linux-kernel - Re: [PATCH 5/5] arm64: dts: meson: sei510: add network support

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Date:   Sat, 11 May 2019 19:16:16 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Kevin Hilman <khilman@...libre.com>
Cc:     Jerome Brunet <jbrunet@...libre.com>,
        linux-amlogic@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] arm64: dts: meson: sei510: add network support

Hi Kevin,

On Sat, May 11, 2019 at 12:45 AM Kevin Hilman <khilman@...libre.com> wrote:
>
> Jerome Brunet <jbrunet@...libre.com> writes:
>
> > Enable the network interface of the SEI510 which use the internal PHY.
> >
> > Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
>
> I tried testing this series on SEI510, but I must still be missing some
> defconfig options, as the default defconfig doesn't lead to a working
> interface.
>
>
> I tried adding this kconfig fragment[1], and the dwmac probes/inits but
> I must still be missing something, as the dwmac is still failing to find
> a PHY.  Boot log: https://termbin.com/ivf3
>
> I have the same result testing on the u200.
I wonder if we're simply missing the pinctrl definitions in the ethmac node:
  pinctrl-0 = <&eth_rmii_pins>;
  pinctrl-names = "default";

I don't know how the SoC works internally but I am assuming that the
MDIO pins are routed to the "internal PHY" (within the chip).
also we need the eth_rmii_pins anyways for the RXD/TXD pins which are
connected to the physical Ethernet port on the board.
bonus question: while writing this email I'm surprised to see that on
GXL we don't use the rmii pins anywhere, why is Ethernet working fine
there?


Martin