netdev - Re: [PATCH net-next 12/13] net: dsa: sja1105: expose the SGMII PCS as an mdio

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Date:   Tue, 25 May 2021 04:33:33 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Russell King <linux@...linux.org.uk>
Subject: Re: [PATCH net-next 12/13] net: dsa: sja1105: expose the SGMII PCS
 as an mdio_device

> +static int sja1105_mdiobus_pcs_register(struct sja1105_private *priv)
> +{
> +	struct sja1105_mdio_private *mdio_priv;
> +	struct dsa_switch *ds = priv->ds;
> +	struct mii_bus *bus;
> +	int rc = 0;
> +	int port;
> +
> +	if (!priv->info->pcs_mdio_read || !priv->info->pcs_mdio_write)
> +		return 0;
> +
> +	bus = mdiobus_alloc_size(sizeof(*mdio_priv));
> +	if (!bus)
> +		return -ENOMEM;
> +
> +	bus->name = "SJA1105 PCS MDIO bus";
> +	snprintf(bus->id, MII_BUS_ID_SIZE, "%s-pcs",
> +		 dev_name(ds->dev));
> +	bus->read = priv->info->pcs_mdio_read;
> +	bus->write = priv->info->pcs_mdio_write;
> +	bus->parent = ds->dev;
> +	mdio_priv = bus->priv;
> +	mdio_priv->priv = priv;
> +
> +	/* We don't register this MDIO bus because there is no PHY on it */

Interesting. If you don't register it, you miss out on the stats in
/sysfs. I wonder if it makes more sense to set phy_mask to stop it
probing for PHYs and register it?

	Andrew