linux-kernel - Re: [PATCH net-next v12 05/18] net: phy: dp83822: Add support for phy

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Message-ID: <2b3f5f44-0629-4fc0-a70a-dc949a3edc0c@csgroup.eu>
Date: Wed, 17 Sep 2025 08:59:50 +0200
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>, davem@...emloft.net
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, thomas.petazzoni@...tlin.com,
 Andrew Lunn <andrew@...n.ch>, Jakub Kicinski <kuba@...nel.org>,
 Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
 Russell King <linux@...linux.org.uk>, linux-arm-kernel@...ts.infradead.org,
 Herve Codina <herve.codina@...tlin.com>,
 Florian Fainelli <f.fainelli@...il.com>,
 Heiner Kallweit <hkallweit1@...il.com>,
 Vladimir Oltean <vladimir.oltean@....com>,
 Köry Maincent <kory.maincent@...tlin.com>,
 Marek Behún <kabel@...nel.org>,
 Oleksij Rempel <o.rempel@...gutronix.de>,
 Nicolò Veronese <nicveronese@...il.com>,
 Simon Horman <horms@...nel.org>, mwojtas@...omium.org,
 Antoine Tenart <atenart@...nel.org>, devicetree@...r.kernel.org,
 Conor Dooley <conor+dt@...nel.org>, Krzysztof Kozlowski
 <krzk+dt@...nel.org>, Rob Herring <robh@...nel.org>,
 Romain Gantois <romain.gantois@...tlin.com>,
 Daniel Golle <daniel@...rotopia.org>,
 Dimitri Fedrau <dimitri.fedrau@...bherr.com>
Subject: Re: [PATCH net-next v12 05/18] net: phy: dp83822: Add support for
 phy_port representation



Le 09/09/2025 à 17:26, Maxime Chevallier a écrit :
> With the phy_port representation introduced, we can use .attach_port to
> populate the port information based on either the straps or the
> ti,fiber-mode property. This allows simplifying the probe function and
> allow users to override the strapping configuration.
> 
> Signed-off-by: Maxime Chevallier <maxime.chevallier@...tlin.com>

Reviewed-by: Christophe Leroy <christophe.leroy@...roup.eu>

> ---
>   drivers/net/phy/dp83822.c | 72 +++++++++++++++++++++++++--------------
>   1 file changed, 46 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/net/phy/dp83822.c b/drivers/net/phy/dp83822.c
> index 33db21251f2e..c6e5b7244658 100644
> --- a/drivers/net/phy/dp83822.c
> +++ b/drivers/net/phy/dp83822.c
> @@ -11,6 +11,7 @@
>   #include <linux/module.h>
>   #include <linux/of.h>
>   #include <linux/phy.h>
> +#include <linux/phy_port.h>
>   #include <linux/netdevice.h>
>   #include <linux/bitfield.h>
>   
> @@ -811,17 +812,6 @@ static int dp83822_of_init(struct phy_device *phydev)
>   	int i, ret;
>   	u32 val;
>   
> -	/* Signal detection for the PHY is only enabled if the FX_EN and the
> -	 * SD_EN pins are strapped. Signal detection can only enabled if FX_EN
> -	 * is strapped otherwise signal detection is disabled for the PHY.
> -	 */
> -	if (dp83822->fx_enabled && dp83822->fx_sd_enable)
> -		dp83822->fx_signal_det_low = device_property_present(dev,
> -								     "ti,link-loss-low");
> -	if (!dp83822->fx_enabled)
> -		dp83822->fx_enabled = device_property_present(dev,
> -							      "ti,fiber-mode");
> -
>   	if (!device_property_read_string(dev, "ti,gpio2-clk-out", &of_val)) {
>   		if (strcmp(of_val, "mac-if") == 0) {
>   			dp83822->gpio2_clk_out = DP83822_CLK_SRC_MAC_IF;
> @@ -950,6 +940,49 @@ static int dp83822_read_straps(struct phy_device *phydev)
>   	return 0;
>   }
>   
> +static int dp83822_attach_mdi_port(struct phy_device *phydev,
> +				   struct phy_port *port)
> +{
> +	struct dp83822_private *dp83822 = phydev->priv;
> +	int ret;
> +
> +	if (port->mediums) {
> +		if (phy_port_is_fiber(port))
> +			dp83822->fx_enabled = true;
> +	} else {
> +		ret = dp83822_read_straps(phydev);
> +		if (ret)
> +			return ret;
> +
> +#if IS_ENABLED(CONFIG_OF_MDIO)
> +		if (dp83822->fx_enabled && dp83822->fx_sd_enable)
> +			dp83822->fx_signal_det_low =
> +				device_property_present(&phydev->mdio.dev,
> +							"ti,link-loss-low");
> +
> +		/* ti,fiber-mode is still used for backwards compatibility, but
> +		 * has been replaced with the mdi node definition, see
> +		 * ethernet-port.yaml
> +		 */
> +		if (!dp83822->fx_enabled)
> +			dp83822->fx_enabled =
> +				device_property_present(&phydev->mdio.dev,
> +							"ti,fiber-mode");
> +#endif /* CONFIG_OF_MDIO */
> +
> +		if (dp83822->fx_enabled) {
> +			port->lanes = 1;
> +			port->mediums = BIT(ETHTOOL_LINK_MEDIUM_BASEF);
> +		} else {
> +			/* This PHY can only to 100BaseTX max, so on 2 lanes */
> +			port->lanes = 2;
> +			port->mediums = BIT(ETHTOOL_LINK_MEDIUM_BASET);
> +		}
> +	}
> +
> +	return 0;
> +}
> +
>   static int dp8382x_probe(struct phy_device *phydev)
>   {
>   	struct dp83822_private *dp83822;
> @@ -968,27 +1001,13 @@ static int dp8382x_probe(struct phy_device *phydev)
>   
>   static int dp83822_probe(struct phy_device *phydev)
>   {
> -	struct dp83822_private *dp83822;
>   	int ret;
>   
>   	ret = dp8382x_probe(phydev);
>   	if (ret)
>   		return ret;
>   
> -	dp83822 = phydev->priv;
> -
> -	ret = dp83822_read_straps(phydev);
> -	if (ret)
> -		return ret;
> -
> -	ret = dp83822_of_init(phydev);
> -	if (ret)
> -		return ret;
> -
> -	if (dp83822->fx_enabled)
> -		phydev->port = PORT_FIBRE;
> -
> -	return 0;
> +	return dp83822_of_init(phydev);
>   }
>   
>   static int dp83826_probe(struct phy_device *phydev)
> @@ -1172,6 +1191,7 @@ static int dp83822_led_hw_control_get(struct phy_device *phydev, u8 index,
>   		.led_hw_is_supported = dp83822_led_hw_is_supported,	\
>   		.led_hw_control_set = dp83822_led_hw_control_set,	\
>   		.led_hw_control_get = dp83822_led_hw_control_get,	\
> +		.attach_mdi_port = dp83822_attach_mdi_port		\
>   	}
>   
>   #define DP83825_PHY_DRIVER(_id, _name)				\