linux-kernel - Re: [PATCH v2 net-next 1/3] net: hibmcge: support scenario without PHY.

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Message-ID: <51a9e27a-8a67-4188-8875-8cd81e34765a@lunn.ch>
Date: Mon, 23 Jun 2025 09:32:29 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Jijie Shao <shaojijie@...wei.com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, andrew+netdev@...n.ch, horms@...nel.org,
	shenjian15@...wei.com, wangpeiyang1@...wei.com,
	liuyonglong@...wei.com, chenhao418@...wei.com,
	jonathan.cameron@...wei.com, shameerali.kolothum.thodi@...wei.com,
	salil.mehta@...wei.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 net-next 1/3] net: hibmcge: support scenario without
 PHY.

On Mon, Jun 23, 2025 at 11:41:27AM +0800, Jijie Shao wrote:
> Currently, the driver uses phylib to operate PHY by default.
> 
> On some boards, the PHY device is separated from the MAC device.
> As a result, the hibmcge driver cannot operate the PHY device.
> 
> In this patch, the driver determines whether a PHY is available
> based on register configuration. If no PHY is available,
> the driver intercepts phylib operations and operates only MAC device.


The standard way to handle a MAC without a PHY is to use
fixed_link. It is a fake PHY which follows the usual API, so your MAC
driver does not need to care there is no PHY.


    Andrew

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pw-bot: cr