linux-kernel - 回覆: 回覆: [net-next 2/4] ARM: dts: ast2600-evb: add default RGMII delay

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Message-ID:
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Date: Thu, 20 Mar 2025 08:02:52 +0000
From: Jacky Chou <jacky_chou@...eedtech.com>
To: Andrew Lunn <andrew@...n.ch>
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Subject:
 回覆: 回覆: [net-next 2/4] ARM: dts: ast2600-evb: add default RGMII delay

Hi Andrew,


> DT describes the board. Does the board add the 2ns delay via extra long clock
> lines? If yes, use rgmii. If the MAC/PHY pair need to add the 2ns delay, use
> rgmii-id.
> 
> If the MAC/PHY pair is adding the delay, the DT says nothing about how they
> add the delay.
> 
> The general rule is the PHY adds the delay. If you look at drivers/net/phy/*.c,
> every PHY that implements RGMII support both
> PHY_INTERFACE_MODE_RGMII_ID and PHY_INTERFACE_MODE_RGMII. There
> is no reason not to follow ever other MAC/PHY pair and have the PHY add the
> delay. The MAC can then do fine tuning if needed, adding small delays.

Thank you for your reply and information.
We will discuss internal and modify in next version.

Thanks,
Jacky