netdev - Re: [PATCH v4 2/2] net: ti: icssg-prueth: Add ICSSG ethernet driver

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Date:   Mon, 6 Feb 2023 15:15:21 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     MD Danish Anwar <danishanwar@...com>
Cc:     "Andrew F. Davis" <afd@...com>, Suman Anna <s-anna@...com>,
        Roger Quadros <rogerq@...nel.org>,
        YueHaibing <yuehaibing@...wei.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>, nm@...com,
        ssantosh@...nel.org, srk@...com, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, netdev@...r.kernel.org,
        linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 2/2] net: ti: icssg-prueth: Add ICSSG ethernet driver

> +enum mii_mode {
> +	MII_MODE_MII = 0,
> +	MII_MODE_RGMII,
> +	MII_MODE_SGMII

There is no mention of SGMII anywhere else. And in a couple of places,
the code makes the assumption that if it is not RGMII it is MII.

Does the hardware really support SGMII?

> +static int prueth_config_rgmiidelay(struct prueth *prueth,
> +				    struct device_node *eth_np,
> +				    phy_interface_t phy_if)
> +{

...

> +	if (phy_if == PHY_INTERFACE_MODE_RGMII_ID ||
> +	    phy_if == PHY_INTERFACE_MODE_RGMII_TXID)
> +		rgmii_tx_id |= ICSSG_CTRL_RGMII_ID_MODE;
> +
> +	regmap_update_bits(ctrl_mmr, icssgctrl_reg, ICSSG_CTRL_RGMII_ID_MODE, rgmii_tx_id);

Here you are adding the TX delay if the phy-mode indicates it should
be added.

> +static int prueth_netdev_init(struct prueth *prueth,
> +			      struct device_node *eth_node)
> +{

> +	ret = of_get_phy_mode(eth_node, &emac->phy_if);
> +	if (ret) {
> +		dev_err(prueth->dev, "could not get phy-mode property\n");
> +		goto free;
> +	}

> +	ret = prueth_config_rgmiidelay(prueth, eth_node, emac->phy_if);
> +	if (ret)
> +		goto free;
> +

Reading it from DT and calling the delay function.

> +static int prueth_probe(struct platform_device *pdev)
> +{


> +	/* register the network devices */
> +	if (eth0_node) {
> +		ret = register_netdev(prueth->emac[PRUETH_MAC0]->ndev);
> +		if (ret) {
> +			dev_err(dev, "can't register netdev for port MII0");
> +			goto netdev_exit;
> +		}
> +
> +		prueth->registered_netdevs[PRUETH_MAC0] = prueth->emac[PRUETH_MAC0]->ndev;
> +
> +		emac_phy_connect(prueth->emac[PRUETH_MAC0]);

And this is connecting the MAC and the PHY, where emac_phy_connect()
passes emac->phy_if to phylib.

What i don't see anywhere is you changing emac->phy_if to indicate the
MAC has inserted the TX delay, and so the PHY should not.

    Andrew