netdev - Re: [PATCH v1] net: phy: tja11xx: add support for master-slave configuration

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Date:   Wed, 15 Apr 2020 14:56:10 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Andrew Lunn <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Michal Kubecek <mkubecek@...e.cz>
Cc:     David Jander <david@...tonic.nl>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Russell King <linux@...linux.org.uk>, mkl@...gutronix.de,
        Marek Vasut <marex@...x.de>
Subject: Re: [PATCH v1] net: phy: tja11xx: add support for master-slave
 configuration

This is the followup patch to the:
ethtool: provide UAPI for PHY master/slave configuration.

On Wed, Apr 15, 2020 at 02:34:47PM +0200, Oleksij Rempel wrote:
> The TJA11xx PHYs have a vendor specific Master/Slave configuration bit,
> which is not compatible with IEEE 803.2-2018 spec for 100Base-T1
> devices. So, provide a custom config_ange call back to solve this
> problem.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
>  drivers/net/phy/nxp-tja11xx.c | 39 +++++++++++++++++++++++++++++++++++
>  1 file changed, 39 insertions(+)
> 
> diff --git a/drivers/net/phy/nxp-tja11xx.c b/drivers/net/phy/nxp-tja11xx.c
> index 2bde9386baf1f..0042ee453cbd4 100644
> --- a/drivers/net/phy/nxp-tja11xx.c
> +++ b/drivers/net/phy/nxp-tja11xx.c
> @@ -30,6 +30,7 @@
>  #define MII_ECTRL_WAKE_REQUEST		BIT(0)
>  
>  #define MII_CFG1			18
> +#define MII_CFG1_MASTER_SLAVE		BIT(15)
>  #define MII_CFG1_AUTO_OP		BIT(14)
>  #define MII_CFG1_SLEEP_CONFIRM		BIT(6)
>  #define MII_CFG1_LED_MODE_MASK		GENMASK(5, 4)
> @@ -177,6 +178,31 @@ static int tja11xx_soft_reset(struct phy_device *phydev)
>  	return genphy_soft_reset(phydev);
>  }
>  
> +static int tja11xx_config_aneg(struct phy_device *phydev)
> +{
> +	u16 ctl = 0;
> +	int ret;
> +
> +	switch (phydev->master_slave) {
> +	case PORT_MODE_MASTER:
> +		ctl |= MII_CFG1_MASTER_SLAVE;
> +		break;
> +	case PORT_MODE_SLAVE:
> +		break;
> +	case PORT_MODE_UNKNOWN:
> +		return 0;
> +	default:
> +		phydev_warn(phydev, "Unsupported Master/Slave mode\n");
> +		return -ENOTSUPP;
> +	}
> +
> +	ret = phy_modify_changed(phydev, MII_CFG1, MII_CFG1_MASTER_SLAVE, ctl);
> +	if (ret < 0)
> +		return ret;
> +
> +	return __genphy_config_aneg(phydev, ret);
> +}
> +
>  static int tja11xx_config_init(struct phy_device *phydev)
>  {
>  	int ret;
> @@ -245,6 +271,15 @@ static int tja11xx_read_status(struct phy_device *phydev)
>  
>  		if (!(ret & MII_COMMSTAT_LINK_UP))
>  			phydev->link = 0;
> +
> +		ret = phy_read(phydev, MII_CFG1);
> +		if (ret < 0)
> +			return ret;
> +
> +		if (ret & MII_CFG1_MASTER_SLAVE)
> +			phydev->master_slave = PORT_MODE_MASTER;
> +		else
> +			phydev->master_slave = PORT_MODE_SLAVE;
>  	}
>  
>  	return 0;
> @@ -514,6 +549,7 @@ static struct phy_driver tja11xx_driver[] = {
>  		.features       = PHY_BASIC_T1_FEATURES,
>  		.probe		= tja11xx_probe,
>  		.soft_reset	= tja11xx_soft_reset,
> +		.config_aneg	= tja11xx_config_aneg,
>  		.config_init	= tja11xx_config_init,
>  		.read_status	= tja11xx_read_status,
>  		.suspend	= genphy_suspend,
> @@ -529,6 +565,7 @@ static struct phy_driver tja11xx_driver[] = {
>  		.features       = PHY_BASIC_T1_FEATURES,
>  		.probe		= tja11xx_probe,
>  		.soft_reset	= tja11xx_soft_reset,
> +		.config_aneg	= tja11xx_config_aneg,
>  		.config_init	= tja11xx_config_init,
>  		.read_status	= tja11xx_read_status,
>  		.suspend	= genphy_suspend,
> @@ -543,6 +580,7 @@ static struct phy_driver tja11xx_driver[] = {
>  		.features       = PHY_BASIC_T1_FEATURES,
>  		.probe		= tja1102_p0_probe,
>  		.soft_reset	= tja11xx_soft_reset,
> +		.config_aneg	= tja11xx_config_aneg,
>  		.config_init	= tja11xx_config_init,
>  		.read_status	= tja11xx_read_status,
>  		.match_phy_device = tja1102_p0_match_phy_device,
> @@ -561,6 +599,7 @@ static struct phy_driver tja11xx_driver[] = {
>  		.features       = PHY_BASIC_T1_FEATURES,
>  		/* currently no probe for Port 1 is need */
>  		.soft_reset	= tja11xx_soft_reset,
> +		.config_aneg	= tja11xx_config_aneg,
>  		.config_init	= tja11xx_config_init,
>  		.read_status	= tja11xx_read_status,
>  		.match_phy_device = tja1102_p1_match_phy_device,
> -- 
> 2.26.0.rc2
> 
> 

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