Re: [PATCH v2 0/2] firmware: arm_scmi: Ensure automatic module loading

[Sudeep Holla]

On Thu, Jun 18, 2026 at 10:31:12PM +0200, Hans de Goede wrote:
> Hi,
> 
> On 18-Jun-26 17:56, Bjorn Andersson wrote:
> > SCMI drivers such as the Arm SCMI CPUfreq driver are allowed to built as
> > modules, but they are then not automatically loaded. Rework the SCMI
> > device table alias support to make modpost consume the information from
> > MODULE_DEVICE_TABLE(scmi, ...) and allow drivers to be loaded based on
> > this information, if known. Also add a protocol-based alias to also
> > trigger driver loading when only the SCMI protocol id is known.
> > 
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxxxxxxxx>
> 
> So I just gave this a test spin and unfortunately it does not work.
> 
> The problem with Fedora's kernel-config / setup is that the
> request_module() from patch 2/2 runs from the initramfs, but
> the scmi_cpufreq module is only available in the rootfs.
> 
> It does work if I explictly add the scmi_cpufreq module to
> the initramfs, then it does get autoloaded.
> 
> We really need some place to put a uevent sysfs attr which then
> gets replayed when udev is restarted from the rootfs and then
> re-reads all the uevent files as part of its coldplug
> enumeration.
> 

I don't have much knowledge on uevent to provide any suggestions/help.
But isn't this a generic requirement ? I mean you could have modules
install on the rootfs and not all of them are packed in initramfs ?
Just wondering if that works for other modules, we can examine how
do they work and what are we missing ?

-- 
Regards,
Sudeep