Document the new xlnx,switch-x-sgmii attribute which is used to indicate
that the Ethernet core supports dynamic switching between 1000BaseX and
SGMII.

Signed-off-by: Robert Hancock <robert.hanc...@calian.com>
---
 Documentation/devicetree/bindings/net/xilinx_axienet.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/xilinx_axienet.txt 
b/Documentation/devicetree/bindings/net/xilinx_axienet.txt
index 7360617cdedb..2cd452419ed0 100644
--- a/Documentation/devicetree/bindings/net/xilinx_axienet.txt
+++ b/Documentation/devicetree/bindings/net/xilinx_axienet.txt
@@ -38,6 +38,10 @@ Optional properties:
                  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).
 - clocks       : AXI bus clock for the device. Refer to common clock bindings.
                  Used to calculate MDIO clock divisor. If not specified, it is
                  auto-detected from the CPU clock (but only on platforms where
-- 
2.27.0

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