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dwc_eth_qos: Add Synopsys DWC Ethernet QoS bindings

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Add device tree binding documentation for the Synopsys DWC Ethernet
QoS driver supporting revision 4.10a of the hardware IP.

Signed-off-by: Lars Persson <larper@axis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lars Persson 2015-07-28 12:01:47 +02:00 committed by David S. Miller
parent 8c1a91f111
commit 5b8b64843a
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Documentation/devicetree/bindings/net/snps,dwc-qos-ethernet.txt Normal file
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* Synopsys DWC Ethernet QoS IP version 4.10 driver (GMAC)
Required properties:
- compatible: Should be "snps,dwc-qos-ethernet-4.10"
- reg: Address and length of the register set for the device
- clocks: Phandles to the reference clock and the bus clock
- clock-names: Should be "phy_ref_clk" for the reference clock and "apb_pclk"
for the bus clock.
- interrupt-parent: Should be the phandle for the interrupt controller
that services interrupts for this device
- interrupts: Should contain the core's combined interrupt signal
- phy-mode: See ethernet.txt file in the same directory
Optional properties:
- dma-coherent: Present if dma operations are coherent
- mac-address: See ethernet.txt in the same directory
- local-mac-address: See ethernet.txt in the same directory
- snps,en-lpi: If present it enables use of the AXI low-power interface
- snps,write-requests: Number of write requests that the AXI port can issue.
It depends on the SoC configuration.
- snps,read-requests: Number of read requests that the AXI port can issue.
It depends on the SoC configuration.
- snps,burst-map: Bitmap of allowed AXI burst lengts, with the LSB
representing 4, then 8 etc.
- snps,txpbl: DMA Programmable burst length for the TX DMA
- snps,rxpbl: DMA Programmable burst length for the RX DMA
- snps,en-tx-lpi-clockgating: Enable gating of the MAC TX clock during
TX low-power mode.
- phy-handle: See ethernet.txt file in the same directory
- mdio device tree subnode: When the GMAC has a phy connected to its local
mdio, there must be device tree subnode with the following
required properties:
- compatible: Must be "snps,dwc-qos-ethernet-mdio".
- #address-cells: Must be <1>.
- #size-cells: Must be <0>.
For each phy on the mdio bus, there must be a node with the following
fields:
- reg: phy id used to communicate to phy.
- device_type: Must be "ethernet-phy".
- fixed-mode device tree subnode: see fixed-link.txt in the same directory
Examples:
ethernet2@40010000 {
clock-names = "phy_ref_clk", "apb_pclk";
clocks = <&clkc 17>, <&clkc 15>;
compatible = "snps,dwc-qos-ethernet-4.10";
interrupt-parent = <&intc>;
interrupts = <0x0 0x1e 0x4>;
reg = <0x40010000 0x4000>;
phy-handle = <&phy2>;
phy-mode = "gmii";
snps,en-tx-lpi-clockgating;
snps,en-lpi;
snps,write-requests = <2>;
snps,read-requests = <16>;
snps,burst-map = <0x7>;
snps,txpbl = <8>;
snps,rxpbl = <2>;
dma-coherent;
mdio {
#address-cells = <0x1>;
#size-cells = <0x0>;
phy2: phy@1 {
compatible = "ethernet-phy-ieee802.3-c22";
device_type = "ethernet-phy";
reg = <0x1>;
};
};
};