Date: Fri, 24 Mar 2017 15:02:15 +0100
From: Andrew Lunn <andrew@lunn.ch>
To: sean.wang@mediatek.com
Cc: f.fainelli@gmail.com, vivien.didelot@savoirfairelinux.com,
        matthias.bgg@gmail.com, robh+dt@kernel.org, mark.rutland@arm.com,
        devicetree@vger.kernel.org, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org,
        davem@davemloft.net, Landen.Chao@mediatek.com, keyhaede@gmail.com,
        objelf@gmail.com
Subject: Re: [PATCH net-next v2 5/5] net-next: dsa: add dsa support for
 Mediatek MT7530 switch
Message-ID: <20170324140215.GG28518@lunn.ch>
References: <1490088910-19405-1-git-send-email-sean.wang@mediatek.com>
 <1490088910-19405-6-git-send-email-sean.wang@mediatek.com>
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Hi Sean

> +	regmap = devm_regmap_init(ds->dev, NULL, priv,
> +				  &mt7530_regmap_config);
> +	if (IS_ERR(regmap))
> +		dev_warn(priv->dev, "phy regmap initialization failed");
> +

Shouldn't this be a fatal error? If you keep going when there is an
error, what happens when you actually try to use the regmap?

> +	phy_mode = of_get_phy_mode(ds->ports[ds->dst->cpu_port].dn);
> +	if (phy_mode < 0) {
> +		dev_err(priv->dev, "Can't find phy-mode for master device\n");
> +		return phy_mode;
> +	}
> +	dev_info(priv->dev, "phy-mode for master device = %x\n", phy_mode);

dev_dbg? 

> +
> +	id = mt7530_read(priv, MT7530_CREV);
> +	id >>= CHIP_NAME_SHIFT;
> +	if (id != MT7530_ID)
> +		return -ENODEV;

It might be helpful to say what ID has been found, if it is not the
supported ID.

	Andrew