linux-kernel - Re: [PATCH v7 net-next 06/10] net: dsa: microchip: add support for phylink management

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Message-ID: <Yf1tHUaecq2DLgcE@shell.armlinux.org.uk>
Date:   Fri, 4 Feb 2022 18:14:53 +0000
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Prasanna Vengateshan <prasanna.vengateshan@...rochip.com>
Cc:     andrew@...n.ch, netdev@...r.kernel.org, olteanv@...il.com,
        robh+dt@...nel.org, UNGLinuxDriver@...rochip.com,
        Woojung.Huh@...rochip.com, hkallweit1@...il.com,
        davem@...emloft.net, kuba@...nel.org, linux-kernel@...r.kernel.org,
        vivien.didelot@...il.com, f.fainelli@...il.com,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v7 net-next 06/10] net: dsa: microchip: add support for
 phylink management

Hi,

On Fri, Feb 04, 2022 at 11:14:56PM +0530, Prasanna Vengateshan wrote:
> +static void lan937x_phylink_mac_link_up(struct dsa_switch *ds, int port,
> +					unsigned int mode,
> +					phy_interface_t interface,
> +					struct phy_device *phydev,
> +					int speed, int duplex,
> +					bool tx_pause, bool rx_pause)
> +{
> +	struct ksz_device *dev = ds->priv;
> +
> +	/* Internal PHYs */
> +	if (lan937x_is_internal_phy_port(dev, port))
> +		return;
> +
> +	if (phylink_autoneg_inband(mode)) {
> +		dev_err(ds->dev, "In-band AN not supported!\n");
> +		return;
> +	}

No need to check this in the link_up() method - if this were true,
you've already printed an error in the mac_config() method and this
one doesn't provide any additional useful information.

> +
> +	lan937x_config_interface(dev, port, speed, duplex,
> +				 tx_pause, rx_pause);
> +}
> +
> +static void lan937x_phylink_get_caps(struct dsa_switch *ds, int port,
> +				     struct phylink_config *config)
> +{
> +	struct ksz_device *dev = ds->priv;
> +
> +	config->mac_capabilities = MAC_100FD;
> +
> +	/* internal T1 PHY */
> +	if (lan937x_is_internal_base_t1_phy_port(dev, port)) {
> +		__set_bit(PHY_INTERFACE_MODE_INTERNAL,
> +			  config->supported_interfaces);
> +	} else {
> +		/* MII/RMII/RGMII ports */
> +		if (!lan937x_is_internal_base_tx_phy_port(dev, port)) {

Please consider:

	} else if (!lan937x_is_internal_base_tx_phy_port(dev, port)) {
		/* MII/RMII/RGMII ports */
		...
	}

to avoid needing two tabs to indent, which probably makes:

> +			config->mac_capabilities |= MAC_100HD | MAC_SYM_PAUSE |
> +						    MAC_ASYM_PAUSE | MAC_10 |
> +						    MAC_1000FD;

able to be laid out with the two pause modes first followed by the
speeds.

> +			phy_interface_set_rgmii(config->supported_interfaces);
> +
> +			__set_bit(PHY_INTERFACE_MODE_MII,
> +				  config->supported_interfaces);
> +			__set_bit(PHY_INTERFACE_MODE_RMII,
> +				  config->supported_interfaces);
> +		}
> +	}

You seem to be a non-legacy driver in this patch (good!) so please also
add:

	config->legacy_pre_march2020 = false;

while DSA is transitioned over. Thanks.

> +}
> +
>  const struct dsa_switch_ops lan937x_switch_ops = {
>  	.get_tag_protocol = lan937x_get_tag_protocol,
>  	.setup = lan937x_setup,

Thanks.

-- 
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