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Message-ID: <891c0b67-abe1-416c-aa94-675f7f3d8044@arinc9.com>
Date: Sun, 13 Aug 2023 17:58:57 +0300
From: Arınç ÜNAL <arinc.unal@...nc9.com>
To: Vladimir Oltean <olteanv@...il.com>
Cc: 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>,
Woojung Huh <woojung.huh@...rochip.com>,
UNGLinuxDriver@...rochip.com,
Linus Walleij <linus.walleij@...aro.org>,
Alvin Šipraga <alsi@...g-olufsen.dk>,
Daniel Golle <daniel@...rotopia.org>,
Landen Chao <Landen.Chao@...iatek.com>,
DENG Qingfang <dqfext@...il.com>,
Sean Wang <sean.wang@...iatek.com>,
Matthias Brugger <matthias.bgg@...il.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>, mithat.guner@...ont.com,
erkin.bozoglu@...ont.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 2/4] dt-bindings: net: dsa: document internal MDIO bus
On 13.08.2023 15:59, Arınç ÜNAL wrote:
> On 13.08.2023 14:53, Vladimir Oltean wrote:
>> On Sat, Aug 12, 2023 at 10:20:43PM +0300, Arınç ÜNAL wrote:
>>> diff --git a/Documentation/devicetree/bindings/net/dsa/nxp,sja1105.yaml b/Documentation/devicetree/bindings/net/dsa/nxp,sja1105.yaml
>>> index 4d5f5cc6d031e2..82dda8fae8b16e 100644
>>> --- a/Documentation/devicetree/bindings/net/dsa/nxp,sja1105.yaml
>>> +++ b/Documentation/devicetree/bindings/net/dsa/nxp,sja1105.yaml
>>> @@ -72,6 +72,10 @@ properties:
>>> - compatible
>>> - reg
>>> + mdio:
>>> + $ref: dsa.yaml#/properties/mdio
>>> + unevaluatedProperties: false
>>
>> sja1105 does not support an "mdio" child property. I haven't checked the
>> others. Don't add properties that aren't supported.
>
> Adding the mdio property to the dsa.yaml schema will allow it on all of the
> schemas that refer to dsa.yaml such as this one. This addition here is only
> to disallow additional properties under the mdio property for this specific
> schema.
>
> That said, my understanding is that the internal MDIO bus exists on all of
> the switches controlled by DSA. Whether each individual DSA subdriver
> supports registering it does not matter in terms of documenting the
> internal MDIO bus for all DSA switches.
On top of this, I'd argue to document the internal MDIO bus on the
ethernet-switch.yaml schema instead.
Arınç
>
> SJA1110 uses the mdios property instead because it's got two internal mdio
> buses, which is why I invalidate the mdio property for it. If SJA1105 has
> also got two internal mdio buses, let me know.
>
>>
>>> +
>>> patternProperties:
>>> "^(ethernet-)?ports$":
>>> patternProperties:
>>>
>>> The nxp,sja1105.yaml schema also needed some changes.
>>>
>>> dt-bindings: net: dsa: nxp,sja1105: improve internal MDIO bus bindings
>>>
>>> SJA1110 Ethernet Switch uses the mdios property for its internal MDIO bus.
>>> Therefore, disallow the mdios property for SJA1105, and the mdio property
>>> for SJA1110.
>>>
>>> Require the phy-handle property on the non-CPU ports if the mdios property
>>> is being used.
>>>
>>> Refer to dsa.yaml#/properties/mdio to point the human readers to the
>>> description on the dsa.yaml schema.
>>>
>>> ---
>>> .../bindings/net/dsa/nxp,sja1105.yaml | 20 ++++++++++++++++++-
>>> 1 file changed, 19 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/net/dsa/nxp,sja1105.yaml b/Documentation/devicetree/bindings/net/dsa/nxp,sja1105.yaml
>>> index 82dda8fae8b16e..7d92350f1065b2 100644
>>> --- a/Documentation/devicetree/bindings/net/dsa/nxp,sja1105.yaml
>>> +++ b/Documentation/devicetree/bindings/net/dsa/nxp,sja1105.yaml
>>> @@ -52,7 +52,7 @@ properties:
>>> patternProperties:
>>> "^mdio@[0-1]$":
>>> - $ref: /schemas/net/mdio.yaml#
>>> + $ref: dsa.yaml#/properties/mdio
>>> unevaluatedProperties: false
>>> properties:
>>> @@ -128,14 +128,32 @@ allOf:
>>> then:
>>> properties:
>>> spi-cpol: false
>>> + mdios: false
>>> +
>>> required:
>>> - spi-cpha
>>> else:
>>> properties:
>>> spi-cpha: false
>>> + mdio: false
>>> +
>>> required:
>>> - spi-cpol
>>> + - if:
>>> + required: [ mdios ]
>>> + then:
>>> + patternProperties:
>>> + "^(ethernet-)?ports$":
>>> + patternProperties:
>>> + "^(ethernet-)?port@[0-9]+$":
>>> + if:
>>> + not:
>>> + required: [ ethernet ]
>>> + then:
>>> + required:
>>> + - phy-handle
>>
>> For sja1105, phylink-compatible bindings (phy-handle, fixed-link or managed)
>> are required for all ports (user, dsa or cpu).
>>
>> Also, sja1105 does not populate the slave_mii_bus, so it never uses the
>> fallback where ports implicitly connect to an internal PHY if no phylink
>> bindings are present.
>
> I'll handle these accordingly with your answer to my question above.
>
> Arınç
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