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 14:25:01 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Sky Huang <SkyLake.Huang@...iatek.com>
Cc: 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>,
	Daniel Golle <daniel@...rotopia.org>,
	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 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;

Thanks.

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