From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH] net/phy/vitesse: Configure RGMII skew on VSC8601, if
 needed
Date: Mon, 14 Nov 2016 16:18:18 -0500 (EST)
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From: Alexandru Gagniuc <alex.g@adaptrum.com>
Date: Sat, 12 Nov 2016 15:32:13 -0800

> +	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
> +		ret = vsc8601_add_skew(phydev);

I think you should use phy_interface_is_rgmii() here.