Re: [PATCH v4 09/10] doc: lx2160a: document the sd1 hwconfig option

[Vincent Jardin <vjardin@free.fr>]

Hi Vladimir,

> > +		mode        dpmac.2 port   dpmac.1 port
> > +		2x100g      100GE          100GE
> > +		100g4x25g   100GE          4x 25G: dpmac.3 to dpmac.6
> > +		2x40g       40GE           40GE
> > +		40g4x10g    40GE           4x XFI: dpmac.3 to dpmac.6
> > +		100g4x10g   100GE          4x XFI: dpmac.3 to dpmac.6
> 
> How much do you plan to extend this, really?

That's it. They are the 5 scenarios I am interested in for my use cases.
I did briefly try some others split of the first 4 lanes instead of 100G
and 40G, it seems workable.

I'll leave those to who ever needs it.

> Do you ever plan to support a mode with multiple 'from' modes?
> 
> Like for example, 100g4x25g can come either from 2x100g, or from 100g4x10g.
> The sd1_enter() recursion and graph traversal becomes quite a bit more
> complicated.

I do not think it is needed starting from a uboot/boot settings.
At the current states, SD1 is always from RCW 13 (or 20).
It means that sd1 cannot be in 100G+4x10G when 100G+4x25G is requested.

> But in principle, there's nothing saying you can transition to one
> SerDes protocol just from a single source. In that sense, I think your
> choices are rather arbitrary and may not suit everyone, so talking about
> multiple sources now seems rather adequate.

I guess you are right that more transitions should be possible, but I'd
like to leave those for a later design. I guess, based on the current
user uboot shell and env/hwconfig, we can still reshuffle it later for
more scenarios.

best regards,
  Vnincent