Re: [PATCH net v2 2/2] ptp: idt82p33: implement double dco time correction

[Jakub Kicinski]

On Mon, 20 Sep 2021 14:08:37 +0000 Min Li wrote:
> > > We use this parameter to specify firmware so that module can be
> > > autoloaded /etc/modprobe.d/modname.conf  
> > 
> > Sorry, I don't understand. The firmware is in /lib/firmware.
> > Previously you used a card coded name (whatever FW_FILENAME is,
> > "idt82p33xxx.bin"?). This patch adds the ability to change the firmware file
> > name by a module param.
> > 
> > Now let me repeat the question - what's the point of user changing the
> > requested firmware name if they can simply rename the file?  
> 
> We have different firmware named after different 1588 profiles. If we
> rename firmware, it would make every profile  look same and
> confusing.

You can use symlinks to "choose" which FW will be loaded by the kernel:

ls -sn $real_fw_filename $FW_FILENAME

> On the other hand, with this module parameter, we can have
> phc module auto start with correct firmware.