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

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Date: Wed, 9 Aug 2023 12:03:19 +0300
From: Arınç ÜNAL <arinc.unal@...nc9.com>
To: Vladimir Oltean <olteanv@...il.com>
Cc: Daniel Golle <daniel@...rotopia.org>, Andrew Lunn <andrew@...n.ch>,
 Florian Fainelli <f.fainelli@...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>,
 Conor Dooley <conor+dt@...nel.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>, 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 RESEND net-next 2/2] dt-bindings: net: dsa:
 mediatek,mt7530: document MDIO-bus

On 8.08.2023 15:17, Vladimir Oltean wrote:
> On Sat, Aug 05, 2023 at 11:15:15PM +0300, Arınç ÜNAL wrote:
>> I don't see a reason to resubmit this without addressing the requested
>> change.
>>
>>>> Wouldn't we just skip the whole issue by documenting the need for defining all PHYs
>>>> used on the switch when defining the MDIO bus?
>>>
>>> Good idea, please do that.
>>
>> https://lore.kernel.org/netdev/0f501bb6-18a0-1713-b08c-6ad244c022ec@arinc9.com/
>>
>> Arınç
> 
> Arınç, where do you see that comment being added? AFAIU, it is a
> characteristic of the generic __of_mdiobus_register() code to set
> mdio->phy_mask = ~0, and nothing specific to the mt7530.

What I believe is specific to DSA is, 1:1 mapping of the port reg to the
PHY reg on the mdio bus is disabled if the mdio bus is defined. Therefore,
I believe a notice like below fits mediatek,mt7530.yaml.

diff --git a/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml b/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml
index e532c6b795f4..c59d58252cd5 100644
--- a/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml
+++ b/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml
@@ -128,6 +128,15 @@ properties:
        See Documentation/devicetree/bindings/regulator/mt6323-regulator.txt for
        details for the regulator setup on these boards.

+  mdio:
+    $ref: /schemas/net/mdio.yaml#
+    unevaluatedProperties: false
+    description:
+      Node for the internal MDIO bus connected to the embedded ethernet-PHYs.
+      For every port defined under the "^(ethernet-)?ports$" node, a PHY must be
+      defined under here and a phy-handle property must be defined under the
+      port node to point to the PHY node.
+
    mediatek,mcm:
      type: boolean
      description:

Arınç