linux-kernel - AW: [PATCH net-next v4 04/15] net: phy: dp83822: Add support for phy

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Message-ID:
 <DB8P192MB08386B9F0FB342EB7B0FA785F3F92@DB8P192MB0838.EURP192.PROD.OUTLOOK.COM>
Date: Sat, 15 Feb 2025 11:31:28 +0000
From: "Fedrau Dimitri (LED)" <Dimitri.Fedrau@...bherr.com>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>,
        "davem@...emloft.net"
	<davem@...emloft.net>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "thomas.petazzoni@...tlin.com" <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"
	<linux-arm-kernel@...ts.infradead.org>,
        Christophe Leroy
	<christophe.leroy@...roup.eu>,
        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" <mwojtas@...omium.org>,
        Antoine Tenart
	<atenart@...nel.org>,
        "devicetree@...r.kernel.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>,
        Sean
 Anderson <seanga2@...il.com>,
        "dima.fedrau@...il.com" <dima.fedrau@...il.com>
Subject: AW: [PATCH net-next v4 04/15] net: phy: dp83822: Add support for
 phy_port representation

Hi Maxime,

> -----Ursprüngliche Nachricht-----
> Von: Maxime Chevallier <maxime.chevallier@...tlin.com> 
> Gesendet: Donnerstag, 13. Februar 2025 11:16
>
[...]
>  
> @@ -781,17 +782,6 @@ static int dp83822_of_init(struct phy_device *phydev)
>  	struct device *dev = &phydev->mdio.dev;
>  	const char *of_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.
> -	 */
Does it make sense to keep the comment ?

> -	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;
> @@ -884,6 +874,43 @@ static int dp83822_read_straps(struct phy_device *phydev)
>  	return 0;
>  }
>  
> +static int dp83822_attach_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) ||
> +		    port->mediums & BIT(ETHTOOL_LINK_MEDIUM_BASEX))
> +			dp83822->fx_enabled = true;
> +	} else {
> +		ret = dp83822_read_straps(phydev);
> +		if (ret)
> +			return ret;
> +
> +#ifdef CONFIG_OF_MDIO
> +		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");
> +#endif

I think this is to make it backwards compatible to the dp83822 bindings,
is it worth mentioning this in a comment ?

> +
> +		if (dp83822->fx_enabled) {
> +			port->lanes = 1;
> +			port->mediums = BIT(ETHTOOL_LINK_MEDIUM_BASEF) |
> +					BIT(ETHTOOL_LINK_MEDIUM_BASEX);
> +		} 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;
> @@ -900,25 +927,13 @@ 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;
> +	dp83822_of_init(phydev);

Keep the check of the return value.

>  
>  	return 0;
>  }
> @@ -1104,6 +1119,7 @@ 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_port = dp83822_attach_port		\
>  	}
>  
>  #define DP83825_PHY_DRIVER(_id, _name)				\
> -- 
> 2.48.1

Best regards,
Dimitri Fedrau