linux-kernel - Re: [PATCH net-next 4/6] net: dsa: mt7530: Add the support of MT7531 switch

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Message-ID: <1576088280.23763.73.camel@mtksdccf07>
Date:   Thu, 12 Dec 2019 02:18:00 +0800
From:   Landen Chao <landen.chao@...iatek.com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "vivien.didelot@...oirfairelinux.com" 
        <vivien.didelot@...oirfairelinux.com>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Sean Wang <Sean.Wang@...iatek.com>,
        "opensource@...rst.com" <opensource@...rst.com>,
        "frank-w@...lic-files.de" <frank-w@...lic-files.de>
Subject: Re: [PATCH net-next 4/6] net: dsa: mt7530: Add the support of
 MT7531 switch

On Wed, 2019-12-11 at 00:44 +0800, Andrew Lunn wrote:
> > +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.
I'll update the code base on above suggestion.
> 
> > +	[ID_MT7531] = {
> > +		.id = ID_MT7531,
> > +		.setup = mt7531_setup,
> > +		.phy_read = mt7531_ind_phy_read,
> 
> and use it here.
Do you also hint at using the same number of parameters for
mt7531_ind_c22_phy_read() and mt7531_ind_c45_phy_read()?

Landen
> 
>   Andrew