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Date:   Tue, 10 Dec 2019 17:44:38 +0100
From:   Andrew Lunn <andrew@lunn.ch>
To:     Landen Chao <landen.chao@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, sean.wang@mediatek.com, opensource@vdorst.com,
        frank-w@public-files.de
Subject: Re: [PATCH net-next 4/6] net: dsa: mt7530: Add the support of MT7531
 switch
Message-ID: <20191210164438.GD27714@lunn.ch>
References: <cover.1575914275.git.landen.chao@mediatek.com>
 <6d608dd024edc90b09ba4fe35417b693847f973c.1575914275.git.landen.chao@mediatek.com>
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> +static int
> +mt7531_ind_mmd_phy_read(struct mt7530_priv *priv, int port, int devad,
> +			int regnum)
> +{
> +	struct mii_bus *bus = priv->bus;
> +	struct mt7530_dummy_poll p;
> +	u32 reg, val;
> +	int ret;
> +
> +	INIT_MT7530_DUMMY_POLL(&p, priv, MT7531_PHY_IAC);
> +
> +	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
> +
> +	ret = readx_poll_timeout(_mt7530_unlocked_read, &p, val,
> +				 !(val & PHY_ACS_ST), 20, 100000);
> +	if (ret < 0) {
> +		dev_err(priv->dev, "poll timeout\n");
> +		goto out;
> +	}
> +
> +	reg = MDIO_CL45_ADDR | MDIO_PHY_ADDR(port) | MDIO_DEV_ADDR(devad) |
> +	      regnum;

It might be better to call this mt7531_ind_c45_phy_read()

> +static int
> +mt7531_ind_phy_read(struct dsa_switch *ds, int port, int regnum)
> +{
> +	struct mt7530_priv *priv = ds->priv;
> +	struct mii_bus *bus = priv->bus;
> +	struct mt7530_dummy_poll p;
> +	int ret;
> +	u32 val;
> +
> +	INIT_MT7530_DUMMY_POLL(&p, priv, MT7531_PHY_IAC);
> +
> +	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
> +
> +	ret = readx_poll_timeout(_mt7530_unlocked_read, &p, val,
> +				 !(val & PHY_ACS_ST), 20, 100000);
> +	if (ret < 0) {
> +		dev_err(priv->dev, "poll timeout\n");
> +		goto out;
> +	}
> +
> +	val = MDIO_CL22_READ | MDIO_PHY_ADDR(port) | MDIO_REG_ADDR(regnum);

This is then mt7531_ind_c22_phy_read().

And then you can add a wrapper around this to provide

mt7531_phy_read() which can do both C22 and C45.

> +	[ID_MT7531] = {
> +		.id = ID_MT7531,
> +		.setup = mt7531_setup,
> +		.phy_read = mt7531_ind_phy_read,

and use it here.

  Andrew