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

Quentin Schulz
2018-09-14T13:29:30Z

[-- Attachment #1: Type: text/plain, Size: 881 bytes --]

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.

Thanks,
Quentin

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]