ethernet/arc/arc_emac - Add new driver

* Synopsys ARC EMAC 10/100 Ethernet driver (EMAC)

Required properties:

- compatible: Should be "snps,arc-emac"

- reg: Address and length of the register set for the device

- interrupts: Should contain the EMAC interrupts

- clock-frequency: CPU frequency. It is needed to calculate and set polling

period of EMAC.

- max-speed: Maximum supported data-rate in Mbit/s. In some HW configurations

bandwidth of external memory controller might be a limiting factor. That's why

it's required to specify which data-rate is supported on current SoC or FPGA.

For example if only 10 Mbit/s is supported (10BASE-T) set "10". If 100 Mbit/s is

supported (100BASE-TX) set "100".

- phy: PHY device attached to the EMAC via MDIO bus

Child nodes of the driver are the individual PHY devices connected to the

MDIO bus. They must have a "reg" property given the PHY address on the MDIO bus.

Optional properties:

- mac-address: 6 bytes, mac address

Examples:

	ethernet@c0fc2000 {

		compatible = "snps,arc-emac";

		reg = <0xc0fc2000 0x3c>;

		interrupts = <6>;

		mac-address = [ 00 11 22 33 44 55 ];

		clock-frequency = <80000000>;

		max-speed = <100>;

		phy = <&phy0>;

		#address-cells = <1>;

		#size-cells = <0>;

		phy0: ethernet-phy@0 {

			reg = <1>;

		};

	};

source "drivers/net/ethernet/alteon/Kconfig"

source "drivers/net/ethernet/amd/Kconfig"

source "drivers/net/ethernet/apple/Kconfig"

source "drivers/net/ethernet/arc/Kconfig"

source "drivers/net/ethernet/atheros/Kconfig"

source "drivers/net/ethernet/cadence/Kconfig"

source "drivers/net/ethernet/adi/Kconfig"

obj-$(CONFIG_NET_VENDOR_ALTEON) += alteon/

obj-$(CONFIG_NET_VENDOR_AMD) += amd/

obj-$(CONFIG_NET_VENDOR_APPLE) += apple/

obj-$(CONFIG_NET_VENDOR_ARC) += arc/

obj-$(CONFIG_NET_VENDOR_ATHEROS) += atheros/

obj-$(CONFIG_NET_CADENCE) += cadence/

obj-$(CONFIG_NET_BFIN) += adi/

#

# ARC EMAC network device configuration

#

config NET_VENDOR_ARC

	bool "ARC devices"

	default y

	---help---

	  If you have a network (Ethernet) card belonging to this class, say Y

	  and read the Ethernet-HOWTO, available from

	  <http://www.tldp.org/docs.html#howto>.

	  Note that the answer to this question doesn't directly affect the

	  kernel: saying N will just cause the configurator to skip all

	  the questions about ARC cards. If you say Y, you will be asked for

	  your specific card in the following questions.

if NET_VENDOR_ARC

config ARC_EMAC

	tristate "ARC EMAC support"

	select MII

	select PHYLIB

	depends on OF_IRQ

	depends on OF_NET

	---help---

	  On some legacy ARC (Synopsys) FPGA boards such as ARCAngel4/ML50x

	  non-standard on-chip ethernet device ARC EMAC 10/100 is used.

	  Say Y here if you have such a board.  If unsure, say N.

endif # NET_VENDOR_ARC

#

# Makefile for the ARC network device drivers.

#

arc_emac-objs := emac_main.o emac_mdio.o

obj-$(CONFIG_ARC_EMAC) += arc_emac.o