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Message-ID: <52dab677-6ec9-4ae2-803f-1a2a34c32007@linux.dev>
Date: Tue, 14 Jan 2025 18:29:47 +0800
From: Yanteng Si <si.yanteng@...ux.dev>
To: Paul Menzel <pmenzel@...gen.mpg.de>, Andrew Lunn <andrew@...n.ch>
Cc: Joey Lu <a0987203069@...il.com>, 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,
 mcoquelin.stm32@...il.com, richardcochran@...il.com,
 devicetree@...r.kernel.org, ychuang3@...oton.com, netdev@...r.kernel.org,
 openbmc@...ts.ozlabs.org, alexandre.torgue@...s.st.com,
 linux-kernel@...r.kernel.org, joabreu@...opsys.com, schung@...oton.com,
 peppe.cavallaro@...com, yclu4@...oton.com,
 linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH net-next v7 3/3] net: stmmac: dwmac-nuvoton: Add dwmac
 glue for Nuvoton MA35 family

在 2025/1/14 10:21, Paul Menzel 写道:
> Dear Andrew,
> 
> 
> Thank you for your quick reply.
> 
> 
> Am 14.01.25 um 21:16 schrieb Andrew Lunn:
>>>> +#define NVT_MISCR_RMII          BIT(0)
>>>> +
>>>> +/* 2000ps is mapped to 0x0 ~ 0xF */
>>>
>>> Excuse my ignorance: What is ps?
>>
>> picoseconds. An RGMII link needs a 2ns delay between the clock line
>> and the data lines. Some MACs allow you to tune the delay they can
>> insert, in this case in steps of 2ns / 16.
> 
> Thank you for the clarification. Maybe it’s my English, but I didn’t 
> deduce this from how the comment is worded. I do not have a better idea 
> either.

Hmmm, how about:

2000 ps is xxxx

I checked the kernel code and it looks like
folks usually put a space between the number
and the unit.

I looked into the rules of a bunch of publishers
again. It seems like there's a rule about putting
a space between a number and a unit, but when the
unit is a symbol, that's an exception:

space:

10 kg
10 ℃
10 h

no space:

22°36′48″N, 114°10′10″E


Thanks,
Yanteng

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