netdev - Re: [net-next PATCH v5 01/15] Documentation: ACPI: DSD: Document MDIO PHY

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Date:   Tue, 9 Feb 2021 20:04:09 +0530
From:   Calvin Johnson <calvin.johnson@....nxp.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Grant Likely <grant.likely@....com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Jeremy Linton <jeremy.linton@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Cristi Sovaiala <cristian.sovaiala@....com>,
        Florin Laurentiu Chiculita <florinlaurentiu.chiculita@....com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Madalin Bucur <madalin.bucur@....nxp.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Marcin Wojtas <mw@...ihalf.com>,
        Pieter Jansen Van Vuuren <pieter.jansenvv@...boosystems.io>,
        Jon <jon@...id-run.com>, Saravana Kannan <saravanak@...gle.com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        linux-kernel@...r.kernel.org, linux.cj@...il.com,
        Diana Madalina Craciun <diana.craciun@....com>,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-acpi@...r.kernel.org, Len Brown <lenb@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: [net-next PATCH v5 01/15] Documentation: ACPI: DSD: Document
 MDIO PHY

On Mon, Feb 08, 2021 at 12:01:57PM -0800, Randy Dunlap wrote:
> Hi,
> Just a couple of nits below:
> 
> On 2/8/21 7:12 AM, Calvin Johnson wrote:
> > Introduce ACPI mechanism to get PHYs registered on a MDIO bus and
> > provide them to be connected to MAC.
> > 
> > Describe properties "phy-handle" and "phy-mode".
> > 
> > Signed-off-by: Calvin Johnson <calvin.johnson@....nxp.com>
> > ---
> 
> >  Documentation/firmware-guide/acpi/dsd/phy.rst | 133 ++++++++++++++++++
> >  1 file changed, 133 insertions(+)
> >  create mode 100644 Documentation/firmware-guide/acpi/dsd/phy.rst
> > 
> > diff --git a/Documentation/firmware-guide/acpi/dsd/phy.rst b/Documentation/firmware-guide/acpi/dsd/phy.rst
> > new file mode 100644
> > index 000000000000..e1e99cae5eb2
> > --- /dev/null
> > +++ b/Documentation/firmware-guide/acpi/dsd/phy.rst
> > @@ -0,0 +1,133 @@
> > +.. SPDX-License-Identifier: GPL-2.0
> > +
> > +=========================
> > +MDIO bus and PHYs in ACPI
> > +=========================
> > +
> > +The PHYs on an MDIO bus [1] are probed and registered using
> > +fwnode_mdiobus_register_phy().
> > +
> > +Later, for connecting these PHYs to MAC, the PHYs registered on the
> 
>                                     to a MAC,
Each PHY is connected to a MAC. So I'll change it to "PHYs to their respective MACs".
> 
> > +MDIO bus have to be referenced.
> > +
> > +This document introduces two _DSD properties that are to be used
> > +for connecting PHYs on the MDIO bus [3] to the MAC layer.
> > +
> > +These properties are defined in accordance with the "Device
> > +Properties UUID For _DSD" [2] document and the
> > +daffd814-6eba-4d8c-8a91-bc9bbf4aa301 UUID must be used in the Device
> > +Data Descriptors containing them.
> > +
> > +phy-handle
> > +----------
> 
> ...
> 
> > +
> > +Later, during the MAC driver initialization, the registered PHY devices
> > +have to be retrieved from the MDIO bus. For this, the MAC driver need
> 
>                                                                     needs
> 
> > +references to the previously registered PHYs which are provided
> > +as device object references (e.g. \_SB.MDI0.PHY1).
> 
> 
> thanks.
> -- 
> ~Randy
>