linux-kernel - Re: [PATCH net-next v3 2/2] net: phy: tja11xx: add support for master-slave configuration

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Message-ID: <20200430050344.u7bsakcrrw2cakex@pengutronix.de>
Date:   Thu, 30 Apr 2020 07:03:44 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     "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>,
        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>,
        Christian Herber <christian.herber@....com>
Subject: Re: [PATCH net-next v3 2/2] net: phy: tja11xx: add support for
 master-slave configuration

On Wed, Apr 29, 2020 at 08:20:53PM +0200, Andrew Lunn wrote:
> > +static int tja11xx_config_aneg(struct phy_device *phydev)
> > +{
> > +	u16 ctl = 0;
> > +	int ret;
> > +
> > +	switch (phydev->master_slave_set) {
> > +	case PORT_MODE_CFG_MASTER_FORCE:
> > +	case PORT_MODE_CFG_MASTER_PREFERRED:
> > +		ctl |= MII_CFG1_MASTER_SLAVE;
> > +		break;
> > +	case PORT_MODE_CFG_SLAVE_FORCE:
> > +	case PORT_MODE_CFG_SLAVE_PREFERRED:
> > +		break;
> > +	case PORT_MODE_CFG_UNKNOWN:
> > +		return 0;
> > +	default:
> > +		phydev_warn(phydev, "Unsupported Master/Slave mode\n");
> > +		return -ENOTSUPP;
> > +	}
> 
> Does the hardware actually support PORT_MODE_CFG_SLAVE_PREFERRED and
> PORT_MODE_CFG_MASTER_PREFERRED? I thought that required autoneg, which
> this PHY does not support? So i would of expected these two values to
> return ENOTSUPP?

I do not have strong opinion here. Will change it.

Regards,
Oleksij
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