Date: Fri, 22 Dec 2023 02:25:54 +0200
From: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
To: Rob Herring <robh@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Emil Renner Berthing <kernel@...il.dk>,
 Samin Guo <samin.guo@...rfivetech.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Jose Abreu <joabreu@...opsys.com>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Giuseppe Cavallaro <peppe.cavallaro@...com>, Andrew Lunn <andrew@...n.ch>,
 Jacob Keller <jacob.e.keller@...el.com>, netdev@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, kernel@...labora.com
Subject: Re: [PATCH v2 1/2] dt-bindings: net: starfive,jh7110-dwmac: Add
 JH7100 SoC compatible

On 12/22/23 00:21, Rob Herring wrote:
> On Wed, Dec 20, 2023 at 02:28:22AM +0200, Cristian Ciocaltea wrote:
>> The Synopsys DesignWare MAC found on StarFive JH7100 SoC is mostly
>> similar to the newer JH7110, but it requires only two interrupts and a
>> single reset line, which is 'ahb' instead of the commonly used
>> 'stmmaceth'.
>>
>> Since the common binding 'snps,dwmac' allows selecting 'ahb' only in
>> conjunction with 'stmmaceth', extend the logic to also permit exclusive
>> usage of the 'ahb' reset name.  This ensures the following use cases are
>> supported:
>>
>>   JH7110: reset-names = "stmmaceth", "ahb";
>>   JH7100: reset-names = "ahb";
>>   other:  reset-names = "stmmaceth";
>>
>> Also note the need to use a different dwmac fallback, as v5.20 applies
>> to JH7110 only, while JH7100 relies on v3.7x.
>>
>> Additionally, drop the reset description items from top-level binding as
>> they are already provided by the included snps,dwmac schema.
>>
>> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
>> ---
>>  .../devicetree/bindings/net/snps,dwmac.yaml   | 11 ++-
>>  .../bindings/net/starfive,jh7110-dwmac.yaml   | 75 +++++++++++++------
>>  2 files changed, 60 insertions(+), 26 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
>> index 5c2769dc689a..90c4db178c67 100644
>> --- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
>> +++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
>> @@ -95,6 +95,7 @@ properties:
>>          - snps,dwmac-5.20
>>          - snps,dwxgmac
>>          - snps,dwxgmac-2.10
>> +        - starfive,jh7100-dwmac
>>          - starfive,jh7110-dwmac
>>  
>>    reg:
>> @@ -144,10 +145,12 @@ properties:
>>        - description: AHB reset
>>  
>>    reset-names:
>> -    minItems: 1
>> -    items:
>> -      - const: stmmaceth
>> -      - const: ahb
>> +    oneOf:
>> +      - items:
>> +          - enum: [stmmaceth, ahb]
>> +      - items:
>> +          - const: stmmaceth
>> +          - const: ahb
>>  
>>    power-domains:
>>      maxItems: 1
>> diff --git a/Documentation/devicetree/bindings/net/starfive,jh7110-dwmac.yaml b/Documentation/devicetree/bindings/net/starfive,jh7110-dwmac.yaml
>> index 5e7cfbbebce6..f5f0bff5be0f 100644
>> --- a/Documentation/devicetree/bindings/net/starfive,jh7110-dwmac.yaml
>> +++ b/Documentation/devicetree/bindings/net/starfive,jh7110-dwmac.yaml
>> @@ -16,16 +16,20 @@ select:
>>      compatible:
>>        contains:
>>          enum:
>> +          - starfive,jh7100-dwmac
>>            - starfive,jh7110-dwmac
>>    required:
>>      - compatible
>>  
>>  properties:
>>    compatible:
>> -    items:
>> -      - enum:
>> -          - starfive,jh7110-dwmac
>> -      - const: snps,dwmac-5.20
>> +    oneOf:
>> +      - items:
>> +          - const: starfive,jh7100-dwmac
>> +          - const: snps,dwmac
>> +      - items:
>> +          - const: starfive,jh7110-dwmac
>> +          - const: snps,dwmac-5.20
>>  
>>    reg:
>>      maxItems: 1
>> @@ -46,24 +50,6 @@ properties:
>>        - const: tx
>>        - const: gtx
>>  
>> -  interrupts:
>> -    minItems: 3
>> -    maxItems: 3
>> -
>> -  interrupt-names:
>> -    minItems: 3
>> -    maxItems: 3
>> -
>> -  resets:
>> -    items:
>> -      - description: MAC Reset signal.
>> -      - description: AHB Reset signal.
>> -
>> -  reset-names:
>> -    items:
>> -      - const: stmmaceth
>> -      - const: ahb
>> -
>>    starfive,tx-use-rgmii-clk:
>>      description:
>>        Tx clock is provided by external rgmii clock.
>> @@ -94,6 +80,51 @@ required:
>>  allOf:
>>    - $ref: snps,dwmac.yaml#
>>  
>> +  - if:
>> +      properties:
>> +        compatible:
>> +          contains:
>> +            const: starfive,jh7100-dwmac
>> +    then:
>> +      properties:
>> +        interrupts:
>> +          minItems: 2
>> +          maxItems: 2
>> +
>> +        interrupt-names:
>> +          minItems: 2
>> +          maxItems: 2
>> +
>> +        resets:
>> +          maxItems: 1
>> +
>> +        reset-names:
>> +          const: ahb
> 
> Just 'maxItems: 1'

This would allow using either 'ahb' or 'stmmaceth', while only the
former should be permitted.

No issues with the other two optimizations, will be handled in v3.

Thank you for reviewing,
Cristian

>> +
>> +  - if:
>> +      properties:
>> +        compatible:
>> +          contains:
>> +            const: starfive,jh7110-dwmac
>> +    then:
>> +      properties:
>> +        interrupts:
>> +          minItems: 3
>> +          maxItems: 3
>> +
>> +        interrupt-names:
>> +          minItems: 3
>> +          maxItems: 3
>> +
>> +        resets:
>> +          minItems: 2
>> +          maxItems: 2
> 
> max is already 2. Drop.
> 
>> +
>> +        reset-names:
>> +          items:
>> +            - const: stmmaceth
>> +            - const: ahb
> 
> Already defined the names. Just 'minItems: 2'.
> 
>> +
>>  unevaluatedProperties: false
>>  
>>  examples:
>> -- 
>> 2.43.0
>>

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