Re: [PATCH net-next v2 8/8] net: pse-pd: Add PD692x0 PSE controller driver

[Oleksij Rempel <o.rempel@pengutronix.de>]

On Thu, Dec 21, 2023 at 06:05:28PM +0000, Mark Brown wrote:
> On Thu, Dec 21, 2023 at 06:42:46PM +0100, Oleksij Rempel wrote:
> 
> > The main question is - how to represent a remote consumer (Powered
> > Device)? It looks for me like having a dummy regulator consumer for each
> > (PSE PI) withing the PSE framework is the simplest thing to do. User
> > should enable this dummy consumer from user space by using already
> > existing interface in case of PoDL - ETHTOOL_A_PODL_PSE_ADMIN_CONTROL
> > or new interface for Clause 33 PSE.
> 
> That's not even a dummy consumer - the physical power output from the
> system is a real, physical thing that we can point at just as much as
> any other physical device.  Some kind of library/helper thing that
> connects up with other interfaces for controlling network ports like you
> suggest above does seem like a good fit here.

@Köry,

It will be good if you add vin-supply property to your DTs. It will
allow to track all needed dependencies. If I interpret PD692x0/PD69208
manuals properly, each Manager may have only one Vmain shared for
different ports. But different managers may have different Vmains.

I assume, regulator tree will be like this:
Vmain-0
  manager@0 (assigned to ethernet-pse@3c controller)
    port0
    port1
    ..
  manager@1 (assigned to ethernet-pse@3c controller)
    port0
    port1
    ..

More complex system may look like:
Vmain-0
  manager@0 (ethernet-pse@3c)
    port0
    port1
    ..
Vmain-1
  manager@1 (ethernet-pse@3c)
    port0
    port1
    ..


Not sure how to properly represent even more complex system with
multiple controllers, in this case manager names will overlap:
Vmain-0
  manager@0 (ethernet-pse@3c)
    port0
    port1
    ..
  manager@0 (ethernet-pse@4c) <----
    port0
    port1
    ..

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