[PATCH 3/4] net/ftgmac100: Add NC-SI mode support

[Joel Stanley]

On Thu, 6 Jun 2019 at 04:50, Samuel Mendoza-Jonas <sam at mendozajonas.com> wrote:
>
> Update the ftgmac100 driver to support NC-SI instead of an mdio phy
> where available. This is a common setup for Aspeed AST2x00 platforms.
>
> NC-SI mode is determined from the device-tree if either phy-mode sets it
> or the use-ncsi property exists. If set then normal mdio setup is
> skipped in favour of the NC-SI phy.
>
> Signed-off-by: Samuel Mendoza-Jonas <sam at mendozajonas.com>
> ---
>  drivers/net/ftgmac100.c | 39 +++++++++++++++++++++++++++++----------

> @@ -181,7 +183,7 @@ static int ftgmac100_phy_adjust_link(struct ftgmac100_data *priv)
>         struct phy_device *phydev = priv->phydev;
>         u32 maccr;
>
> -       if (!phydev->link) {
> +       if (!phydev->link && !priv->ncsi_mode) {
>                 dev_err(phydev->dev, "No link\n");
>                 return -EREMOTEIO;
>         }
> @@ -217,7 +219,8 @@ static int ftgmac100_phy_init(struct udevice *dev)
>         if (!phydev)
>                 return -ENODEV;
>
> -       phydev->supported &= PHY_GBIT_FEATURES;
> +       if (!priv->ncsi_mode)
> +               phydev->supported &= PHY_GBIT_FEATURES;

Instead of hiding this behind ncsi_mode I was assuming the ncsi "phy"
driver would answer these questions through the phy_read callbacks.

If you don't think that is going to work then this solution isn't too
invasive, and we've been using this in Linux for a while, so we know
it works.