netdev - Re: [PATCH v5 03/12] dt-bindings: net: snps,dwmac: Add an optional resets single 'ahb'

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Message-ID: <aac48eab-5f36-396a-d582-a944cd07c30d@starfivetech.com>
Date:   Thu, 9 Mar 2023 11:10:00 +0800
From:   Guo Samin <samin.guo@...rfivetech.com>
To:     Rob Herring <robh@...nel.org>
CC:     <linux-riscv@...ts.infradead.org>, <netdev@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "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>,
        Emil Renner Berthing <kernel@...il.dk>,
        Richard Cochran <richardcochran@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Peter Geis <pgwipeout@...il.com>,
        Yanhong Wang <yanhong.wang@...rfivetech.com>
Subject: Re: [PATCH v5 03/12] dt-bindings: net: snps,dwmac: Add an optional
 resets single 'ahb'


Re: [PATCH v5 03/12] dt-bindings: net: snps,dwmac: Add an optional resets single 'ahb'
From: Rob Herring <robh@...nel.org>

> On Fri, Mar 03, 2023 at 04:59:19PM +0800, Samin Guo wrote:
>> According to:
>> stmmac_platform.c: stmmac_probe_config_dt
>> stmmac_main.c: stmmac_dvr_probe
> 
> That's not really a reason on its own. Maybe the driver is wrong. Do we 
> know what hardware needs this?
> 
Hi Rob, Starfive JH7110 SOC must have two resets (stmmaceth+ahb), it uses snps,dwmac-5.20 IP.

Best regards,
Samin
>> dwmac controller may require one (stmmaceth) or two (stmmaceth+ahb)
>> reset signals, and the maxItems of resets/reset-names is going to be 2.
>>
>> Signed-off-by: Samin Guo <samin.guo@...rfivetech.com>
>> ---
>>  .../devicetree/bindings/net/snps,dwmac.yaml        | 14 ++++++++++----
>>  1 file changed, 10 insertions(+), 4 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
>> index b4135d5297b4..89099a888f0b 100644
>> --- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
>> +++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
>> @@ -133,12 +133,18 @@ properties:
>>          - ptp_ref
>>  
>>    resets:
>> -    maxItems: 1
>> -    description:
>> -      MAC Reset signal.
>> +    minItems: 1
>> +    items:
>> +      - description: GMAC stmmaceth reset
>> +      - description: AHB reset
>>  
>>    reset-names:
>> -    const: stmmaceth
>> +    minItems: 1
>> +    maxItems: 2
>> +    contains:
> 
> This means 'reset-names = "foo", "ahb";' is valid. You want 'items' 
> instead. However, that still allows the below string in any order. Do we 
> really need that? If not, then you want:
> 
> items:
>   - const: stmmaceth
>   - const: ahb
> 
Thank you for your guidance. It will be better to modify it in this way, I will fix it in next version.

Best regards,
Samin
>> +      enum:
>> +        - stmmaceth
>> +        - ahb
>>  
>>    power-domains:
>>      maxItems: 1
>> -- 
>> 2.17.1
>>