[PATCH v1] net: sun8i-emac: Add support for fixed-link phy

[Maxim Kiselev]

вт, 16 янв. 2024 г. в 03:18, Andre Przywara <andre.przywara at arm.com>:
>
> On Thu, 15 Jun 2023 00:44:06 +0300
> Maxim Kiselev <bigunclemax at gmail.com> wrote:
>
> Hi Maxim,
>
> > From: Maksim Kiselev <bigunclemax at gmail.com>
> >
> > Based on dt-specs fixed-link doesn't require phy-handle to be used.
>
> Do you have such a board?

Yes, I had a custom board with T113 SoC which has fixed phy eth.

> And where is that written down? I don't see
> it explicitly mentioned as optional in ethernet-controller.yaml or in
> the DT spec PDF.

Sorry for that commit description. I just found the similar commit, that
fixes the same problem for zynq_gem
3888c8d1979289efe685fe29276aed4d4b685975 ("net: zynq_gem: Add support for
fixed-link phy") and copied the description from there.

> The sun8i EMAC binding lists phy-handle as required,
> so that would need to be relaxed there then.

Oh, indeed. So it will require to send dt-binding changes to Linux first...

Therefore, I think we can live without fixed-phy support for sun8i EMAC.
At least until some device with such a configuration appears on the
market :)

> > Fix driver to only read phy related setting when phy-handle is found.
>
> The patch itself looks fine, we already specify -1 as the default when
> the PHY DT node does not contain a reg property, so that looks like it
> would work.
>
> Cheers,
> Andre
>
> > Signed-off-by: Maksim Kiselev <bigunclemax at gmail.com>
> > ---
> >  drivers/net/sun8i_emac.c | 7 ++-----
> >  1 file changed, 2 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/net/sun8i_emac.c b/drivers/net/sun8i_emac.c
> > index 04c3274fbe..0e339d69e0 100644
> > --- a/drivers/net/sun8i_emac.c
> > +++ b/drivers/net/sun8i_emac.c
> > @@ -834,11 +834,8 @@ static int sun8i_emac_eth_of_to_plat(struct udevice *dev)
> >       priv->use_internal_phy = false;
> >
> >       offset = fdtdec_lookup_phandle(gd->fdt_blob, node, "phy-handle");
> > -     if (offset < 0) {
> > -             debug("%s: Cannot find PHY address\n", __func__);
> > -             return -EINVAL;
> > -     }
> > -     priv->phyaddr = fdtdec_get_int(gd->fdt_blob, offset, "reg", -1);
> > +     if (offset >= 0)
> > +             priv->phyaddr = fdtdec_get_int(gd->fdt_blob, offset, "reg", -1);
> >
> >       pdata->phy_interface = dev_read_phy_mode(dev);
> >       debug("phy interface %d\n", pdata->phy_interface);
>

Best wishes,
Maksim