linux-kernel - Re: [RFC PATCH net-next 6/6] microchip: lan865x: add device-tree support for Microchip's LAN865X MACPHY

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Message-ID: <439bf5eb-c146-2f67-1d64-4efa100ee85a@linaro.org>
Date:   Tue, 12 Sep 2023 15:17:26 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Parthiban.Veerasooran@...rochip.com
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        Horatiu.Vultur@...rochip.com, Woojung.Huh@...rochip.com,
        Nicolas.Ferre@...rochip.com, UNGLinuxDriver@...rochip.com,
        Thorsten.Kummermehr@...rochip.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, corbet@....net, Steen.Hegelund@...rochip.com,
        rdunlap@...radead.org, horms@...nel.org, casper.casan@...il.com,
        andrew@...n.ch
Subject: Re: [RFC PATCH net-next 6/6] microchip: lan865x: add device-tree
 support for Microchip's LAN865X MACPHY

On 12/09/2023 14:15, Parthiban.Veerasooran@...rochip.com wrote:
> Hi Krzysztof,
> 
> Thank you for reviewing the patch.
> 
> On 10/09/23 4:25 pm, Krzysztof Kozlowski wrote:
>> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>>
>> On 08/09/2023 16:29, Parthiban Veerasooran wrote:
>>> Add device-tree support for Microchip's LAN865X MACPHY for configuring
>>> the OPEN Alliance 10BASE-T1x MACPHY Serial Interface parameters.
>>
>> Please use subject prefixes matching the subsystem. You can get them for
>> example with `git log --oneline -- DIRECTORY_OR_FILE` on the directory
>> your patch is touching.
> Ok sure, so it will become like,
> 
> dt-bindings: net: add device-tree support for Microchip's LAN865X MACPHY
> 
> I will correct it in the next revision.

"device-tree support for " is redundant, drop

>>
>>>
>>> Signed-off-by: Parthiban Veerasooran <Parthiban.Veerasooran@...rochip.com>
>>> ---
>>>   .../bindings/net/microchip,lan865x.yaml       | 54 +++++++++++++++++++
>>>   MAINTAINERS                                   |  1 +
>>>   2 files changed, 55 insertions(+)
>>>   create mode 100644 Documentation/devicetree/bindings/net/microchip,lan865x.yaml
>>>
>>> diff --git a/Documentation/devicetree/bindings/net/microchip,lan865x.yaml b/Documentation/devicetree/bindings/net/microchip,lan865x.yaml
>>> new file mode 100644
>>> index 000000000000..3465b2c97690
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/net/microchip,lan865x.yaml
>>> @@ -0,0 +1,54 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/net/microchip,lan865x.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Microchip LAN8650/1 10BASE-T1S MACPHY Ethernet Controllers
>>> +
>>> +maintainers:
>>> +  - Parthiban Veerasooran <parthiban.veerasooran@...rochip.com>
>>> +
>>> +description: |
>>> +  Device tree properties for LAN8650/1 10BASE-T1S MACPHY Ethernet
>>
>> Drop "Device tree properties for" and instead describe the hardware.
> sure, will do it.
>>
>>> +  controller.
>>> +
>>> +allOf:
>>> +  - $ref: ethernet-controller.yaml#
>>> +
>>> +properties:
>>> +  compatible:
>>> +    items:
>>
>> No need for items. Just enum.
> Ok noted.
>>
>>
>>> +      - enum:
>>> +          - microchip,lan865x
>>
>> No wildcards in compatibles.
> Yes then we don't need enum also isn't it?

I don't see correlation between these two. Please read the writing
bindings guidelines.


>>
>> Missing blank line.
> Ok will add it.
>>
>>
>>
>>> +  reg:
>>> +    maxItems: 1
>>> +
>>> +  local-mac-address: true
>>> +  oa-chunk-size: true
>>> +  oa-tx-cut-through: true
>>> +  oa-rx-cut-through: true
>>> +  oa-protected: true
>>
>> What are all these? Where are they defined that you skip description,
>> type and vendor prefix?
> Ok missed it. Will do it in the next revision.

No, drop them or explain why they are hardware properties.

>>
>>> +
>>> +required:
>>> +  - compatible
>>> +  - reg
>>> +
>>> +additionalProperties: false
>>> +
>>> +examples:
>>> +  - |
>>> +    spi {
>>> +        #address-cells = <1>;
>>> +        #size-cells = <0>;
>>> +
>>> +        ethernet@1{
>>
>> Missing space
> Ok will add it.
>>
>>> +            compatible = "microchip,lan865x";
>>> +            reg = <1>; /* CE0 */
>>
>> CE0? chip-select? What does this comment mean in this context?
> Yes it is chip-select. Will add proper comment.

Why? isn't reg obvious?

Best regards,
Krzysztof