linux-kernel - Re: [net-next PATCH v4 01/15] Documentation: ACPI: DSD: Document MDIO PHY

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Message-ID: <CAJZ5v0id1i57K_=7eiK0cpOE6UtsKNfR7L7UEBcN1=G+WS+1TA@mail.gmail.com>
Date:   Thu, 28 Jan 2021 13:00:40 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Calvin Johnson <calvin.johnson@....nxp.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Grant Likely <grant.likely@....com>,
        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>,
        Randy Dunlap <rdunlap@...radead.org>,
        "linux.cj" <linux.cj@...il.com>,
        Diana Madalina Craciun <diana.craciun@....com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Len Brown <lenb@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: [net-next PATCH v4 01/15] Documentation: ACPI: DSD: Document MDIO PHY

On Thu, Jan 28, 2021 at 12:27 PM Calvin Johnson
<calvin.johnson@....nxp.com> wrote:
>
> Hi Rafael,
>
> Thanks for the review. I'll work on all the comments.
>
> On Fri, Jan 22, 2021 at 08:22:21PM +0100, Rafael J. Wysocki wrote:
> > On Fri, Jan 22, 2021 at 4:43 PM Calvin Johnson
> > <calvin.johnson@....nxp.com> 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>
> > > ---
> > >
> > > Changes in v4:
> > > - More cleanup
> >
> > This looks much better that the previous versions IMV, some nits below.
> >
> > > Changes in v3: None
> > > Changes in v2:
> > > - Updated with more description in document
> > >
> > >  Documentation/firmware-guide/acpi/dsd/phy.rst | 129 ++++++++++++++++++
> > >  1 file changed, 129 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..76fca994bc99
> > > --- /dev/null
> > > +++ b/Documentation/firmware-guide/acpi/dsd/phy.rst
> > > @@ -0,0 +1,129 @@
> > > +.. 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().
> >
> > Empty line here, please.
> >
> > > +Later, for connecting these PHYs to MAC, the PHYs registered on the
> > > +MDIO bus have to be referenced.
> > > +
> > > +The UUID given below should be used as mentioned in the "Device Properties
> > > +UUID For _DSD" [2] document.
> > > +   - UUID: daffd814-6eba-4d8c-8a91-bc9bbf4aa301
> >
> > I would drop the above paragraph.
> >
> > > +
> > > +This document introduces two _DSD properties that are to be used
> > > +for PHYs on the MDIO bus.[3]
> >
> > I'd say "for connecting PHYs on the MDIO bus [3] to the MAC layer."
> > above and add the following here:
> >
> > "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
> > > +----------
> > > +For each MAC node, a device property "phy-handle" is used to reference
> > > +the PHY that is registered on an MDIO bus. This is mandatory for
> > > +network interfaces that have PHYs connected to MAC via MDIO bus.
> > > +
> > > +During the MDIO bus driver initialization, PHYs on this bus are probed
> > > +using the _ADR object as shown below and are registered on the MDIO bus.
> >
> > Do you want to mention the "reg" property here?  I think it would be
> > useful to do that.
>
> No. I think we should adhere to _ADR in MDIO case. The "reg" property for ACPI
> may be useful for other use cases that Andy is aware of.

The code should reflect this, then.  I mean it sounds like you want to
check the "reg" property only if this is a non-ACPI node.