[PATCH] arm: kirkwood: Pogoplug V4 : Use Marvel network PHY driver

[Tony Dinh]

Hi Stefan,

On Tue, Jan 25, 2022 at 7:49 AM Stefan Roese <sr at denx.de> wrote:
>
> On 1/25/22 10:48, Tony Dinh wrote:
> > The Pogoplug V4 board has the network chip Marvell 88E1118R. So to
> > properly configure the network, enable CONFIG_PHY_MARVELL to activate
> > the driver M88E1118R.
> >
> > - This patch depends on the series:
> > https://patchwork.ozlabs.org/project/uboot/patch/20220124061712.28316-2-mibodhi@gmail.com/
> >
> > Signed-off-by: Tony Dinh <mibodhi at gmail.com>
>
> I was wondering, how all this "magically" works without the Marvell PHY
> driver being involved. ;) So:

I was wondering the same thing :) so I traced the mvgbe uclass code
calling sequence. It sets up the network in the same way for Marvell
network chips used in Kirkwood boards so the network was brought up
successfully. And it is because the driver .config hook falls back to
the genphy_config() in drivers/net/phy/phy.c. And there is enough
there for the network configuration. Hypothetically, if we encountered
an unknown chip, it still works in Gbit mode.

However, the specific settings such as RGMII and LED are done by the
driver .config and .startup hook if the Marvell PHY driver is enabled.

Initially, I thought if there is info in the DTS (or we could add
more), then this mvgbe uclass could do the work as the same as the
driver, too. But things such as phy-mode, speed, and duplex... must be
added to the DTS to make that happen. And it is counterproductive when
we already have the driver for that.

And thank you, Marek, and Pali for reviewing and critics. After many
years of absence from u-boot, I got up to speed again a lot easier
thanks to your comments!

Thanks,
Tony

> Reviewed-by: Stefan Roese <sr at denx.de>
>
> Thanks,
> Stefan
>
> > ---
> >
> >   configs/pogo_v4_defconfig | 1 +
> >   1 file changed, 1 insertion(+)
> >
> > diff --git a/configs/pogo_v4_defconfig b/configs/pogo_v4_defconfig
> > index 5490067b9e..1cf409c834 100644
> > --- a/configs/pogo_v4_defconfig
> > +++ b/configs/pogo_v4_defconfig
> > @@ -62,6 +62,7 @@ CONFIG_KIRKWOOD_GPIO=y
> >   CONFIG_MVEBU_MMC=y
> >   CONFIG_MTD=y
> >   CONFIG_MTD_RAW_NAND=y
> > +CONFIG_PHY_MARVELL=y
> >   CONFIG_DM_ETH=y
> >   CONFIG_MVGBE=y
> >   CONFIG_MII=y
>
> Viele Grüße,
> Stefan Roese
>
> --
> DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
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