Date:   Fri, 2 Sep 2022 11:39:59 +0530
From:   Siddharth Vadapalli <s-vadapalli@...com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <krzysztof.kozlowski+dt@...aro.org>
CC:     <robh+dt@...nel.org>, <lee.jones@...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 v4 1/2] dt-bindings: phy: ti: phy-gmii-sel: Add bindings
 for J7200

Hello Krzysztof,

On 01/09/22 20:51, Krzysztof Kozlowski wrote:
> On 01/09/2022 11:55, 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       |  6 ++++
>>  .../bindings/phy/ti,phy-gmii-sel.yaml         | 30 ++++++++++++++++++-
>>  2 files changed, 35 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 1aeac43cad92..802374e7645f 100644
>> --- a/Documentation/devicetree/bindings/mfd/ti,j721e-system-controller.yaml
>> +++ b/Documentation/devicetree/bindings/mfd/ti,j721e-system-controller.yaml
>> @@ -54,6 +54,12 @@ patternProperties:
>>      description:
>>        Clock provider for TI EHRPWM nodes.
>>  
>> +  "phy@[0-9a-f]+$":
>> +    type: object
>> +    $ref: /schemas/phy/phy-provider.yaml
> 
> You need instead ref to specific device bindings/schema. Probably to
> /schemas/phy/ti,phy-gmii-sel.yaml#

Thank you for the clarification. I will update $ref to
"/schemas/phy/ti,phy-gmii-sel.yaml#" in the v5 series.

> 
> This was entirely different in v3, so your change is very confusing.

I had misunderstood Rob's comment in the v3 patch. I had initially
provided the relative path to the bindings file ti,phy-gmii-sel.yaml in
the v3 patch. When Rob commented "/schemas/phy/..", I misunderstood and
thought that I had to point $ref to a generic phy-provider schema
present in the dt-schema repo and thus, in this v4 patch, I had updated
$ref accordingly.

> 
>> +    description:
>> +      This is the register to set phy mode through phy-gmii-sel driver.
> 
> I don't understand the description. Please focus on the hardware not
> some drivers - what is here? Phy for something?

I will fix the description, updating it to the following:
"Address of the CTRLMMR_ENETx_CTRL registers which are used to configure
the phy-mode of the CPSW MAC ports."

Please let me know if the above description is fine.

> 
>> +
>>  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..0ffb97f1a77c 100644
>> --- a/Documentation/devicetree/bindings/phy/ti,phy-gmii-sel.yaml
>> +++ b/Documentation/devicetree/bindings/phy/ti,phy-gmii-sel.yaml
>> @@ -53,12 +53,24 @@ 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.
>> +    items:
>> +      minimum: 1
>> +      maximum: 4
>> +
>>  allOf:
>>    - if:
>>        properties:
>> @@ -73,6 +85,22 @@ allOf:
>>          '#phy-cells':
>>            const: 1
>>            description: CPSW port number (starting from 1)
> 
> Blank line

I will fix this in the v5 series.

> 
> 
>> +  - 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
> 
> It does not really make sense to limit items here, in the context of
> this patch. You got a comment for it already. Your patch should make
> sense on its own.

I had defined the property as an array because there are more than one
QSGMII main ports for other devices for which I will be posting the
patches. I had planned to reuse this property, with "maxItems: 2" in the
future patches for other compatibles. However, as suggested by you, I
will change the property to a uint32 instead of uint32-array in this
series. Later, in my future patches for other devices, I will change it
back to a uint32-array when I reuse the property.

> 
>> +    else:
>> +      properties:
>> +        ti,qsgmii-main-ports: false
> 
> Blank line

I will fix this in the v5 series.

> 
>>    - if:
>>        properties:
>>          compatible:
>> @@ -97,7 +125,7 @@ additionalProperties: false
>>  
>>  examples:
>>    - |
>> -    phy_gmii_sel: phy-gmii-sel@650 {
>> +    phy_gmii_sel: phy@650 {
> 
> Split cleanup into separate patch.

I will do so. Thank you for reviewing the patch.

Regards,
Siddharth.

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