netdev - Re: [PATCH 2/2] dt-bindings: net: dsa: mediatek,mt7530: document MDIO-bus

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Message-ID: <e4feeac2-636b-8b75-53a5-7603325fb411@arinc9.com>
Date:   Sun, 30 Apr 2023 15:34:43 +0300
From:   Arınç ÜNAL <arinc.unal@...nc9.com>
To:     David Bauer <mail@...id-bauer.net>, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Daniel Golle <daniel@...rotopia.org>
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 2/2] dt-bindings: net: dsa: mediatek,mt7530: document
 MDIO-bus

On 30.04.2023 14:28, David Bauer wrote:
> Document the ability to add nodes for the MDIO bus connecting the
> switch-internal PHYs.

This is quite interesting. Currently the PHY muxing feature for the 
MT7530 switch looks for some fake ethernet-phy definitions on the 
mdio-bus where the switch is also defined.

Looking at the binding here, there will be an mdio node under the switch 
node. This could be useful to define the ethernet-phys for PHY muxing 
here instead, so we don't waste the register addresses on the parent 
mdio-bus for fake things. It looks like this should work right out of 
the box. I will do some tests.

Are there any examples as to what to configure on the switch PHYs with 
this change?

> 
> Signed-off-by: David Bauer <mail@...id-bauer.net>
> ---
>   .../devicetree/bindings/net/dsa/mediatek,mt7530.yaml        | 6 ++++++
>   1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml b/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml
> index e532c6b795f4..50f8f83cc440 100644
> --- a/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml
> +++ b/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml
> @@ -128,6 +128,12 @@ properties:
>         See Documentation/devicetree/bindings/regulator/mt6323-regulator.txt for
>         details for the regulator setup on these boards.
>   
> +  mdio:
> +    $ref: /schemas/net/mdio.yaml#
> +    unevaluatedProperties: false
> +    description:
> +      Node for the internal MDIO bus connected to the embedded ethernet-PHYs.

Please set this property as false for mediatek,mt7988-switch as it 
doesn't use MDIO.

Arınç