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net: axienet: document axistream-connected attribute

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The axienet driver requires the use of an axistream-connected attribute,
but this isn't documented in the devicetree bindings. Document how this
attribute is supposed to be used, including the upcoming change to make
the usage of this attribute optional.

Signed-off-by: Robert Hancock <hancock@sedsystems.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Robert Hancock 2019-06-06 16:28:22 -06:00 committed by David S. Miller
parent 3b09a3fb35
commit a1765c1850
1 changed files with 15 additions and 4 deletions
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19
Documentation/devicetree/bindings/net/xilinx_axienet.txt
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@ -17,9 +17,15 @@ 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.
- 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.
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.
See ethernet.txt file in the same directory.
- xlnx,rxmem : Set to allocated memory buffer for Rx/Tx in the hardware
@ -37,6 +43,11 @@ Optional properties:
auto-detected from the CPU clock (but only on platforms where
this is possible). New device trees should specify this - the
auto detection is only for backward compatibility.
- 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).
@ -46,10 +57,10 @@ Example:
compatible = "xlnx,axi-ethernet-1.00.a";
device_type = "network";
interrupt-parent = <&microblaze_0_axi_intc>;
interrupts = <2 0>;
interrupts = <2 0 1>;
clocks = <&axi_clk>;
phy-mode = "mii";
reg = <0x40c00000 0x40000>;
reg = <0x40c00000 0x40000 0x50c00000 0x40000>;
xlnx,rxcsum = <0x2>;
xlnx,rxmem = <0x800>;
xlnx,txcsum = <0x2>;