netdev - Re: [PATCH v6 3/6] net: phy: at803x: add QCA8084 ethernet phy support

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Date: Tue, 28 Nov 2023 09:00:29 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Jie Luo <quic_luoj@...cinc.com>
Cc: Andrew Lunn <andrew@...n.ch>, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	hkallweit1@...il.com, corbet@....net, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org
Subject: Re: [PATCH v6 3/6] net: phy: at803x: add QCA8084 ethernet phy support

On Tue, Nov 28, 2023 at 03:16:45PM +0800, Jie Luo wrote:
> > > The interface mode is passed in the .config_init, which is configured
> > > by the PCS driver, the hardware register is located in the PCS, this
> > > driver will be pushed later.
> > 
> > Is this the same as how the syqca807x works? Can the PCS driver be
> > shared by these two drivers?
> 
> I am not sure syqca807x, would you point me the code path of this driver?
> 
> > 
> > What i don't like at the moment is that we have two driver
> > developments going on at once for hardware which seems very similar,
> > but no apparent cooperation?
> > 
> > 	Andrew
> 
> The PCS of qca8084 is the PHY PCS, which should be new PCS driver,
> in the previous chips, we don't have this kind of PHY PCS.

No. PCS drivers are for MAC-side PCS drivers, not PHY-side PCS drivers.

                     +-------------
		     |     PHY
MAC---PCS --- link --- PCS --- ...
       ^             |  ^
       |	     +--|----------
  For this PCS          |
                  Not for this PCS

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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