Re: [PATCH v2 3/5] dt-bindings: net: Add HPE GXP UMAC

[Conor Dooley]

On Wed, Aug 16, 2023 at 04:26:09PM +0000, Hawkins, Nick wrote:
> Hi Conor,
> 
> Thanks for your feedback. I will provide an explanation below.
> 
> > > +description:
> > > + HPE GXP 802.3 10/100/1000T Ethernet Unifed MAC controller.
> > > + Device node of the controller has following properties.
> > > +
> > > +properties:
> > > + compatible:
> > > + const: hpe,gxp-umac
> > > +
> 
> 
> > > + use-ncsi:
> > > + type: boolean
> > > + description:
> > > + Indicates if the device should use NCSI (Network Controlled
> > > + Sideband Interface).
> 
> 
> > How is one supposed to know if the device should use NCSI? If the
> > property is present does that mean that the mac hardware supports
> > it? Or is it determined by what board this mac is on?
> > Or is this software configuration?
> 
> Hi Conor,
> 
> There are two MAC's available in the ASIC but only one can support
> NCSI. Even though it supports NCSI does not mean the board has
> been physically wired to support it. In terms of the device tree I would
> expect the "use-ncsi" to be present in the dts board specific file.
> 
> There will be hardware configurations where both MAC0 and MAC1
> will be using the SERDES connections. In that case there will be no
> NCSI available.
> 
> Is a better description needed here to explain this?

Ah crap, I missed this yesterday - I think this came in as I was doing
my queue sweep. The improved description seems good to me, thanks for
adding to it.

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