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

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Message-ID: <96bc6695-5e9a-4a50-8ea6-c4625806af28@huawei.com>
Date: Tue, 24 Jun 2025 09:06:22 +0800
From: Jijie Shao <shaojijie@...wei.com>
To: Andrew Lunn <andrew@...n.ch>
CC: <shaojijie@...wei.com>, <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 2025/6/23 15:32, Andrew Lunn wrote:
> 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


Thank you for the guidance,
I will study and use it.

Thanks
Jijie Shao