linux-kernel - Re: [RFC PATCH 02/10] net: ti: prueth: Adds ICSSM Ethernet driver

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Message-ID: <5ba6bbf2-52e4-49d0-b6e2-134fb25ebe4c@lunn.ch>
Date: Thu, 9 Jan 2025 16:59:46 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Basharath Hussain Khaja <basharath@...thit.com>
Cc: danishanwar@...com, rogerq@...nel.org, andrew+netdev@...n.ch,
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Subject: Re: [RFC PATCH 02/10] net: ti: prueth: Adds ICSSM Ethernet driver

> +	emac->phy_node = of_parse_phandle(eth_node, "phy-handle", 0);
> +	if (!emac->phy_node) {
> +		dev_err(prueth->dev, "couldn't find phy-handle\n");
> +		ret = -ENODEV;
> +		goto free;
> +	}
> +
> +	ret = of_get_phy_mode(eth_node, &emac->phy_if);
> +	if (ret) {
> +		dev_err(prueth->dev, "could not get phy-mode property err %d\n",
> +			ret);
> +		goto free;
> +	}
> +
> +	/* connect PHY */
> +	emac->phydev = of_phy_connect(ndev, emac->phy_node,
> +				      &icssm_emac_adjust_link, 0, emac->phy_if);
> +	if (!emac->phydev) {
> +		dev_dbg(prueth->dev, "couldn't connect to phy %s\n",
> +			emac->phy_node->full_name);
> +		ret = -EPROBE_DEFER;
> +		goto free;
> +	}

of_phy_get_and_connect() will simplify this.

> +	/* remove unsupported modes */
> +	phy_remove_link_mode(emac->phydev, ETHTOOL_LINK_MODE_10baseT_Half_BIT);
> +	phy_remove_link_mode(emac->phydev, ETHTOOL_LINK_MODE_10baseT_Full_BIT);

It only does 100Mbps?

> +	if (of_property_read_bool(eth_node, "ti,no-half-duplex")) {

Is this becasue 100baseT_Half is broken in some versions of the
hardware?

> +		phy_remove_link_mode(emac->phydev,
> +				     ETHTOOL_LINK_MODE_100baseT_Half_BIT);
> +	}
> +
> +	phy_remove_link_mode(emac->phydev, ETHTOOL_LINK_MODE_Pause_BIT);
> +	phy_remove_link_mode(emac->phydev, ETHTOOL_LINK_MODE_Asym_Pause_BIT);

Is this really needed? I've not checked, but if you don't call
phy_support_sym_pause() or phy_support_asym_pause(), i would of
expected phylib to default to no pause?

> +static const struct of_device_id prueth_dt_match[];

Please avoid forward references. If you need the match table, define
it here.

	Andrew