linux-kernel - Re: [PATCH net-next v2 1/1] net: phy: microchip: lan937x: add support for 100BaseTX PHY

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Message-ID: <457179162ca6fd067b22b3b7733c60c2a17129a5.camel@microchip.com>
Date: Fri, 5 Jul 2024 15:15:36 +0000
From: <Arun.Ramadoss@...rochip.com>
To: <andrew@...n.ch>, <davem@...emloft.net>, <hkallweit1@...il.com>,
	<Yuiko.Oshino@...rochip.com>, <linux@...linux.org.uk>,
	<Woojung.Huh@...rochip.com>, <pabeni@...hat.com>, <o.rempel@...gutronix.de>,
	<edumazet@...gle.com>, <f.fainelli@...il.com>, <kuba@...nel.org>
CC: <michal.kubiak@...el.com>, <kernel@...gutronix.de>,
	<linux-kernel@...r.kernel.org>, <florian.fainelli@...adcom.com>,
	<UNGLinuxDriver@...rochip.com>, <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v2 1/1] net: phy: microchip: lan937x: add support
 for 100BaseTX PHY

Hi Oleksij,
On Fri, 2024-07-05 at 10:55 +0200, Oleksij Rempel wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you
> know the content is safe
> 
> Add support of 100BaseTX PHY build in to LAN9371 and LAN9372
> switches.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>
> Reviewed-by: Michal Kubiak <michal.kubiak@...el.com>
> ---
> changes v2:
> - move LAN937X_TX code from microchip_t1.c to microchip.c
> - add Reviewed-by tags
> ---
>  drivers/net/phy/microchip.c | 75
> +++++++++++++++++++++++++++++++++++++
>  1 file changed, 75 insertions(+)
> 
> diff --git a/drivers/net/phy/microchip.c
> b/drivers/net/phy/microchip.c
> index 0b88635f4fbca..b46d5d43e2585 100644
> --- a/drivers/net/phy/microchip.c
> +++ b/drivers/net/phy/microchip.c
> @@ -12,6 +12,12 @@
>  #include <linux/of.h>
>  #include <dt-bindings/net/microchip-lan78xx.h>
> 
> +#define PHY_ID_LAN937X_TX                      0x0007c190

0x0007c190 -> 0x0007C190

> +
> +#define LAN937X_MODE_CTRL_STATUS_REG           0x11
> +#define LAN937X_AUTOMDIX_EN                    BIT(7)
> +#define LAN937X_MDI_MODE                       BIT(6)
> +
>  #define DRIVER_AUTHOR  "WOOJUNG HUH <woojung.huh@...rochip.com>"
>  #define DRIVER_DESC    "Microchip LAN88XX PHY driver"

nitpick:
It can be updated to include "Microchip LAN88XX/LAN937X TX PHY driver"
> 
> @@ -373,6 +379,66 @@ static void lan88xx_link_change_notify(struct
> phy_device *phydev)
>         }
>  }
> 

Adding function description will be good.

> +static int lan937x_tx_config_mdix(struct phy_device *phydev, u8
> ctrl)
> +{
> +       u16 val;
> +
> +       switch (ctrl) {
> +       case ETH_TP_MDI:
> +               val = 0;
> +               break;
> +       case ETH_TP_MDI_X:
> +               val = LAN937X_MDI_MODE;
> +               break;
> +       case ETH_TP_MDI_AUTO:
> +               val = LAN937X_AUTOMDIX_EN;
> +               break;
> +       default:
> +               return 0;
> +       }
> +
> +       return phy_modify(phydev, LAN937X_MODE_CTRL_STATUS_REG,
> +                         LAN937X_AUTOMDIX_EN | LAN937X_MDI_MODE,
> val);
> +}
> +
> +static int lan937x_tx_config_aneg(struct phy_device *phydev)
> +{
> +       int ret;
> +
> +       ret = genphy_config_aneg(phydev);
> +       if (ret)

Is this if( ret < 0) ?

> +               return ret;
> +
> +       return lan937x_tx_config_mdix(phydev, phydev->mdix_ctrl);

why we need to pass argument phydev->mdix_ctrl, since already phydev is
passed. Also IMO, this two function can be combined together if
lan937x_tx_config_mdix is not used by other functions. 

> +}
> +
>  static struct phy_driver microchip_phy_driver[] = {
>  {
>         .phy_id         = 0x0007c132,
> @@ -400,12 +466,21 @@ static struct phy_driver microchip_phy_driver[]
> = {
>         .set_wol        = lan88xx_set_wol,
>         .read_page      = lan88xx_read_page,
>         .write_page     = lan88xx_write_page,
> +},
> +{
> +       PHY_ID_MATCH_MODEL(PHY_ID_LAN937X_TX),
> +       .name           = "Microchip LAN937x TX",
> +       .suspend        = genphy_suspend,
> +       .resume         = genphy_resume,
> +       .config_aneg    = lan937x_tx_config_aneg,
> +       .read_status    = lan937x_tx_read_status,

Do we need to add genphy_suspend/resume, .features?
>  } };
> 
>  module_phy_driver(microchip_phy_driver);
> 
>  static struct mdio_device_id __maybe_unused microchip_tbl[] = {
>         { 0x0007c132, 0xfffffff2 },
> +       { PHY_ID_MATCH_MODEL(PHY_ID_LAN937X_TX) },
>         { }
>  };
> 
> --
> 2.39.2
>