netdev - Re: [net-next PATCH v3 4/5] net: phy: Introduce fwnode_get_phy

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Message-ID: <20200511073912.GB12725@lsv03152.swis.in-blr01.nxp.com>
Date:   Mon, 11 May 2020 13:09:12 +0530
From:   Calvin Johnson <calvin.johnson@....nxp.com>
To:     Jeremy Linton <jeremy.linton@....com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        linux.cj@...il.com, Florian Fainelli <f.fainelli@...il.com>,
        Cristi Sovaiala <cristian.sovaiala@....com>,
        Florin Laurentiu Chiculita <florinlaurentiu.chiculita@....com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Madalin Bucur <madalin.bucur@....nxp.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Varun Sethi <V.Sethi@....com>,
        "Rajesh V . Bikkina" <rajesh.bikkina@....com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Diana Madalina Craciun <diana.craciun@....com>,
        netdev <netdev@...r.kernel.org>, Marcin Wojtas <mw@...ihalf.com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Makarand Pawagi <makarand.pawagi@....com>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Pankaj Bansal <pankaj.bansal@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [net-next PATCH v3 4/5] net: phy: Introduce fwnode_get_phy_id()

On Fri, May 08, 2020 at 05:48:33PM -0500, Jeremy Linton wrote:
> Hi,
> 
> On 5/8/20 3:27 PM, Andrew Lunn wrote:
> > > > There is a very small number of devices where the vendor messed up,
> > > > and did not put valid contents in the ID registers. In such cases, we
> > > > can read the IDs from device tree. These are then used in exactly the
> > > > same way as if they were read from the device.
> > > > 
> > > 
> > > Is that the case here?
> > 
> > Sorry, I don't understand the question?
> 
> I was asking in general, does this machine report the ID's correctly. More
> directed at Calvin, but part of it is the board vendor too. So I suspect no
> one can really answer "yes", despite that seeming to be the case.

I had tested RGMII PHYs(AR8035) with c22 using mdiobus_register. Vendor ID was
read out correctly while autoprobing.

AQR107(c45) PHYs that were connected gave back 0x00. This is expected
because the MDIO bus is configured to talk c22.

Regards
Calvin