linux-kernel - Re: [PATCH v2 1/2] dt-bindings: phy: ti: phy-gmii-sel: Add bindings for J7200

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Date:   Fri, 19 Aug 2022 11:29:32 +0530
From:   Siddharth Vadapalli <s-vadapalli@...com>
To:     Rob Herring <robh@...nel.org>
CC:     <lee.jones@...aro.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <kishon@...com>, <vkoul@...nel.org>, <dan.carpenter@...cle.com>,
        <grygorii.strashko@...com>, <rogerq@...nel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-phy@...ts.infradead.org>, <s-vadapalli@...com>
Subject: Re: [PATCH v2 1/2] dt-bindings: phy: ti: phy-gmii-sel: Add bindings
 for J7200

Hello Rob,

On 18/08/22 20:13, Rob Herring wrote:
> On Tue, Aug 16, 2022 at 11:28:47AM +0530, Siddharth Vadapalli wrote:
>> TI's J7200 SoC supports additional PHY modes like QSGMII and SGMII
>> that are not supported on earlier SoCs. Add a compatible for it.
>>
>> Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
>> ---
>>  .../mfd/ti,j721e-system-controller.yaml       |  5 ++++
>>  .../bindings/phy/ti,phy-gmii-sel.yaml         | 27 ++++++++++++++++++-
>>  2 files changed, 31 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/mfd/ti,j721e-system-controller.yaml b/Documentation/devicetree/bindings/mfd/ti,j721e-system-controller.yaml
>> index 73cffc45e056..527fd47b648b 100644
>> --- a/Documentation/devicetree/bindings/mfd/ti,j721e-system-controller.yaml
>> +++ b/Documentation/devicetree/bindings/mfd/ti,j721e-system-controller.yaml
>> @@ -54,6 +54,11 @@ patternProperties:
>>      description:
>>        Clock provider for TI EHRPWM nodes.
>>  
>> +  "phy@[0-9a-f]+$":
>> +    type: object
>> +    description:
>> +      This is the register to set phy mode through phy-gmii-sel driver.
> 
> No properties for this node? A whole node for 1 register?
> 
> Or this node is ti,phy-gmii-sel.yaml? If so, add a $ref to it.

Thank you for reviewing the patch. Yes, the node is for
ti,phy-gmii-sel.yaml. I will add the $ref for it.

> 
>> +
>>  required:
>>    - compatible
>>    - reg
>> diff --git a/Documentation/devicetree/bindings/phy/ti,phy-gmii-sel.yaml b/Documentation/devicetree/bindings/phy/ti,phy-gmii-sel.yaml
>> index ff8a6d9eb153..54da408d0360 100644
>> --- a/Documentation/devicetree/bindings/phy/ti,phy-gmii-sel.yaml
>> +++ b/Documentation/devicetree/bindings/phy/ti,phy-gmii-sel.yaml
>> @@ -53,12 +53,21 @@ properties:
>>        - ti,am43xx-phy-gmii-sel
>>        - ti,dm814-phy-gmii-sel
>>        - ti,am654-phy-gmii-sel
>> +      - ti,j7200-cpsw5g-phy-gmii-sel
>>  
>>    reg:
>>      maxItems: 1
>>  
>>    '#phy-cells': true
>>  
>> +  ti,qsgmii-main-ports:
>> +    $ref: /schemas/types.yaml#/definitions/uint32-array
>> +    description: |
>> +      Required only for QSGMII mode. Array to select the port for
>> +      QSGMII main mode. Rest of the ports are selected as QSGMII_SUB
>> +      ports automatically. Any one of the 4 CPSW5G ports can act as the
>> +      main port with the rest of them being the QSGMII_SUB ports.
> 
> Constraints? 

This is an optional property that should only be used for the
ti,j7200-cpsw5g-phy-gmii-sel compatible if it is used. I did not realize
that by defining it here, I had automatically defined it as a valid
property for all the compatibles. I will restrict this property only to
the ti,j7200-cpsw5g-phy-gmii-sel compatible by extending the if-then
statement below, adding an else statement with "ti,qsgmii-main-ports:
false", which will disallow this property for other compatibles.

> 
>> +
>>  allOf:
>>    - if:
>>        properties:
>> @@ -73,6 +82,22 @@ allOf:
>>          '#phy-cells':
>>            const: 1
>>            description: CPSW port number (starting from 1)
>> +  - if:
>> +      properties:
>> +        compatible:
>> +          contains:
>> +            enum:
>> +              - ti,j7200-cpsw5g-phy-gmii-sel
>> +    then:
>> +      properties:
>> +        '#phy-cells':
>> +          const: 1
>> +          description: CPSW port number (starting from 1)
>> +        ti,qsgmii-main-ports:
>> +          maxItems: 1
> 
> An array, but only 1 entry allowed?

For the ti,j7200-cpsw5g-phy-gmii-sel compatible, only one entry is
allowed, but in the future, I will be adding a new compatible which will
require two entries for the ti,qsgmii-main-ports property. On TI's J721e
device, there are a total of 8 external ports, therefore making it
possible to configure them as two sets of QSGMII interfaces. This
requires two qsgmii-main ports which can be specified in the
ti,qsgmii-main-ports property as an array. Therefore, I have declared
the property as an array.

> 
>> +          items:
>> +            minimum: 1
>> +            maximum: 4
> 
> Can't this be up above?

Yes, I will move it to the top where the ti,qsgmii-main-ports property
is defined.

Regards,
Siddharth.