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

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Message-ID: <20180914162828.5e75ffh5sig4om3d@qschulz>
Date:   Fri, 14 Sep 2018 18:28:28 +0200
From:   Quentin Schulz <quentin.schulz@...tlin.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     alexandre.belloni@...tlin.com, ralf@...ux-mips.org,
        paul.burton@...s.com, jhogan@...nel.org, robh+dt@...nel.org,
        mark.rutland@....com, davem@...emloft.net, f.fainelli@...il.com,
        allan.nielsen@...rochip.com, linux-mips@...ux-mips.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, thomas.petazzoni@...tlin.com,
        antoine.tenart@...tlin.com
Subject: Re: [PATCH net-next 2/7] net: phy: mscc: add support for VSC8584 PHY

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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