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XILINX AXI ETHERNET Device Tree Bindings
--------------------------------------------------------
Also called AXI 1G/2.5G Ethernet Subsystem, the xilinx axi ethernet IP core
provides connectivity to an external ethernet PHY supporting different
interfaces: MII, GMII, RGMII, SGMII, 1000BaseX. It also includes two
segments of memory for buffering TX and RX, as well as the capability of
offloading TX/RX checksum calculation off the processor.
Management configuration is done through the AXI interface, while payload is
sent and received through means of an AXI DMA controller. This driver
includes the DMA driver code, so this driver is incompatible with AXI DMA
driver.
For more details about mdio please refer phy.txt file in the same directory.
Required properties:
- compatible : Must be one of "xlnx,axi-ethernet-1.00.a",
"xlnx,axi-ethernet-1.01.a", "xlnx,axi-ethernet-2.01.a"
- reg : Address and length of the IO space, as well as the address
and length of the AXI DMA controller IO space, unless
axistream-connected is specified, in which case the reg
attribute of the node referenced by it is used.
- interrupts : Should be a list of 2 or 3 interrupts: TX DMA, RX DMA,
and optionally Ethernet core. If axistream-connected is
specified, the TX/RX DMA interrupts should be on that node
instead, and only the Ethernet core interrupt is optionally
specified here.
- phy-handle : Should point to the external phy device if exists. Pointing
this to the PCS/PMA PHY is deprecated and should be avoided.
See ethernet.txt file in the same directory.
- xlnx,rxmem : Set to allocated memory buffer for Rx/Tx in the hardware
Optional properties:
- phy-mode : See ethernet.txt
- xlnx,phy-type : Deprecated, do not use, but still accepted in preference
to phy-mode.
- xlnx,txcsum : 0 or empty for disabling TX checksum offload,
1 to enable partial TX checksum offload,
2 to enable full TX checksum offload
- xlnx,rxcsum : Same values as xlnx,txcsum but for RX checksum offload
- xlnx,switch-x-sgmii : Boolean to indicate the Ethernet core is configured to
support both 1000BaseX and SGMII modes. If set, the phy-mode
should be set to match the mode selected on core reset (i.e.
by the basex_or_sgmii core input line).
- clock-names: Tuple listing input clock names. Possible clocks:
s_axi_lite_clk: Clock for AXI register slave interface
axis_clk: AXI4-Stream clock for TXD RXD TXC and RXS interfaces
ref_clk: Ethernet reference clock, used by signal delay
primitives and transceivers
mgt_clk: MGT reference clock (used by optional internal
PCS/PMA PHY)
Note that if s_axi_lite_clk is not specified by name, the
first clock of any name is used for this. If that is also not
specified, the clock rate is auto-detected from the CPU clock
(but only on platforms where this is possible). New device
trees should specify all applicable clocks by name - the
fallbacks to an unnamed clock or to CPU clock are only for
backward compatibility.
- clocks: Phandles to input clocks matching clock-names. Refer to common
clock bindings.
- axistream-connected: Reference to another node which contains the resources
for the AXI DMA controller used by this device.
If this is specified, the DMA-related resources from that
device (DMA registers and DMA TX/RX interrupts) rather
than this one will be used.
- mdio : Child node for MDIO bus. Must be defined if PHY access is
required through the core's MDIO interface (i.e. always,
unless the PHY is accessed through a different bus).
Non-standard MDIO bus frequency is supported via
"clock-frequency", see mdio.yaml.
- pcs-handle: Phandle to the internal PCS/PMA PHY in SGMII or 1000Base-X
modes, where "pcs-handle" should be used to point
to the PCS/PMA PHY, and "phy-handle" should point to an
external PHY if exists.
Example:
axi_ethernet_eth: ethernet@40c00000 {
compatible = "xlnx,axi-ethernet-1.00.a";
device_type = "network";
interrupt-parent = <µblaze_0_axi_intc>;
interrupts = <2 0 1>;
clock-names = "s_axi_lite_clk", "axis_clk", "ref_clk", "mgt_clk";
clocks = <&axi_clk>, <&axi_clk>, <&pl_enet_ref_clk>, <&mgt_clk>;
phy-mode = "mii";
reg = <0x40c00000 0x40000 0x50c00000 0x40000>;
xlnx,rxcsum = <0x2>;
xlnx,rxmem = <0x800>;
xlnx,txcsum = <0x2>;
phy-handle = <&phy0>;
axi_ethernetlite_0_mdio: mdio {
#address-cells = <1>;
#size-cells = <0>;
phy0: phy@0 {
device_type = "ethernet-phy";
reg = <1>;
};
};
};
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