netdev - RE: [PATCH] powerpc/kmcent2: update the ethernet devices' phy properties

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Message-ID: <VI1PR04MB55679AAE8DDC3160B9CCE073ECDC0@VI1PR04MB5567.eurprd04.prod.outlook.com>
Date:   Tue, 30 Jul 2019 09:44:49 +0000
From:   Madalin-cristian Bucur <madalin.bucur@....com>
To:     Scott Wood <oss@...error.net>,
        Valentin Longchamp <valentin@...gchamp.me>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "galak@...nel.crashing.org" <galak@...nel.crashing.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH] powerpc/kmcent2: update the ethernet devices' phy
 properties

> -----Original Message-----
> From: Scott Wood <oss@...error.net>
> Sent: Sunday, July 28, 2019 10:27 PM
> To: Valentin Longchamp <valentin@...gchamp.me>; linuxppc-
> dev@...ts.ozlabs.org; galak@...nel.crashing.org
> Cc: Madalin-cristian Bucur <madalin.bucur@....com>
> Subject: Re: [PATCH] powerpc/kmcent2: update the ethernet devices' phy
> properties
> 
> On Sun, 2019-07-28 at 18:01 +0200, Valentin Longchamp wrote:
> > Hi Scott, Kumar,
> >
> > Looking at this patch I have realised that I had already submitted it
> > to the mailing list nearly 2 years ago:
> >
> > https://patchwork.ozlabs.org/patch/842944/
> >
> > Could you please make sure that this one gets merged in the next
> > window, so that I avoid forgetting such a patch a 2nd time ?
> >
> > Thanks a lot
> 
> I added it to my patchwork todo list; thanks for the reminder.
> 
> > Le dim. 14 juil. 2019 à 22:05, Valentin Longchamp
> > <valentin@...gchamp.me> a écrit :
> > >
> > > Change all phy-connection-type properties to phy-mode that are better
> > > supported by the fman driver.
> > >
> > > Use the more readable fixed-link node for the 2 sgmii links.
> > >
> > > Change the RGMII link to rgmii-id as the clock delays are added by the
> > > phy.
> > >
> > > Signed-off-by: Valentin Longchamp <valentin@...gchamp.me>
> 
> I don't see any other uses of phy-mode in arch/powerpc/boot/dts/fsl, and I see
> lots of phy-connection-type with fman.  Madalin, does this patch look OK?
> 
> -Scott

Hi,

we are using "phy-connection-type" not "phy-mode" for the NXP (former Freescale)
DPAA platforms. While the two seem to be interchangeable ("phy-mode" seems to be
more recent, looking at the device tree bindings), the driver code in Linux seems
to use one or the other, not both so one should stick with the variant the driver
is using. To make things more complex, there may be dependencies in bootloaders,
I see code in u-boot using only "phy-connection-type" or only "phy-mode".

I'd leave "phy-connection-type" as is.

Madalin

> > > ---
> > >  arch/powerpc/boot/dts/fsl/kmcent2.dts | 16 +++++++++++-----
> > >  1 file changed, 11 insertions(+), 5 deletions(-)
> > >
> > > diff --git a/arch/powerpc/boot/dts/fsl/kmcent2.dts
> > > b/arch/powerpc/boot/dts/fsl/kmcent2.dts
> > > index 48b7f9797124..c3e0741cafb1 100644
> > > --- a/arch/powerpc/boot/dts/fsl/kmcent2.dts
> > > +++ b/arch/powerpc/boot/dts/fsl/kmcent2.dts
> > > @@ -210,13 +210,19 @@
> > >
> > >                 fman@...000 {
> > >                         ethernet@...00 {
> > > -                               fixed-link = <0 1 1000 0 0>;
> > > -                               phy-connection-type = "sgmii";
> > > +                               phy-mode = "sgmii";
> > > +                               fixed-link {
> > > +                                       speed = <1000>;
> > > +                                       full-duplex;
> > > +                               };
> > >                         };
> > >
> > >                         ethernet@...00 {
> > > -                               fixed-link = <1 1 1000 0 0>;
> > > -                               phy-connection-type = "sgmii";
> > > +                               phy-mode = "sgmii";
> > > +                               fixed-link {
> > > +                                       speed = <1000>;
> > > +                                       full-duplex;
> > > +                               };
> > >                         };
> > >
> > >                         ethernet@...00 {
> > > @@ -229,7 +235,7 @@
> > >
> > >                         ethernet@...00 {
> > >                                 phy-handle = <&front_phy>;
> > > -                               phy-connection-type = "rgmii";
> > > +                               phy-mode = "rgmii-id";
> > >                         };
> > >
> > >                         mdio0: mdio@...00 {
> > > --
> > > 2.17.1
> > >
> >
> >