netdev - Re: [PATCH RFC net-next 5/5] net: dsa: mt7530: Add mediatek,ephy-handle to isolate external phy

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Date:   Mon, 24 Jun 2019 23:52:48 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     René van Dorst <opensource@...rst.com>
Cc:     sean.wang@...iatek.com, f.fainelli@...il.com,
        linux@...linux.org.uk, davem@...emloft.net, matthias.bgg@...il.com,
        vivien.didelot@...il.com, frank-w@...lic-files.de,
        netdev@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-mips@...r.kernel.org
Subject: Re: [PATCH RFC net-next 5/5] net: dsa: mt7530: Add
 mediatek,ephy-handle to isolate external phy

> +static int mt7530_isolate_ephy(struct dsa_switch *ds,
> +			       struct device_node *ephy_node)
> +{
> +	struct phy_device *phydev = of_phy_find_device(ephy_node);
> +	int ret;
> +
> +	if (!phydev)
> +		return 0;
> +
> +	ret = phy_modify(phydev, MII_BMCR, 0, (BMCR_ISOLATE | BMCR_PDOWN));

genphy_suspend() does what you want.

> +	if (ret)
> +		dev_err(ds->dev, "Failed to put phy %s in isolation mode!\n",
> +			ephy_node->full_name);
> +	else
> +		dev_info(ds->dev, "Phy %s in isolation mode!\n",
> +			 ephy_node->full_name);

No need to clog up the system with yet more kernel messages.

   Andrew