[PATCH v1 09/10] net: mvpp2: allow MDIO registration for fixed links

[Ramon Fried <rfried.dev@gmail.com>]

On Tue, Apr 27, 2021 at 4:29 PM Stefan Roese <sr@denx.de> wrote:
>
> From: Stefan Chulski <stefanc@marvell.com>
>
> Currently, there are 2 valid cases for interface, PHY
> and mdio relation:
>   - If an interface has PHY handler, it'll call
>     mdio_mii_bus_get_from_phy(), which will register
>     MDIO bus.
>   - If we want to use fixed-link for an interface,
>     PHY handle is not defined in the DTS, and no
>     MDIO is registered.
>
> There is a third case, for some boards (with switch),
> the MDIO is used for switch configuration, but the interface
> itself uses fixed link. This patch allows this option by
> checking if fixed-link subnode is defined, in this case,
> MDIO bus is registers, but the PHY address is set to
> PHY_MAX_ADDR for this interface, so this interface will
> not try to access the PHY later on.
>
> Signed-off-by: Stefan Chulski <stefanc@marvell.com>
> Signed-off-by: Stefan Roese <sr@denx.de>
> ---
>
>  drivers/net/mvpp2.c | 17 +++++++++++++----
>  1 file changed, 13 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/mvpp2.c b/drivers/net/mvpp2.c
> index 3d920e85ffef..c5bfe41281d6 100644
> --- a/drivers/net/mvpp2.c
> +++ b/drivers/net/mvpp2.c
> @@ -4787,16 +4787,25 @@ static int phy_info_parse(struct udevice *dev, struct mvpp2_port *port)
>         u32 id;
>         u32 phyaddr = 0;
>         int phy_mode = -1;
> +       int fixed_link = 0;
>         int ret;
>
>         phy_node = fdtdec_lookup_phandle(gd->fdt_blob, port_node, "phy");
> +       fixed_link = fdt_subnode_offset(gd->fdt_blob, port_node, "fixed-link");
>
>         if (phy_node > 0) {
>                 int parent;
> -               phyaddr = fdtdec_get_int(gd->fdt_blob, phy_node, "reg", 0);
> -               if (phyaddr < 0) {
> -                       dev_err(dev, "could not find phy address\n");
> -                       return -1;
> +
> +               if (fixed_link != -FDT_ERR_NOTFOUND) {
> +                       /* phy_addr is set to invalid value for fixed links */
> +                       phyaddr = PHY_MAX_ADDR;
> +               } else {
> +                       phyaddr = fdtdec_get_int(gd->fdt_blob, phy_node,
> +                                                "reg", 0);
> +                       if (phyaddr < 0) {
> +                               dev_err(dev, "could not find phy address\n");
> +                               return -1;
> +                       }
>                 }
>                 parent = fdt_parent_offset(gd->fdt_blob, phy_node);
>                 ret = uclass_get_device_by_of_offset(UCLASS_MDIO, parent,
> --
> 2.31.1
>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>