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

[Jie Luo]

On 11/27/2023 9:22 PM, Andrew Lunn wrote:
> On Mon, Nov 27, 2023 at 02:21:46PM +0800, Jie Luo wrote:
> > On 11/27/2023 1:31 AM, Andrew Lunn wrote:
> > > > +		/* There are two PCSs available for QCA8084, which support the
> > > > +		 * following interface modes.
> > > > +		 *
> > > > +		 * 1. PHY_INTERFACE_MODE_10G_QXGMII utilizes PCS1 for all
> > > > +		 * available 4 ports, which is for all link speeds.
> > > > +		 *
> > > > +		 * 2. PHY_INTERFACE_MODE_2500BASEX utilizes PCS0 for the
> > > > +		 * fourth port, which is only for the link speed 2500M same
> > > > +		 * as QCA8081.
> > > > +		 *
> > > > +		 * 3. PHY_INTERFACE_MODE_SGMII utilizes PCS0 for the fourth
> > > > +		 * port, which is for the link speed 10M, 100M and 1000M same
> > > > +		 * as QCA8081.
> > > > +		 */
> > >
> > > How are these 3 modes configured? I don't see any software
> > > configuration of this in these drivers. Can it only by configured by
> > > strapping?
> >
> > 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.