[PATCH 2/3] mx7dsabre: Enable DM_ETH

[Fabio Estevam]

Hi Joris,

On Mon, Jan 27, 2020 at 1:16 PM Joris OFFOUGA <offougajoris at gmail.com> wrote:

> I can't find a fix yet.  If you find one it would be great.

I noticed that the Ethernet regression happens because the ENET_RST_B
signal keeps always at 0, which makes the PHY to never becomes active.

The Ethernet PHY reset comes from a GPIO expander (74LV595PW), which
is connected to SPI GPIO lines.

Both the GPIO expander driver (CONFIG_DM_74X164) as well as the SPI
GPIO driver (CONFIG_SOFT_SPI) are enabled at
configs/mx7dsabresd_defconfig.

The device tree has:

&fec1 {
....
phy-reset-gpios = <&extended_io 5 GPIO_ACTIVE_LOW>;

Port 5 of the 74LV595PW is the Ethernet PHY reset pin.

However, this is what we get in U-Boot:

Net:   Could not get PHY for FEC0: addr 0
No ethernet found.

Not sure why DM is not properly bringing the Ethernet PHY back to 1.

Any ideas?

Thanks