netdev - Re: [PATCH 1/4] dt-bindings: net: renesas,etheravb: Add additional clocks

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Message-ID: <CAMuHMdUbkYy5chXfvyzC6L0HzDRbyzAKx2gzTMcCz=N-rdLoAg@mail.gmail.com>
Date:   Fri, 8 Jan 2021 15:24:03 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Adam Ford <aford173@...il.com>
Cc:     Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Adam Ford-BE <aford@...conembedded.com>,
        Sergei Shtylyov <sergei.shtylyov@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Magnus Damm <magnus.damm@...il.com>,
        netdev <netdev@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] dt-bindings: net: renesas,etheravb: Add additional clocks

Hi Adam,

On Fri, Jan 8, 2021 at 3:11 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> On Mon, Dec 28, 2020 at 10:32 PM Adam Ford <aford173@...il.com> wrote:
> > The AVB driver assumes there is an external clock, but it could
> > be driven by an external clock.  In order to enable a programmable
> > clock, it needs to be added to the clocks list and enabled in the
> > driver.  Since there currently only one clock, there is no
> > clock-names list either.
> >
> > Update bindings to add the additional optional clock, and explicitly
> > name both of them.
> >
> > Signed-off-by: Adam Ford <aford173@...il.com>
>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

Upon second look...

>> --- a/Documentation/devicetree/bindings/net/renesas,etheravb.yaml
>> +++ b/Documentation/devicetree/bindings/net/renesas,etheravb.yaml
>> @@ -49,7 +49,16 @@ properties:
>>    interrupt-names: true
>>
>>    clocks:
>> -    maxItems: 1
>> +    minItems: 1
>> +    maxItems: 2
>> +    items:
>> +      - description: AVB functional clock
>> +      - description: Optional TXC reference clock
>> +
>> +  clock-names:
>> +    items:
>> +      - const: fck
>> +      - const: txc_refclk

On R-Car Gen3 and RZ/G2, RGMII is used, and this clock is called
"txcrefclk", i.e. without underscore.
On R-Car Gen2, GMII is used, and this clock is called "gtxrefclk".

Perhaps it should just be called "refclk"?

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds