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

[Conor Dooley <conor@kernel.org>]

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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?

> 
> Signed-off-by: Wei Fang <wei.fang@nxp.com>
> ---
> 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
> 

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