linux-kernel - Re: Re: Re: Re: Re: Re: Re: [PATCH v3 2/2] ethernet: eswin: Add eic7700 ethernet driver

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Message-ID: <1935a8ad.648.198cfcfdcb1.Coremail.lizhi2@eswincomputing.com>
Date: Fri, 22 Aug 2025 11:26:02 +0800 (GMT+08:00)
From: 李志 <lizhi2@...incomputing.com>
To: "Andrew Lunn" <andrew@...n.ch>
Cc: weishangjuan@...incomputing.com, andrew+netdev@...n.ch,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
	netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, mcoquelin.stm32@...il.com,
	alexandre.torgue@...s.st.com, rmk+kernel@...linux.org.uk,
	yong.liang.choong@...ux.intel.com, vladimir.oltean@....com,
	jszhang@...nel.org, jan.petrous@....nxp.com,
	prabhakar.mahadev-lad.rj@...renesas.com, inochiama@...il.com,
	boon.khai.ng@...era.com, dfustini@...storrent.com, 0x1207@...il.com,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, ningyu@...incomputing.com,
	linmin@...incomputing.com, pinkesh.vaghela@...fochips.com
Subject: Re: Re: Re: Re: Re: Re: Re: [PATCH v3 2/2] ethernet: eswin: Add
 eic7700 ethernet driver

Dear Andrew Lunn,
Thank you for your valuable and professional suggestions.
Please find our explanations embedded below your comments in the
original email.

Best regards,

Li Zhi
Eswin Computing


> -----原始邮件-----
> 发件人: "Andrew Lunn" <andrew@...n.ch>
> 发送时间:2025-08-22 11:17:37 (星期五)
> 收件人: 李志 <lizhi2@...incomputing.com>
> 抄送: weishangjuan@...incomputing.com, andrew+netdev@...n.ch, davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org, netdev@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, mcoquelin.stm32@...il.com, alexandre.torgue@...s.st.com, rmk+kernel@...linux.org.uk, yong.liang.choong@...ux.intel.com, vladimir.oltean@....com, jszhang@...nel.org, jan.petrous@....nxp.com, prabhakar.mahadev-lad.rj@...renesas.com, inochiama@...il.com, boon.khai.ng@...era.com, dfustini@...storrent.com, 0x1207@...il.com, linux-stm32@...md-mailman.stormreply.com, linux-arm-kernel@...ts.infradead.org, ningyu@...incomputing.com, linmin@...incomputing.com, pinkesh.vaghela@...fochips.com
> 主题: Re: Re: Re: Re: Re: Re: [PATCH v3 2/2] ethernet: eswin: Add eic7700 ethernet driver
> 
> > We re-tuned and verified that setting the TXD and RXD delays to 0 and
> > configuring TXEN and RXDV to 0 yielded the same hardware performance as
> > long as we only applied delays (e.g. 200ps) to TXCLK and RXCLK.
> 
> This is in addition to phy-mode = 'rgmii-id'?
> 

Yes, our re-tuning and verification were performed with phy-mode set to
rgmii-id.

> > Therefore, in the next patch, we will drop the vendor-specific properties
> > (e.g. eswin,dly-param-*) and keep only the standard attributes, namely
> > rx-internal-delay-ps and tx-internal-delay-ps.
> > Is this correct?
> 
> Yes, 200ps is a small tuning value, when the PHY adds the 2ns. This is
> O.K.
> 
> 	Andrew