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Date:   Wed, 14 Oct 2020 16:24:09 +0300
From:   Ivan Mikhaylov <i.mikhaylov@...ro.com>
To:     Joel Stanley <joel@....id.au>
CC:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Po-Yu Chuang <ratbert@...aday-tech.com>,
        <netdev@...r.kernel.org>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] net: ftgmac100: add handling of mdio/phy nodes for
 ast2400/2500

On Wed, 2020-10-14 at 05:23 +0000, Joel Stanley wrote:
> Hi Ivan,
> 
> On Tue, 13 Oct 2020 at 12:38, Ivan Mikhaylov <i.mikhaylov@...ro.com> wrote:
> > phy-handle can't be handled well for ast2400/2500 which has an embedded
> > MDIO controller. Add ftgmac100_mdio_setup for ast2400/2500 and initialize
> > PHYs from mdio child node with of_mdiobus_register.
> 
> Good idea. The driver has become a mess of different ways to connect
> the phy and it needs to be cleaned up. I have a patch that fixes
> rmmod, which is currently broken.
> 
> 
> 
> > Signed-off-by: Ivan Mikhaylov <i.mikhaylov@...ro.com>
> > ---
> >  drivers/net/ethernet/faraday/ftgmac100.c | 114 ++++++++++++++---------
> >  1 file changed, 69 insertions(+), 45 deletions(-)
> > 
> > diff --git a/drivers/net/ethernet/faraday/ftgmac100.c
> > b/drivers/net/ethernet/faraday/ftgmac100.c
> > index 87236206366f..e32066519ec1 100644
> > --- a/drivers/net/ethernet/faraday/ftgmac100.c
> > +++ b/drivers/net/ethernet/faraday/ftgmac100.c
> > @@ -1044,11 +1044,47 @@ static void ftgmac100_adjust_link(struct net_device
> > *netdev)
> >         schedule_work(&priv->reset_task);
> >  }
> > 
> > -static int ftgmac100_mii_probe(struct ftgmac100 *priv, phy_interface_t
> > intf)
> > +static int ftgmac100_mii_probe(struct net_device *netdev)
> >  {
> > -       struct net_device *netdev = priv->netdev;
> > +       struct ftgmac100 *priv = netdev_priv(netdev);
> > +       struct platform_device *pdev = to_platform_device(priv->dev);
> > +       struct device_node *np = pdev->dev.of_node;
> > +       phy_interface_t phy_intf = PHY_INTERFACE_MODE_RGMII;
> >         struct phy_device *phydev;
> > 
> > +       /* Get PHY mode from device-tree */
> > +       if (np) {
> > +               /* Default to RGMII. It's a gigabit part after all */
> > +               phy_intf = of_get_phy_mode(np, &phy_intf);
> > +               if (phy_intf < 0)
> > +                       phy_intf = PHY_INTERFACE_MODE_RGMII;
> > +
> > +               /* Aspeed only supports these. I don't know about other IP
> > +                * block vendors so I'm going to just let them through for
> > +                * now. Note that this is only a warning if for some obscure
> > +                * reason the DT really means to lie about it or it's a
> > newer
> > +                * part we don't know about.
> > +                *
> > +                * On the Aspeed SoC there are additionally straps and SCU
> > +                * control bits that could tell us what the interface is
> > +                * (or allow us to configure it while the IP block is held
> > +                * in reset). For now I chose to keep this driver away from
> > +                * those SoC specific bits and assume the device-tree is
> > +                * right and the SCU has been configured properly by pinmux
> > +                * or the firmware.
> > +                */
> > +               if (priv->is_aspeed &&
> > +                   phy_intf != PHY_INTERFACE_MODE_RMII &&
> > +                   phy_intf != PHY_INTERFACE_MODE_RGMII &&
> > +                   phy_intf != PHY_INTERFACE_MODE_RGMII_ID &&
> > +                   phy_intf != PHY_INTERFACE_MODE_RGMII_RXID &&
> > +                   phy_intf != PHY_INTERFACE_MODE_RGMII_TXID) {
> > +                       netdev_warn(netdev,
> > +                                   "Unsupported PHY mode %s !\n",
> > +                                   phy_modes(phy_intf));
> > +               }
> 
> Why do we move this?

I've tried to detach PHY connect from ftgmac100_setup_mdio register function.
Tried to decouple MDIO and PHY levels.

