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

["Arınç ÜNAL" <arinc.unal@arinc9.com>]

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