36PM +0200: > In some cases, you can use the device_link infrastructure to deal > with dependencies between devices. Not sure if this would help > in your case, but have a look at device_link_add() etc in drivers/base/core.c
I'll need to actually try to convince myself but if creating the link forces driver registration then it should be workable. > > In this particular case the problem is that since 7d981405d0fd ("soc: > > imx8m: change to use platform driver") the soc probe tries to use the > > nvmem driver for ocotp fuses for imx8m devices, which isn't ready yet. > > So soc loading gets pushed back to the end of the list because it gets > > defered and other drivers relying on soc_device_match get confused > > because they wrongly think a device doesn't match a quirk when it > > actually does. > > > > If there is a way to ensure the nvmem driver gets loaded before the soc, > > that would also solve the problem nicely, and avoid the need to mess > > with all the ~50 drivers which use it. > > > > Is there a way to control in what order drivers get loaded? Something in > > the dtb perhaps? > > For built-in drivers, load order depends on the initcall level and > link order (how things are lined listed in the Makefile hierarchy). > > For loadable modules, this is up to user space in the end. > > Which of the drivers in this scenario are loadable modules? All the drivers involved in my case are built-in (nvmem, soc and final soc_device_match consumer e.g. caam_jr that crashes the kernel if soc is not identified properly). I frankly don't like the idea of moving nvmem/ above soc/ in drivers/Makefile as a "solution" to this (especially as there is one that seems to care about what soc they run on...), so I'll have a look at links first, hopefully that will work out. Thanks, -- Dominique