netdev - Re: [PATCH net] phy: mscc: Fix PTP for vsc8574 and VSC8572

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Message-ID: <64e2cf5f-b2e5-43b9-aea9-a937f6ec1508@redhat.com>
Date: Tue, 16 Sep 2025 15:32:36 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: Horatiu Vultur <horatiu.vultur@...rochip.com>, andrew@...n.ch,
 hkallweit1@...il.com, linux@...linux.org.uk, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, richardcochran@...il.com,
 vladimir.oltean@....com, vadim.fedorenko@...ux.dev, rosenp@...il.com,
 rmk+kernel@...linux.org.uk, christophe.jaillet@...adoo.fr,
 steen.hegelund@...rochip.com
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] phy: mscc: Fix PTP for vsc8574 and VSC8572

On 9/15/25 10:01 AM, Horatiu Vultur wrote:
> When trying to enable PTP on vsc8574 and vsc8572 it is not working even
> if the function vsc8584_ptp_init it says that it has support for PHY
> timestamping. It is not working because there is no PTP device.
> So, to fix this make sure to create a PTP device also for this PHYs as
> they have the same PTP IP as the other vsc PHYs.

[...]

> diff --git a/drivers/net/phy/mscc/mscc_main.c b/drivers/net/phy/mscc/mscc_main.c
> index ef0ef1570d392..89b5cd96e8720 100644
> --- a/drivers/net/phy/mscc/mscc_main.c
> +++ b/drivers/net/phy/mscc/mscc_main.c
> @@ -2259,6 +2259,7 @@ static int vsc8574_probe(struct phy_device *phydev)
>  	u32 default_mode[4] = {VSC8531_LINK_1000_ACTIVITY,
>  	   VSC8531_LINK_100_ACTIVITY, VSC8531_LINK_ACTIVITY,
>  	   VSC8531_DUPLEX_COLLISION};
> +	int ret;
>  
>  	vsc8531 = devm_kzalloc(&phydev->mdio.dev, sizeof(*vsc8531), GFP_KERNEL);
>  	if (!vsc8531)

vsc8574_probe() is also used by 8504 and 8552, is the side effect intended?

/P