linux-kernel - Re: [PATCH v1 2/2] of: property: fw_devlink: Add support for "phy-handle" property

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Message-ID: <CAGETcx_MiezJGoJP8LOfVACU0dQbJmcqcwugded_tJ+OLrECPw@mail.gmail.com>
Date:   Tue, 17 Aug 2021 11:18:13 -0700
From:   Saravana Kannan <saravanak@...gle.com>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Frank Rowand <frowand.list@...il.com>,
        Android Kernel Team <kernel-team@...roid.com>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH v1 2/2] of: property: fw_devlink: Add support for
 "phy-handle" property

On Mon, Aug 16, 2021 at 2:11 PM Rob Herring <robh+dt@...nel.org> wrote:
>
> On Mon, Aug 16, 2021 at 3:43 PM Saravana Kannan <saravanak@...gle.com> wrote:
> >
> > On Sat, Aug 14, 2021 at 8:22 AM Andrew Lunn <andrew@...n.ch> wrote:
> > >
> > > Hi Saravana
> > >
> > > > Hi Andrew,
> > > >
> > >
> > > > Also there
> > > > are so many phy related properties that my head is spinning. Is there a
> > > > "phy" property (which is different from "phys") that treated exactly as
> > > > "phy-handle"?
> > >
> > > Sorry, i don't understand your question.
> >
> > Sorry. I was just saying I understand the "phy-handle" DT property
> > (seems specific to ethernet PHY) and "phys" DT property (seems to be
> > for generic PHYs -- used mostly by display and USB?). But I noticed
> > there's yet another "phy" DT property which I'm not sure I understand.
> > It seems to be used by display and ethernet and seems to be a
> > deprecated property. If you can explain that DT property in the
> > context of networking and how to interpret it as a human, that'd be
> > nice.
>
> For net devices, you can have 2 PHYs. 'phys' is the serdes phy and
> 'phy-handle' is the ethernet (typically) phy. On some chips, a serdes
> phy can do PCS (ethernet), SATA, PCIe.
>
> 'phy' is deprecated, so ignore it. The one case for displays I see in
> display/exynos/exynos_hdmi.txt should be deprecated as well.
>
> There's also 'usb-phy' which should be deprecated.

Thanks for the explanation Rob. I'll ignore phy and usb-phy unless it
becomes an issue for any future changes/improvements.

-Saravana


-Saravana