> 
> > +       }
> > +
> >         phydev = phy_find_first(priv->mii_bus);
> >         if (!phydev) {
> >                 netdev_info(netdev, "%s: no PHY found\n", netdev->name);
> > @@ -1056,7 +1092,7 @@ static int ftgmac100_mii_probe(struct ftgmac100 *priv,
> > phy_interface_t intf)
> >         }
> > 
> >         phydev = phy_connect(netdev, phydev_name(phydev),
> > -                            &ftgmac100_adjust_link, intf);
> > +                            &ftgmac100_adjust_link, phy_intf);
> > 
> >         if (IS_ERR(phydev)) {
> >                 netdev_err(netdev, "%s: Could not attach to PHY\n", netdev-
> > >name);
> > @@ -1601,8 +1637,8 @@ static int ftgmac100_setup_mdio(struct net_device
> > *netdev)
> >  {
> >         struct ftgmac100 *priv = netdev_priv(netdev);
> >         struct platform_device *pdev = to_platform_device(priv->dev);
> > -       phy_interface_t phy_intf = PHY_INTERFACE_MODE_RGMII;
> >         struct device_node *np = pdev->dev.of_node;
> > +       struct device_node *mdio_np;
> >         int i, err = 0;
> >         u32 reg;
> > 
> > @@ -1623,39 +1659,6 @@ static int ftgmac100_setup_mdio(struct net_device
> > *netdev)
> >                 iowrite32(reg, priv->base + FTGMAC100_OFFSET_REVR);
> >         }
> > 
> > -       /* Get PHY mode from device-tree */
> > -       if (np) {
> > -               /* Default to RGMII. It's a gigabit part after all */
> > -               err = of_get_phy_mode(np, &phy_intf);
> > -               if (err)
> > -                       phy_intf = PHY_INTERFACE_MODE_RGMII;
> > -
> > -               /* Aspeed only supports these. I don't know about other IP
> > -                * block vendors so I'm going to just let them through for
> > -                * now. Note that this is only a warning if for some obscure
> > -                * reason the DT really means to lie about it or it's a
> > newer
> > -                * part we don't know about.
> > -                *
> > -                * On the Aspeed SoC there are additionally straps and SCU
> > -                * control bits that could tell us what the interface is
> > -                * (or allow us to configure it while the IP block is held
> > -                * in reset). For now I chose to keep this driver away from
> > -                * those SoC specific bits and assume the device-tree is
> > -                * right and the SCU has been configured properly by pinmux
> > -                * or the firmware.
> > -                */
> > -               if (priv->is_aspeed &&
> > -                   phy_intf != PHY_INTERFACE_MODE_RMII &&
> > -                   phy_intf != PHY_INTERFACE_MODE_RGMII &&
> > -                   phy_intf != PHY_INTERFACE_MODE_RGMII_ID &&
> > -                   phy_intf != PHY_INTERFACE_MODE_RGMII_RXID &&
> > -                   phy_intf != PHY_INTERFACE_MODE_RGMII_TXID) {
> > -                       netdev_warn(netdev,
> > -                                  "Unsupported PHY mode %s !\n",
> > -                                  phy_modes(phy_intf));
> > -               }
> > -       }
> > -
> >         priv->mii_bus->name = "ftgmac100_mdio";
> >         snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s-%d",
> >                  pdev->name, pdev->id);
> > @@ -1667,22 +1670,22 @@ static int ftgmac100_setup_mdio(struct net_device
> > *netdev)
> >         for (i = 0; i < PHY_MAX_ADDR; i++)
> >                 priv->mii_bus->irq[i] = PHY_POLL;
> > 
> > -       err = mdiobus_register(priv->mii_bus);
> > +       mdio_np = of_get_child_by_name(np, "mdio");
> > +       if (mdio_np)
> > +               err = of_mdiobus_register(priv->mii_bus, mdio_np);
> > +       else
> > +               err = mdiobus_register(priv->mii_bus);
> > +
> >         if (err) {
> >                 dev_err(priv->dev, "Cannot register MDIO bus!\n");
> >                 goto err_register_mdiobus;
> >         }
> > 
> > -       err = ftgmac100_mii_probe(priv, phy_intf);
> > -       if (err) {
> > -               dev_err(priv->dev, "MII Probe failed!\n");
> > -               goto err_mii_probe;
> > -       }
> > +       if (mdio_np)
> > +               of_node_put(mdio_np);
> 
> By the time I get down here I'm lost. Do you think you could split the
> change up into a few smaller patches?
> 
> If not, try to explain what the various hunks of your change are trying to do.
> 

Yes, you're right, I see two patches for now from your comments:
1. phy connect detach from ftgmac100_setup_mdio
2. add ast2400/2500 phy-handle support

Thanks.

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