Re: [PATCH v3] net: wan: framer: Add version sysfs attribute for the Lantiq PEF2256 framer

[Jakub Kicinski <kuba@kernel.org>]

On Thu, 25 Sep 2025 09:06:13 +0200 Christophe Leroy wrote:
> Le 25/09/2025 à 01:48, Jakub Kicinski a écrit :
> > On Wed, 24 Sep 2025 17:06:47 +0200 Christophe Leroy wrote:  
> >> Lantiq PEF2256 framer has some little differences in behaviour
> >> depending on its version.
> >>
> >> Add a sysfs attribute to allow user applications to know the
> >> version.  
> > 
> > Outsider question perhaps but what is the version of?
> > It sounds like a HW revision but point releases for ASICs are quite
> > uncommon. So I suspect it's some SW/FW version?  
> 
> The datasheet of the component just calls it 'version'.
> 
> Among all registers there is a register called 'version status register' 
> which contains a single field named 'Version Number of chip'. This field 
> is an 8 bits value and the documentation tells that value 0x00 is 
> version 1.2, value 0x10 is version 2.1, etc...
> 
> > We generally recommend using devlink dev info for reporting all sort
> > of versions...  
> 
> Ok, I'll look at devlink. Based on the above, what type of 
> DEVLINK_INFO_VERSION_GENERIC_XXXX would you use here ?

That all sounds very mysterious. Maybe let's stick with sysfs if 
we don't really know the details and where to put the value..