Subject: Re: [RFC][PATCH 2/2] net: phy: tja11xx: Add BroadRReach Master/Slave support into TJA11xx PHY driver

From: Andrew Lunn <[email-masked]>
Date: Wed, 25 Mar 2020 14:47:03 +0100

> +static int tja11xx_get_tunable(struct phy_device *phydev,
> +			       struct ethtool_tunable *tuna, void *data)
> +{
> +	u8 *mode = (u8 *)data;
> +	int ret;
> +
> +	switch (tuna->id) {
> +	case ETHTOOL_PHY_BRR_MODE:
> +		ret = phy_read(phydev, MII_CFG1);
> +		if (ret < 0)
> +			return ret;
> +		*mode = !!(ret & MII_CFG1_MASTER_SLAVE);

It is not so easy to see if master is 1 or 0?

> +		return 0;
> +	default:
> +		return -EOPNOTSUPP;
> +	}
> +}
> +
> +static int tja11xx_set_tunable(struct phy_device *phydev,
> +			       struct ethtool_tunable *tuna, const void *data)
> +{
> +	u8 mode = *(u8 *)data;
> +	int ret;
> +
> +	switch (tuna->id) {
> +	case ETHTOOL_PHY_BRR_MODE:
> +		ret = tja11xx_disable_link_control(phydev);
> +		if (ret)
> +			return ret;
> +
> +		ret = phy_modify(phydev, MII_CFG1, MII_CFG1_MASTER_SLAVE,
> +				 mode ? MII_CFG1_MASTER_SLAVE : 0);

And if the user passes 42?

    Andrew