linux-kernel - Re: [net-next 3/4] dt-bindings: net: ftgmac100: add rgmii delay properties

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Message-ID: <6f862344-b6c1-4c9b-a6d6-bb0e6655d16e@kernel.org>
Date: Mon, 17 Mar 2025 14:21:35 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Andrew Lunn <andrew@...n.ch>, Jacky Chou <jacky_chou@...eedtech.com>,
 Kevin Chen <kevin_chen@...eedtech.com>, Ryan Chen <ryan_chen@...eedtech.com>
Cc: andrew+netdev@...n.ch, davem@...emloft.net, edumazet@...gle.com,
 kuba@...nel.org, pabeni@...hat.com, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, joel@....id.au, andrew@...econstruct.com.au,
 ratbert@...aday-tech.com, netdev@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-aspeed@...ts.ozlabs.org,
 BMC-SW@...eedtech.com
Subject: Re: [net-next 3/4] dt-bindings: net: ftgmac100: add rgmii delay
 properties

On 17/03/2025 13:44, Andrew Lunn wrote:
>> diff --git a/Documentation/devicetree/bindings/net/faraday,ftgmac100.yaml b/Documentation/devicetree/bindings/net/faraday,ftgmac100.yaml
>> index 55d6a8379025..c5904aa84e05 100644
>> --- a/Documentation/devicetree/bindings/net/faraday,ftgmac100.yaml
>> +++ b/Documentation/devicetree/bindings/net/faraday,ftgmac100.yaml
>> @@ -66,6 +66,20 @@ properties:
>>      type: boolean
>>      deprecated: true
>>  
>> +  rx-internal-delay-ps:
>> +    description:
>> +       Setting this property to a non-zero number sets the RX internal delay
>> +       for the MAC. Use this property value as a index not a ps unit to
>> +       configure the corresponding delay register field. And the index range is
>> +       0 to 63.
> 
> You have to use picoseconds here. As with all DT binding, you use SI
> units, and the driver then converts them to whatever value you need to
> poke into the register.
Ykes, I did notice that when skimming through the patch. Such a sneaky
way to pretend you conform to the bindings but eh, not really, I will do
it my way.

I think reviewing Aspeed code takes a lot, a lot of our time. It's not
only about this patchset but several others.

Maybe it is time for Aspeed to perform intensive internal review, before
they post to the mailing lists? Several other companies do it, more or less.

Best regards,
Krzysztof