netdev - Re: [PATCH net-next v6 5/5] net: phy: add driver for built-in 2.5G ethernet PHY on MT7988

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Date: Mon, 3 Jun 2024 14:41:44 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Daniel Golle <daniel@...rotopia.org>
Cc: Sky Huang <SkyLake.Huang@...iatek.com>, Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Qingfang Deng <dqfext@...il.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	Steven Liu <Steven.Liu@...iatek.com>
Subject: Re: [PATCH net-next v6 5/5] net: phy: add driver for built-in 2.5G
 ethernet PHY on MT7988

On Mon, Jun 03, 2024 at 02:31:46PM +0100, Daniel Golle wrote:
> On Mon, Jun 03, 2024 at 02:25:01PM +0100, Russell King (Oracle) wrote:
> > On Mon, Jun 03, 2024 at 08:18:34PM +0800, Sky Huang wrote:
> > > Add support for internal 2.5Gphy on MT7988. This driver will load
> > > necessary firmware, add appropriate time delay and figure out LED.
> > > Also, certain control registers will be set to fix link-up issues.
> > 
> > Based on our previous discussion, it may be worth checking in the
> > .config_init() method whether phydev->interface is one of the
> > PHY interface modes that this PHY supports. As I understand from one
> > of your previous emails, the possibilities are XGMII, USXGMII or
> > INTERNAL. Thus:
> > 
> > > +static int mt798x_2p5ge_phy_config_init(struct phy_device *phydev)
> > > +{
> > > +	struct pinctrl *pinctrl;
> > > +	int ret;
> > 
> > 	/* Check that the PHY interface type is compatible */
> > 	if (phydev->interface != PHY_INTERFACE_MODE_INTERNAL &&
> > 	    phydev->interface != PHY_INTERFACE_MODE_XGMII &&
> > 	    phydev->interface != PHY_INTERFACE_MODE_USXGMII)
> > 		return -ENODEV;
> 
> The PHY is built-into the SoC, and as such the connection type should
> always be "internal". The PHY does not exist as dedicated IC, only
> as built-in part of the MT7988 SoC.

That's not how it was described to me by Sky.

If what you say is correct, then the implementation of
mt798x_2p5ge_phy_get_rate_matching() which checks for interface modes
other than INTERNAL is not correct. Also it means that config_init()
should not permit anything but INTERNAL.

Thanks.

-- 
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