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Date:   Mon, 11 May 2020 14:35:08 +0100
From:   Russell King - ARM Linux admin <linux@armlinux.org.uk>
To:     Andrew Lunn <andrew@lunn.ch>
Cc:     Calvin Johnson <calvin.johnson@oss.nxp.com>,
        Jeremy Linton <jeremy.linton@arm.com>,
        Andy Shevchenko <andy.shevchenko@gmail.com>,
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        Cristi Sovaiala <cristian.sovaiala@nxp.com>,
        Florin Laurentiu Chiculita <florinlaurentiu.chiculita@nxp.com>,
        Ioana Ciornei <ioana.ciornei@nxp.com>,
        Madalin Bucur <madalin.bucur@oss.nxp.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Heikki Krogerus <heikki.krogerus@linux.intel.com>,
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        "Rajesh V . Bikkina" <rajesh.bikkina@nxp.com>,
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Subject: Re: [net-next PATCH v3 4/5] net: phy: Introduce fwnode_get_phy_id()
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On Mon, May 11, 2020 at 03:04:57PM +0200, Andrew Lunn wrote:
> > NXP's LX2160ARDB platform currently has the following MDIO-PHY connection.
> > 
> > MDIO-1 ==> one 40G PHY, two 1G PHYs(C45), two 10G PHYs(C22)
> > MDIO-2 ==> one 25G PHY
> 
> It has been suggested that ACPI only support a one to one
> mapping. Each MAC has one MDIO bus, with one PHY on it. KISS.
> 
> This clearly does not work for your hardware. So not only do we need
> to solve how PHY properties are described, we also need an equivalent
> of phy-handle, so a MAC can indicate which PHY it is connected to.

I'd suggest that doesn't work for a lot of hardware. It won't work for
the Macchiatobin for example, where there are two Clause 45 NBASE-T
PHYs on one MDIO bus.

The same is likely true on the LX2160A - there can be multiple ethernet
interfaces, but IIRC only two external MDIO buses that one can hang
PHYs off of.

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