netdev - Re: [PATCH 05/16] net: phy: adin: configure RGMII/RMII/MII modes on config

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Date:   Tue, 6 Aug 2019 06:43:50 +0000
From:   "Ardelean, Alexandru" <alexandru.Ardelean@...log.com>
To:     "andrew@...n.ch" <andrew@...n.ch>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>
Subject: Re: [PATCH 05/16] net: phy: adin: configure RGMII/RMII/MII modes on
 config

On Mon, 2019-08-05 at 16:39 +0200, Andrew Lunn wrote:
> [External]
> 
> On Mon, Aug 05, 2019 at 07:54:42PM +0300, Alexandru Ardelean wrote:
> > The ADIN1300 chip supports RGMII, RMII & MII modes. Default (if
> > unconfigured) is RGMII.
> > This change adds support for configuring these modes via the device
> > registers.
> > 
> > For RGMII with internal delays (modes RGMII_ID,RGMII_TXID, RGMII_RXID),
> 
> It would be nice to add the missing space.
> 
> > the default delay is 2 ns. This can be configurable and will be done in
> > a subsequent change.
> > 
> > Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
> > ---
> >  drivers/net/phy/adin.c | 79 +++++++++++++++++++++++++++++++++++++++++-
> >  1 file changed, 78 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/net/phy/adin.c b/drivers/net/phy/adin.c
> > index 3dd9fe50f4c8..dbdb8f60741c 100644
> > --- a/drivers/net/phy/adin.c
> > +++ b/drivers/net/phy/adin.c
> > @@ -33,14 +33,91 @@
> >  	 ADIN1300_INT_HW_IRQ_EN)
> >  #define ADIN1300_INT_STATUS_REG			0x0019
> >  
> > +#define ADIN1300_GE_RGMII_CFG_REG		0xff23
> > +#define   ADIN1300_GE_RGMII_RXID_EN		BIT(2)
> > +#define   ADIN1300_GE_RGMII_TXID_EN		BIT(1)
> > +#define   ADIN1300_GE_RGMII_EN			BIT(0)
> > +
> > +#define ADIN1300_GE_RMII_CFG_REG		0xff24
> > +#define   ADIN1300_GE_RMII_EN			BIT(0)
> > +
> > +static int adin_config_rgmii_mode(struct phy_device *phydev,
> > +				  phy_interface_t intf)
> > +{
> > +	int reg;
> > +
> > +	reg = phy_read_mmd(phydev, MDIO_MMD_VEND1, ADIN1300_GE_RGMII_CFG_REG);
> > +	if (reg < 0)
> > +		return reg;
> > +
> > +	if (!phy_interface_mode_is_rgmii(intf)) {
> > +		reg &= ~ADIN1300_GE_RGMII_EN;
> > +		goto write;
> > +	}
> > +
> > +	reg |= ADIN1300_GE_RGMII_EN;
> > +
> > +	if (intf == PHY_INTERFACE_MODE_RGMII_ID ||
> > +	    intf == PHY_INTERFACE_MODE_RGMII_RXID) {
> > +		reg |= ADIN1300_GE_RGMII_RXID_EN;
> > +	} else {
> > +		reg &= ~ADIN1300_GE_RGMII_RXID_EN;
> > +	}
> > +
> > +	if (intf == PHY_INTERFACE_MODE_RGMII_ID ||
> > +	    intf == PHY_INTERFACE_MODE_RGMII_TXID) {
> > +		reg |= ADIN1300_GE_RGMII_TXID_EN;
> > +	} else {
> > +		reg &= ~ADIN1300_GE_RGMII_TXID_EN;
> > +	}
> 
> Nice. Often driver writers forget to clear the delay, they only set
> it. Not so here.
> 
> However, is checkpatch happy with this? Each half of the if/else is a
> single statement, so the {} are not needed.

it did not complain;
this whole series is checkpatch friendly [with the version of checkpatch in net-next]
i think it complained about un-balanced if-block; something like:

```
if () {

} else
  single-statement
```

but checkpatch is also a moving target;
so ¯\_(ツ)_/¯

> 
> > +
> > +write:
> > +	return phy_write_mmd(phydev, MDIO_MMD_VEND1,
> > +			     ADIN1300_GE_RGMII_CFG_REG, reg);
> > +}
> > +
> > +static int adin_config_rmii_mode(struct phy_device *phydev,
> > +				 phy_interface_t intf)
> > +{
> > +	int reg;
> > +
> > +	reg = phy_read_mmd(phydev, MDIO_MMD_VEND1, ADIN1300_GE_RMII_CFG_REG);
> > +	if (reg < 0)
> > +		return reg;
> > +
> > +	if (intf != PHY_INTERFACE_MODE_RMII) {
> > +		reg &= ~ADIN1300_GE_RMII_EN;
> > +		goto write;
> 
> goto? Really?

yep;
personally, i used to not like it all that much up until a few years, but sometimes it feels it can help with creating
cleaner patches in certain contexts;

i'll re-spin without it;

> 
> > +	}
> > +
> > +	reg |= ADIN1300_GE_RMII_EN;
> > +
> > +write:
> > +	return phy_write_mmd(phydev, MDIO_MMD_VEND1,
> > +			     ADIN1300_GE_RMII_CFG_REG, reg);
> > +}
> > +
> >  static int adin_config_init(struct phy_device *phydev)
> >  {
> > -	int rc;
> > +	phy_interface_t interface, rc;
> 
> genphy_config_init() does not return a phy_interface_t!

good point;
will check;

> 
> >  
> >  	rc = genphy_config_init(phydev);
> >  	if (rc < 0)
> >  		return rc;
> >  
> > +	interface = phydev->interface;
> > +
> > +	rc = adin_config_rgmii_mode(phydev, interface);
> > +	if (rc < 0)
> > +		return rc;
> > +
> > +	rc = adin_config_rmii_mode(phydev, interface);
> > +	if (rc < 0)
> > +		return rc;
> > +
> > +	dev_info(&phydev->mdio.dev, "PHY is using mode '%s'\n",
> > +		 phy_modes(phydev->interface));
> 
> phydev_dbg(), or not at all.

ack

> 
> 	      Andrew