resource: Let dev_request_mem_region return an error pointer ...

For all users fix or add the error check.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: arc_emac: disable interrupts ...

The driver doesn't use interrupts and Linux driver crashes when emac
interrupts are enabled at boot: keep them disabled.

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: arc_emac: remove delay from mdio polling loop ...

Avoid unneeded delay when waiting for the completion of a mdio
operation and return as soon as possible.

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: Pass eth_device to net_receive ...

So that barebox has the information which interface a packet
came from.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: add ARC EMAC driver ...

This patch adds support for the Synopsys 10/100 Mbps Ethernet MAC used
on some ARC devices and on Rockchip SoCs.

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>