linux-kernel - Re: [PATCH net-next v6 6/6] dsa: lan9303: Migrate to PHYLINK

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Message-ID: <39a76c164362f5e03238666e194fc135b19ade12.camel@microchip.com>
Date:   Thu, 12 Jan 2023 05:22:57 +0000
From:   <Arun.Ramadoss@...rochip.com>
To:     <olteanv@...il.com>, <andrew@...n.ch>,
        <linux-kernel@...r.kernel.org>, <linux@...linux.org.uk>,
        <Jerry.Ray@...rochip.com>, <f.fainelli@...il.com>,
        <kuba@...nel.org>, <edumazet@...gle.com>, <pabeni@...hat.com>,
        <jbe@...gutronix.de>, <netdev@...r.kernel.org>,
        <davem@...emloft.net>
Subject: Re: [PATCH net-next v6 6/6] dsa: lan9303: Migrate to PHYLINK

Hi Jerry,
On Mon, 2023-01-09 at 15:18 -0600, Jerry Ray wrote:
> 
> diff --git a/drivers/net/dsa/lan9303-core.c
> b/drivers/net/dsa/lan9303-core.c
> index 7be4c491e5d9..e514fff81af6 100644
> --- a/drivers/net/dsa/lan9303-core.c
> +++ b/drivers/net/dsa/lan9303-core.c
> @@ -1058,37 +1058,6 @@ static int lan9303_phy_write(struct dsa_switch
> *ds, int phy, int regnum,
>  	return chip->ops->phy_write(chip, phy, regnum, val);
>  }
>    
> +static void lan9303_phylink_get_caps(struct dsa_switch *ds, int
> port,
> +				     struct phylink_config *config)
> +{
> +	struct lan9303 *chip = ds->priv;
> +
> +	dev_dbg(chip->dev, "%s(%d) entered.", __func__, port);
> +
> +	config->mac_capabilities = MAC_10 | MAC_100 | MAC_ASYM_PAUSE |
> +				   MAC_SYM_PAUSE;
> +
> +	if (port == 0) {
> +		__set_bit(PHY_INTERFACE_MODE_RMII,
> +			  config->supported_interfaces);
> +		__set_bit(PHY_INTERFACE_MODE_MII,
> +			  config->supported_interfaces);
> +	} else {
> +		__set_bit(PHY_INTERFACE_MODE_INTERNAL,
> +			  config->supported_interfaces);
> +		/* Compatibility for phylib's default interface type
> when the
> +		 * phy-mode property is absent
> +		 */
> +		__set_bit(PHY_INTERFACE_MODE_GMII,
> +			  config->supported_interfaces);
> +	}
> +
> +	/* This driver does not make use of the speed, duplex, pause or
> the
> +	 * advertisement in its mac_config, so it is safe to mark this
> driver
> +	 * as non-legacy.
> +	 */
> +	config->legacy_pre_march2020 = false;
> +}
> +
> +static void lan9303_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)
> +{
> +	u32 ctl;
> +
> +	/* On this device, we are only interested in doing something
> here if
> +	 * this is the xMII port. All other ports are 10/100 phys using
> MDIO
> +	 * to control there link settings.
> +	 */
> +	if (port != 0)
> +		return;
> +
> +	ctl = lan9303_phy_read(ds, port, MII_BMCR);
> +
> +	ctl &= ~BMCR_ANENABLE;
> +
> +	if (speed == SPEED_100)
> +		ctl |= BMCR_SPEED100;
> +	else if (speed == SPEED_10)
> +		ctl &= ~BMCR_SPEED100;
> +	else
> +		dev_err(ds->dev, "unsupported speed: %d\n", speed);

I think, We will not reach in the error part, since in the
phylink_get_caps we specified only 10 and 100 Mbps speed. Phylink layer
will validate and if the value is beyond the speed supported, it will 
return back.

> +
> +	if (duplex == DUPLEX_FULL)
> +		ctl |= BMCR_FULLDPLX;
> +	else
> +		ctl &= ~BMCR_FULLDPLX;
> +
> +	lan9303_phy_write(ds, port, MII_BMCR, ctl);
> +}
> +
>