RE: [PATCH v2 net-next 2/3] net: phy: tja11xx: replace "nxp,rmii-refclk-in" with "nxp,phy-output-refclk"

[Wei Fang]

> -----Original Message-----
> From: Conor Dooley <conor@xxxxxxxxxx>
> Sent: 2024年8月22日 16:47
> To: Wei Fang <wei.fang@xxxxxxx>
> Cc: davem@xxxxxxxxxxxxx; edumazet@xxxxxxxxxx; kuba@xxxxxxxxxx;
> pabeni@xxxxxxxxxx; robh@xxxxxxxxxx; krzk+dt@xxxxxxxxxx;
> conor+dt@xxxxxxxxxx; andrew@xxxxxxx; f.fainelli@xxxxxxxxx;
> hkallweit1@xxxxxxxxx; linux@xxxxxxxxxxxxxxx; Andrei Botila (OSS)
> <andrei.botila@xxxxxxxxxxx>; netdev@xxxxxxxxxxxxxxx;
> devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH v2 net-next 2/3] net: phy: tja11xx: replace
> "nxp,rmii-refclk-in" with "nxp,phy-output-refclk"
> 
> On Thu, Aug 22, 2024 at 09:37:20AM +0800, Wei Fang wrote:
> > As the new property "nxp,phy-output-refclk" is added to instead of the
> > "nxp,rmii-refclk-in" property, so replace the "nxp,rmii-refclk-in"
> > property used in the driver with the "nxp,reverse-mode" property and
> > make slight modifications.
> 
> Can you explain what makes this backwards compatible please?
> 
It does not backward compatible, the related PHY nodes in DTS also
need to be updated. I have not seen "nxp,rmii-refclk-in" used in the
upstream. For nodes that do not use " nxp,rmii-refclk-in", they need
to be updated, but unfortunately I cannot confirm which DTS use
TJA11XX PHY, and there may be no relevant nodes in upstream DTS.

> >
> > Signed-off-by: Wei Fang <wei.fang@xxxxxxx>
> > ---
> > V2 changes:
> > 1. Changed the property name.
> > ---
> >  drivers/net/phy/nxp-tja11xx.c | 13 ++++++-------
> >  1 file changed, 6 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/net/phy/nxp-tja11xx.c
> > b/drivers/net/phy/nxp-tja11xx.c index 2c263ae44b4f..7aa0599c38c3
> > 100644
> > --- a/drivers/net/phy/nxp-tja11xx.c
> > +++ b/drivers/net/phy/nxp-tja11xx.c
> > @@ -78,8 +78,7 @@
> >  #define MII_COMMCFG			27
> >  #define MII_COMMCFG_AUTO_OP		BIT(15)
> >
> > -/* Configure REF_CLK as input in RMII mode */
> > -#define TJA110X_RMII_MODE_REFCLK_IN       BIT(0)
> > +#define TJA11XX_REVERSE_MODE		BIT(0)
> >
> >  struct tja11xx_priv {
> >  	char		*hwmon_name;
> > @@ -274,10 +273,10 @@ static int tja11xx_get_interface_mode(struct
> phy_device *phydev)
> >  		mii_mode = MII_CFG1_REVMII_MODE;
> >  		break;
> >  	case PHY_INTERFACE_MODE_RMII:
> > -		if (priv->flags & TJA110X_RMII_MODE_REFCLK_IN)
> > -			mii_mode = MII_CFG1_RMII_MODE_REFCLK_IN;
> > -		else
> > +		if (priv->flags & TJA11XX_REVERSE_MODE)
> >  			mii_mode = MII_CFG1_RMII_MODE_REFCLK_OUT;
> > +		else
> > +			mii_mode = MII_CFG1_RMII_MODE_REFCLK_IN;
> >  		break;
> >  	default:
> >  		return -EINVAL;
> > @@ -517,8 +516,8 @@ static int tja11xx_parse_dt(struct phy_device
> *phydev)
> >  	if (!IS_ENABLED(CONFIG_OF_MDIO))
> >  		return 0;
> >
> > -	if (of_property_read_bool(node, "nxp,rmii-refclk-in"))
> > -		priv->flags |= TJA110X_RMII_MODE_REFCLK_IN;
> > +	if (of_property_read_bool(node, "nxp,phy-output-refclk"))
> > +		priv->flags |= TJA11XX_REVERSE_MODE;
> >
> >  	return 0;
> >  }
> > --
> > 2.34.1
> >