linux-kernel - Re: [PATCH net-next v1 2/2] net: phy: Add support for the DP83TG720S Ethernet PHY

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Message-ID: <cfd4f8bd-a06a-4489-8304-e9576151dbce@lunn.ch>
Date:   Mon, 11 Dec 2023 16:21:41 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v1 2/2] net: phy: Add support for the DP83TG720S
 Ethernet PHY

On Fri, Dec 08, 2023 at 04:11:59PM +0100, Oleksij Rempel wrote:
> The DP83TG720S-Q1 device is an IEEE 802.3bp and Open Alliance compliant
> automotive Ethernet physical layer transceiver.
> 
> This driver was tested with i.MX8MP EQOS (stmmac) on the MAC side and
> TI same PHY on other side.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
>  drivers/net/phy/Kconfig     |  13 +++
>  drivers/net/phy/Makefile    |   1 +
>  drivers/net/phy/dp83tg720.c | 190 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 204 insertions(+)
>  create mode 100644 drivers/net/phy/dp83tg720.c
> 
> diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
> index 25cfc5ded1da..bab10c796f24 100644
> --- a/drivers/net/phy/Kconfig
> +++ b/drivers/net/phy/Kconfig
> @@ -372,6 +372,19 @@ config DP83TC811_PHY
>  	help
>  	  Supports the DP83TC811 PHY.
>  
> +config DP83TG720_PHY
> +	tristate "Texas Instruments DP83TG720 Ethernet 1000Base-T1 PHY"
> +	help
> +	  The DP83TG720S-Q1 is an automotive Ethernet physical layer
> +	  transceiver compliant with IEEE 802.3bp and Open Alliance
> +	  standards. It supports key functions necessary for
> +	  transmitting and receiving data over both unshielded and
> +	  shielded single twisted-pair cables. This device offers
> +	  flexible xMII interface options, including support for both
> +	  RGMII and SGMII MAC interfaces. It's suitable for applications
> +	  requiring high-speed data transmission in automotive
> +	  networking environments.
> +
>  config DP83848_PHY
>  	tristate "Texas Instruments DP83848 PHY"
>  	help
> diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
> index f65e85c91fc1..defaef190962 100644
> --- a/drivers/net/phy/Makefile
> +++ b/drivers/net/phy/Makefile
> @@ -56,6 +56,7 @@ obj-$(CONFIG_DP83848_PHY)	+= dp83848.o
>  obj-$(CONFIG_DP83867_PHY)	+= dp83867.o
>  obj-$(CONFIG_DP83869_PHY)	+= dp83869.o
>  obj-$(CONFIG_DP83TC811_PHY)	+= dp83tc811.o
> +obj-$(CONFIG_DP83TG720_PHY)	+= dp83tg720.o
>  obj-$(CONFIG_DP83TD510_PHY)	+= dp83td510.o

Maybe it should come after CONFIG_DP83TD510_PHY in a strict sort ? I
also wounder about the Kconfig, which should be sorted on the tristate
string.

>  obj-$(CONFIG_FIXED_PHY)		+= fixed_phy.o
>  obj-$(CONFIG_ICPLUS_PHY)	+= icplus.o
> +		/* After HW reset we need to restore master/slave configuration.
> +		 */
> +		if (phydev->drv->config_aneg) {

This test is a bit strange. You know it exists, its this driver and
the function is there. Why not call it directly?

> +			ret = phydev->drv->config_aneg(phydev);
> +			if (ret)
> +				return ret;
> +		}


    Andrew

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