Re: [PATCH net-next 2/7] net: phy: mscc: add support for VSC8584 PHY

Quentin Schulz
2018-09-14T16:28:28Z

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Hi Andrew,

On Fri, Sep 14, 2018 at 03:29:30PM +0200, Quentin Schulz wrote:
> Hi Andrew,
>
> On Fri, Sep 14, 2018 at 03:18:46PM +0200, Andrew Lunn wrote:
> > > Most of the init sequence of a PHY of the package is common to all PHYs
> > > in the package, thus we use the SMI broadcast feature which enables us
> > > to propagate a write in one register of one PHY to all PHYs in the
> > > package.
> >
> > Hi Quinten
> >
> > Could you say a bit more about the broadcast. Does the SMI broadcast
> > go to all PHY everywhere on an MDIO bus, or only all PHYs within one
> > package? I'm just thinking about the case you need two of these
> > packages to cover 8 switch ports.
> >
>
> Ah sorry, that wasn't very explicit. That's a feature on the PHY side so
> my wildest guess is that it wouldn't impact any other PHY outside of
> this package. Affecting any other PHY on the bus is counter-intuitive to
> me but I'll ask the HW engineers for confirmation.
>

Confirmed by HW engineers, it only impacts PHYs in the same package.

Quentin

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