linux-kernel - Re: [PATCH net-next 1/2] dt-bindings: net: pcs: renesas,rzn1-miic: Add renesas,miic-phylink-active-low property

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Message-ID: <CA+V-a8u5QAY2WheMxXhoHd09KTi31ZnVO2T0FmXiVWdH8x=rxA@mail.gmail.com>
Date: Thu, 13 Nov 2025 19:05:45 +0000
From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Wolfram Sang <wsa+renesas@...g-engineering.com>, 
	Clément Léger <clement.leger@...tlin.com>, 
	Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Heiner Kallweit <hkallweit1@...il.com>, Geert Uytterhoeven <geert+renesas@...der.be>, 
	Magnus Damm <magnus.damm@...il.com>, linux-renesas-soc@...r.kernel.org, 
	netdev@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Biju Das <biju.das.jz@...renesas.com>, 
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>, 
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH net-next 1/2] dt-bindings: net: pcs: renesas,rzn1-miic:
 Add renesas,miic-phylink-active-low property

Hi Russell,

On Thu, Nov 13, 2025 at 3:58 PM Russell King (Oracle)
<linux@...linux.org.uk> wrote:
>
> On Thu, Nov 13, 2025 at 02:45:18PM +0000, Lad, Prabhakar wrote:
> > Hi Wolfram,
> >
> > On Wed, Nov 12, 2025 at 8:40 PM Wolfram Sang
> > <wsa+renesas@...g-engineering.com> wrote:
> > >
> > > Hi Prabhakar,
> > >
> > > > Add the boolean DT property `renesas,miic-phylink-active-low` to the RZN1
> > >
> > > Hmm, we already have "renesas,ether-link-active-low" in
> > > renesas,ether.yaml and renesas,etheravb.yaml. Can't we reuse that?
> > >
> > On the RZ/N1x we have the below architecture
> >
> >                                                       +----> Ethernet Switch
> >                                                       |           |
> >                                                       |           v
> >     MII Converter ----------------------+      GMAC (Synopsys IP)
> >                                                       |
> >                                                       +----> EtherCAT
> > Slave Controller
> >                                                       |
> >                                                       +----> SERCOS
> > Controller
>
> I'm not sure that diagram has come out correctly. If you're going to
> draw diagrams, make sure you do it using a fixed-width font. To me,
> it looks like the MII Converter is bolted to GMAC and only has one
> connection, and the GMAC has what seems to be maybe five connections.
>
Sorry when typing the diagram the mail client showed the diagram OK
but when sent everything was messed up. Ive represented now in a
different way.

                                    +-----------------------+
                                    |   MII Converter     |
                                    +-----------+-----------+
                                                    |
           +-----------------------------------------+-------------------------------------------+
            |                                                  |
                                               |
            v                                                 v
                                             v
 +---------------------+
+---------------------------+
+------------------------------+
 | Ethernet Switch  |                   |  EtherCAT Slave      |
            |  SERCOS Controller   |
 +---------+------------+                  |  Controller
|                   +------------------------------+
               |                                  +---------------------------+
               |
               v
  +-------------------------+
 |  GMAC (Synopsys  |
 |       IP)                     |
 +--------------------------+

Cheers,
Prabhakar