linux-kernel - Re: [PATCH net-next 2/4] net: phy: motorcomm: Support YT8531S PHY in YT6801 Ethernet controller

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Message-ID: <aO6Dk0rK0nobGClc@shell.armlinux.org.uk>
Date: Tue, 14 Oct 2025 18:08:35 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Yao Zi <ziyao@...root.org>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Frank <Frank.Sae@...or-comm.com>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Vladimir Oltean <vladimir.oltean@....com>,
	Choong Yong Liang <yong.liang.choong@...ux.intel.com>,
	Chen-Yu Tsai <wens@...e.org>, Jisheng Zhang <jszhang@...nel.org>,
	Furong Xu <0x1207@...il.com>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH net-next 2/4] net: phy: motorcomm: Support YT8531S PHY in
 YT6801 Ethernet controller

On Tue, Oct 14, 2025 at 04:47:45PM +0000, Yao Zi wrote:
> YT6801's internal PHY is confirmed as a GMII-capable variant of YT8531S
> by a previous series[1] and reading PHY ID. Add support for
> PHY_INTERFACE_MODE_INTERNAL for YT8531S to allow the Ethernet driver to
> reuse the PHY code for its internal PHY.

If it's known to be connected via a GMII interface, even if it's on the
SoC, please use PHY_INTERFACE_MODE_GMII in preference to
PHY_INTERFACE_MODE_INTERNAL. PHY_INTERFACE_MODE_INTERNAL is really for
"we don't know what the internal interface is".

Thanks.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!